Whipped cream is an example of [MNR 1978]

Dispersion medium Dispersed phase Gas Liquid

An isostere is [UPSEAT 1999]

\[NO_{2}^{-}\] and \[PO_{4}^{3-}\]

\[NO_{2}^{-}\] and \[{{O}_{3}}\]

\[NO_{2}^{-}\] and \[PO_{4}^{3-}\]

\[C{{O}_{2}},\,{{N}_{2}}O,\,NO_{3}^{-}\]

\[ClO_{4}^{-}\] and \[OC{{N}^{-}}\]

Which of the following represents correct order of conductivity in solids?

\[{{\kappa }_{\text{metals}}}>>{{\kappa }_{\text{insulators}}}

\[{{\kappa }_{\text{metals}}};{{\kappa }_{\text{semiconductors}}}

\[{{\kappa }_{\text{metals}}}{{\kappa }_{\text{insulators}}}\ne \text{zero}\]

Ferrous oxide has a cubic structure and each edge of the unit cell is \[5.0\text{ }{{A}^{o}}\]. Assuming density of the oxide as \[4.0\text{ }g\text{ }c{{m}^{-3}}\] the number of \[F{{e}^{2+}}\] and \[{{O}^{2-}}\] ions present in each unit cell will be

two \[F{{e}^{2+}}\] and four \[{{O}^{2-}}\]

three \[F{{e}^{2+}}\] and three \[{{O}^{2-}}\]

four \[F{{e}^{2+}}\] and two \[{{O}^{2-}}\]

four \[F{{e}^{2+}}\] and four \[{{O}^{2-}}\]

The inversion of cane sugar proceeds with half-life of 500 min at pH = 5 for any concentration of sugar. However, if pH = 6, the half-life changes to 50 min. The rate law expression for sugar inversion can be written as:

\[r=K{{\left[ sugar \right]}^{0}}{{\left[ {{H}^{+}} \right]}^{0}}\]

\[r=K{{\left[ sugar \right]}^{2}}{{\left[ {{H}^{+}} \right]}^{0}}\]

\[r=K{{\left[ sugar \right]}^{1}}{{\left[ {{H}^{+}} \right]}^{0}}\]

\[r=K{{\left[ sugar \right]}^{1}}{{\left[ {{H}^{+}} \right]}^{1}}\]

\[r=K{{\left[ sugar \right]}^{0}}{{\left[ {{H}^{+}} \right]}^{0}}\]

Given is the information: Reaction 1 : \[k=A{{e}^{-{{E}_{1}}/RT}}\] Reaction 2 : \[k'=A{{e}^{-{{E}_{2}}/RT}}\] If \[{{E}_{1}}=2{{E}_{2}},\] then the ratio \[\ell n\left[ \frac{{{k}_{T}}+10k}{{{k}_{T}}} \right]\] for the reaction will be

greater than that of reaction 2

may be greater or lesser than reaction 2 depending upon the temperature T.

Consider the following case of completing 1st order reactions. After the start of the reaction at t = 0 with only A, the [C] is equal to the [D] at all times. The time in which all three concentrations will be equal is given by -

\[t=\frac{1}{3{{k}_{1}}}\ell n2\]

\[t=\frac{1}{2{{k}_{1}}}\ell n3\]

\[t=\frac{1}{2{{k}_{2}}}\ell n\,3\]

\[t=\frac{1}{3{{k}_{1}}}\ell n2\]

In any unimolecular reaction

the molecularity of the reaction is one and order is zero

only one reacting species is involved in the rate determining step

the order and the molecularity of slowest step are equal to one

the molecularity of the reaction is one and order is zero

both molecularity and order of the reaction are one

Which of the following is required to neutralize 1 litre \[N-NaOH\]

1 \[l-0.5N-{{H}_{2}}S{{O}_{4}}\]

The Solvay process for making \[N{{a}_{2}}C{{O}_{3}}\] involves the reaction \[2NaHC{{O}_{3}}N{{a}_{2}}C{{O}_{3}}(s)+{{H}_{2}}O(g)+C{{O}_{2}}(g)\] For this reaction \[\Delta {{H}^{o}}=129.2\,kJ/mol,\] \[\Delta {{S}^{o}}=334.2\,J/mol-K\]. From this information, the minimum temperature at which this reaction becomes spontaneous is:

the reaction is spontaneous at all temperatures

If wavelength of photon is\[{{X}^{3-}}\]\[h=6.6\times {{10}^{-34}}\]J-sec, then momentum of photon is [MP PET 1999]

\[3.33\times {{10}^{22}}kg\,m{{s}^{-1}}\]

\[3\times {{10}^{-23}}kg\,m{{s}^{-1}}\]

\[3.33\times {{10}^{22}}kg\,m{{s}^{-1}}\]

\[1.452\times {{10}^{-44}}\,kg\,m{{s}^{-1}}\]

\[6.89\times {{10}^{43}}\,kg\,m{{s}^{-1}}\]

Among the following the pair in which the two species are not isostructural is [CBSE PMT 2004]

\[IO_{3}^{-}\] and \[Xe{{O}_{3}}\]

\[BH_{4}^{-}\] and \[NH_{4}^{+}\]

\[PF_{6}^{-}\]and \[S{{F}_{6}}\]

\[Si{{F}_{4}}\] and \[S{{F}_{4}}\]

\[IO_{3}^{-}\] and \[Xe{{O}_{3}}\]

The specific charge of proton is \[9.6\times {{10}^{6}}C\,k{{g}^{-1}}\] then for an a-particle it will be [MH CET 1999]

\[38.4\times {{10}^{7}}C\,k{{g}^{-1}}\]

\[19.2\times {{10}^{7}}C\,k{{g}^{-1}}\]

\[2.4\times {{10}^{7}}C\,k{{g}^{-1}}\]

\[4.8\times {{10}^{7}}C\,k{{g}^{-1}}\]

A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fireworks safety matches. The gas and halate respectively are

\[B{{r}_{2}},\,\,KBr{{O}_{3}}\]

\[C{{l}_{2}},\,\,KCl{{O}_{3}}\]

\[C{{l}_{2}},NaCl{{\text{O}}_{3}}\]

The correct representation for solubility product of \[Sn{{S}_{2}}\]is [CPMT 1977; MP PET 1999;RPMT 2000]

\[[S{{n}^{2+}}]\,\,{{[{{S}^{2-}}]}^{2}}\]

\[[S{{n}^{2+}}]\,\,[2{{S}^{2-}}]\]

\[[S{{n}^{4+}}]\,\,{{[2{{S}^{2-}}]}^{2}}\]

\[CaC{{l}_{2}}\] is preferred over \[NaCl\] for clearing ice on roads particularly in very cold countries. This is because:

\[NaCl\] makes the road slipperty but \[CaC{{l}_{2}}\] does not

\[CaC{{l}_{2}}\] is less soluble in \[{{H}_{2}}O\] than \[NaCl\]

\[CaC{{l}_{2}}\] is hygroscopic but \[NaCl\] is not

Eutectic mixture of \[CaC{{l}_{2}}/{{H}_{2}}O\] freezes at \[-55{}^\circ C\] while that of \[NaCl/{{H}_{2}}O\] freezes at \[-18{}^\circ C\]

\[NaCl\] makes the road slipperty but \[CaC{{l}_{2}}\] does not

A decomposes as The rate of disappearance of B, taking 4M concentration of A is equal to

\[1.6\times {{10}^{-3}}M{{s}^{-1}}\]

\[6.4\times {{10}^{-3}}M{{s}^{-1}}\]

\[3.2\times {{10}^{-3}}M{{s}^{-1}}\]

11242 + Mcqs in Chemistry in Joint Entrance Exam - Main (JEE Main) Page 4 McqOptions

151.	Whipped cream is an example of [MNR 1978]
A.	Dispersion medium Dispersed phase Gas Liquid
B.	Liquid Gas
C.	Liquid Liquid
D.	Liquid Solid
Answer» C. Liquid Liquid

Discussion

152.	An isostere is [UPSEAT 1999]
A.	\[NO_{2}^{-}\] and \[{{O}_{3}}\]
B.	\[NO_{2}^{-}\] and \[PO_{4}^{3-}\]
C.	\[C{{O}_{2}},\,{{N}_{2}}O,\,NO_{3}^{-}\]
D.	\[ClO_{4}^{-}\] and \[OC{{N}^{-}}\]
Answer» B. \[NO_{2}^{-}\] and \[PO_{4}^{3-}\]

Discussion

153.	Which of the following represents correct order of conductivity in solids?
A.	\[{{\kappa }_{\text{metals}}}>>{{\kappa }_{\text{insulators}}}<{{\kappa }_{\text{semiconductors}}}\]
B.	\[{{\kappa }_{\text{metals}}}<<{{\kappa }_{\text{insulators}}}<{{\kappa }_{\text{semiconductors}}}\]
C.	\[{{\kappa }_{\text{metals}}};{{\kappa }_{\text{semiconductors}}}<{{\kappa }_{\text{insulators}}}=\text{zero}\]
D.	\[{{\kappa }_{\text{metals}}}<{{\kappa }_{\text{semiconductors}}}>{{\kappa }_{\text{insulators}}}\ne \text{zero}\]
Answer» B. \[{{\kappa }_{\text{metals}}}<<{{\kappa }_{\text{insulators}}}<{{\kappa }_{\text{semiconductors}}}\]

Discussion

154.	Match the type of packing given in Column-I with the items given in Column-II.Column-IColumn-II[a] Square close packing two dimensions(1) Triangular voids[b] Hexagonal close packing in two dimensions(2) Pattern of sphere is repeated in every fourth layer.[c] Hexagonal close packing in three dimensions(3) Coordination number 4[d] Cubic close packing in three dimensions(4) Pattern of sphere is repeated in alternate layers.
A.	A-3, B-1, C-4, D-2
B.	A-1, B-2, C-3, D-4
C.	A-3, B-2, C-1, D-4
D.	A-4, B-3, C-2, D-1
Answer» B. A-1, B-2, C-3, D-4

Discussion

155.	Ferrous oxide has a cubic structure and each edge of the unit cell is \[5.0\text{ }{{A}^{o}}\]. Assuming density of the oxide as \[4.0\text{ }g\text{ }c{{m}^{-3}}\] the number of \[F{{e}^{2+}}\] and \[{{O}^{2-}}\] ions present in each unit cell will be
A.	two \[F{{e}^{2+}}\] and four \[{{O}^{2-}}\]
B.	three \[F{{e}^{2+}}\] and three \[{{O}^{2-}}\]
C.	four \[F{{e}^{2+}}\] and two \[{{O}^{2-}}\]
D.	four \[F{{e}^{2+}}\] and four \[{{O}^{2-}}\]
Answer» E.

Discussion

156.	A current of 2.0 A when passed for 5 hours through a molten metal salt deposits 22.2 g of metal of atomic weight 177. The oxidation state of the metal in the metal salt is
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

157.	A current of 0.250 A is passed through 400 mL of a 2, 0 M solution of NaCl for 35 minutes. What will be the pH of the solution after the current is turned off?
A.	12.98
B.	12.13
C.	10.48
D.	9.24
Answer» C. 10.48

Discussion

158.	Acidulated water is electrolysed by 1 A current for 16 min and 5s using inert electrodes, The volume of gases liberated at STP will be
A.	22.4 mL
B.	112 mL
C.	168 mL
D.	336 mL
Answer» D. 336 mL

Discussion

159.	The inversion of cane sugar proceeds with half-life of 500 min at pH = 5 for any concentration of sugar. However, if pH = 6, the half-life changes to 50 min. The rate law expression for sugar inversion can be written as:
A.	\[r=K{{\left[ sugar \right]}^{2}}{{\left[ {{H}^{+}} \right]}^{0}}\]
B.	\[r=K{{\left[ sugar \right]}^{1}}{{\left[ {{H}^{+}} \right]}^{0}}\]
C.	\[r=K{{\left[ sugar \right]}^{1}}{{\left[ {{H}^{+}} \right]}^{1}}\]
D.	\[r=K{{\left[ sugar \right]}^{0}}{{\left[ {{H}^{+}} \right]}^{0}}\]
Answer» D. \[r=K{{\left[ sugar \right]}^{0}}{{\left[ {{H}^{+}} \right]}^{0}}\]

Discussion

160.	Given is the information: Reaction 1 : \[k=A{{e}^{-{{E}_{1}}/RT}}\] Reaction 2 : \[k'=A{{e}^{-{{E}_{2}}/RT}}\] If \[{{E}_{1}}=2{{E}_{2}},\] then the ratio \[\ell n\left[ \frac{{{k}_{T}}+10k}{{{k}_{T}}} \right]\] for the reaction will be
A.	Equal to that of reaction 2
B.	greater than that of reaction 2
C.	lesser than that of reaction 2
D.	may be greater or lesser than reaction 2 depending upon the temperature T.
Answer» C. lesser than that of reaction 2

Discussion

161.	Consider the following case of completing 1st order reactions. After the start of the reaction at t = 0 with only A, the [C] is equal to the [D] at all times. The time in which all three concentrations will be equal is given by -
A.	\[t=\frac{1}{2{{k}_{1}}}\ell n3\]
B.	\[t=\frac{1}{2{{k}_{2}}}\ell n\,3\]
C.	\[t=\frac{1}{3{{k}_{1}}}\ell n2\]
D.	\[t=\frac{1}{3{{k}_{1}}}\ell n2\]
Answer» C. \[t=\frac{1}{3{{k}_{1}}}\ell n2\]

Discussion

162.	In any unimolecular reaction
A.	only one reacting species is involved in the rate determining step
B.	the order and the molecularity of slowest step are equal to one
C.	the molecularity of the reaction is one and order is zero
D.	both molecularity and order of the reaction are one
Answer» C. the molecularity of the reaction is one and order is zero

Discussion

163.	In neutralisation of KI by \[AgN{{O}_{3}}\] positive charge is due to absorption of [AMU 2000]
A.	\[A{{g}^{+}}\] ions
B.	Ag
C.	I ions
D.	Both B and C
Answer» B. Ag

Discussion

164.	Which colourless gas evolves, when \[N{{H}_{4}}Cl\] reacts with zinc in a dry cell battery [Orissa JEE 2003]
A.	\[N{{H}_{4}}\]
B.	\[{{N}_{2}}\]
C.	\[{{H}_{2}}\]
D.	\[C{{l}_{2}}\]
Answer» D. \[C{{l}_{2}}\]

Discussion

165.	Calculate the velocity of ejected electron from the metal surface when light of frequency \[2\times {{10}^{15}}Hz\] fall on the metal surface and the threshold frequency is \[~7\times {{10}^{14}}Hz\] for metal?
A.	\[~1.37\times {{10}^{6}}\]
B.	\[~1.26\times {{10}^{6}}\]
C.	\[1.45\times {{10}^{7}}\]
D.	\[~1.37 \times {{10}^{7}}\]
Answer» B. \[~1.26\times {{10}^{6}}\]

Discussion

166.	A solid element (symbol Y) conducts electricity and forms two chlorides \[YC{{l}_{n}}\] (colourless volatile liquid) and \[YC{{l}_{n-2}}\] (a colourless solid). To which one of the following groups of the periodic table does Y belong?
A.	13
B.	14
C.	15
D.	16
Answer» C. 15

Discussion

167.	Which of the following compounds which is an optically active compound [UPSEAT 1999]
A.	1-butanol
B.	2-butanol
C.	3-butanol
D.	4-heptanol
Answer» C. 3-butanol

Discussion

168.	d-tartaric acid and l-tartaric acid are [MH CET 1999]
A.	Enantiomers
B.	Tautomers
C.	Diastereoisomers
D.	Structural isomers
Answer» B. Tautomers

Discussion

169.	Cone. \[HN{{O}_{3}}\] is heated with \[{{P}_{2}}{{O}_{5}}\] to form:
A.	\[N{{O}_{2}}\]
B.	NO
C.	\[{{N}_{2}}{{O}_{^{5}}}\]
D.	\[{{N}_{2}}O\]
Answer» D. \[{{N}_{2}}O\]

Discussion

170.	Which of the following is required to neutralize 1 litre \[N-NaOH\]
A.	1 \[l-N-{{H}_{2}}S{{O}_{4}}\]
B.	1 \[l-M-{{H}_{2}}S{{O}_{4}}\]
C.	1 \[l-2N-{{H}_{2}}S{{O}_{4}}\]
D.	1 \[l-0.5N-{{H}_{2}}S{{O}_{4}}\]
Answer» E.

Discussion

171.	Alcoholic fermentation is brought about by the action of [CPMT 1977, 79, 88; DPMT 1983]
A.	\[C{{O}_{2}}\]
B.	\[{{O}_{2}}\]
C.	Invertase
D.	Yeast
Answer» E.

Discussion

172.	For an endothermic reaction, where \[\Delta H\] represents the enthalpy of the reaction, the minimum value for the energy of activation will be
A.	less than \[\Delta H\]
B.	zero
C.	more than \[\Delta H\]
D.	equal to \[\Delta H\]
Answer» D. equal to \[\Delta H\]

Discussion

173.	Given the following standard enthalpies of formation, which elements will react exothermically with \[Si{{O}_{2}}(s)\] to make Si(s)? Compounds \[\Delta H_{f}^{o}kJ/mol\] \[Si{{O}_{2}}(s)\] - 910 \[MgO(s)\] - 601 \[C{{r}_{2}}{{O}_{3}}(s)\] - 1128 \[C{{O}_{2}}(g)\] - 393 \[L{{i}_{2}}O(s)\] - 598
A.	Cr only
B.	Mg and Li only
C.	C, Li and Cr
D.	Li only
Answer» C. C, Li and Cr

Discussion

174.	The Solvay process for making \[N{{a}_{2}}C{{O}_{3}}\] involves the reaction \[2NaHC{{O}_{3}}N{{a}_{2}}C{{O}_{3}}(s)+{{H}_{2}}O(g)+C{{O}_{2}}(g)\] For this reaction \[\Delta {{H}^{o}}=129.2\,kJ/mol,\] \[\Delta {{S}^{o}}=334.2\,J/mol-K\]. From this information, the minimum temperature at which this reaction becomes spontaneous is:
A.	\[460{}^\circ C\]
B.	\[1017{}^\circ C\]
C.	\[113{}^\circ C\]
D.	the reaction is spontaneous at all temperatures
Answer» D. the reaction is spontaneous at all temperatures

Discussion

175.	When 2.5 g of a. sample of Mohr's salt reacts N completely with 50 mL of \[\frac{N}{10}KMn{{O}_{4}}\] solution. The % purity of the sample of Mohr's salt is:
A.	78.4
B.	70
C.	37
D.	40
Answer» B. 70

Discussion

176.	Addition of \[SnC{{l}_{2}}\] to \[HgC{{l}_{2}}\] gives ppt [BVP 2003]
A.	White turning to red
B.	White turning to gray
C.	Black turning to white
D.	None of these
Answer» C. Black turning to white

Discussion

177.	If wavelength of photon is\[{{X}^{3-}}\]\[h=6.6\times {{10}^{-34}}\]J-sec, then momentum of photon is [MP PET 1999]
A.	\[3\times {{10}^{-23}}kg\,m{{s}^{-1}}\]
B.	\[3.33\times {{10}^{22}}kg\,m{{s}^{-1}}\]
C.	\[1.452\times {{10}^{-44}}\,kg\,m{{s}^{-1}}\]
D.	\[6.89\times {{10}^{43}}\,kg\,m{{s}^{-1}}\]
Answer» B. \[3.33\times {{10}^{22}}kg\,m{{s}^{-1}}\]

Discussion

178.	81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is
A.	81.398 g
B.	71.40 g
C.	91.4 g
D.	81 g
Answer» B. 71.40 g

Discussion

179.	Among the following the pair in which the two species are not isostructural is [CBSE PMT 2004]
A.	\[BH_{4}^{-}\] and \[NH_{4}^{+}\]
B.	\[PF_{6}^{-}\]and \[S{{F}_{6}}\]
C.	\[Si{{F}_{4}}\] and \[S{{F}_{4}}\]
D.	\[IO_{3}^{-}\] and \[Xe{{O}_{3}}\]
Answer» D. \[IO_{3}^{-}\] and \[Xe{{O}_{3}}\]

Discussion

180.	The specific charge of proton is \[9.6\times {{10}^{6}}C\,k{{g}^{-1}}\] then for an a-particle it will be [MH CET 1999]
A.	\[38.4\times {{10}^{7}}C\,k{{g}^{-1}}\]
B.	\[19.2\times {{10}^{7}}C\,k{{g}^{-1}}\]
C.	\[2.4\times {{10}^{7}}C\,k{{g}^{-1}}\]
D.	\[4.8\times {{10}^{7}}C\,k{{g}^{-1}}\]
Answer» E.

Discussion

181.	If 30 ml of \[{{H}_{2}}\] and 20 ml of \[{{O}_{2}}\]reacts to form water, what is left at the end of the reaction [AFMC 2005]
A.	10ml of \[{{H}_{2}}\]
B.	5ml of \[{{H}_{2}}\]
C.	10ml of \[{{O}_{2}}\]
D.	5ml of \[{{O}_{2}}\]
Answer» E.

Discussion

182.	How many grams of \[CaO\] are required to neutralize 852 g of \[{{P}_{4}}{{O}_{10}}\]?
A.	1008 g
B.	108 g
C.	1800 g
D.	3600 g
Answer» B. 108 g

Discussion

183.	A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fireworks safety matches. The gas and halate respectively are
A.	\[B{{r}_{2}},\,\,KBr{{O}_{3}}\]
B.	\[C{{l}_{2}},\,\,KCl{{O}_{3}}\]
C.	\[{{I}_{2}},NaI{{O}_{3}}\]
D.	\[C{{l}_{2}},NaCl{{\text{O}}_{3}}\]
Answer» C. \[{{I}_{2}},NaI{{O}_{3}}\]

Discussion

184.	If in Bohr's model, for unielectronic atom, time period of revolution is represented as \[{{T}_{n,z}}\] where n represents shell no. and Z represents atomic number then the value of\[{{T}_{1,2}}:{{T}_{2,1}}\], will be:
A.	8 : 1
B.	0.0472222222222222
C.	1 : 1
D.	0.0638888888888889
Answer» E.

Discussion

185.	Ammonia gas dissolves in water to give \[N{{H}_{4}}OH.\] In this reaction water acts as [CPMT 1990; MP PMT 1990]
A.	An acid
B.	A base
C.	A salt
D.	A conjugate base
Answer» B. A base

Discussion

186.	The correct representation for solubility product of \[Sn{{S}_{2}}\]is [CPMT 1977; MP PET 1999;RPMT 2000]
A.	\[3\times {{10}^{-2}}\,M\]
B.	\[[S{{n}^{2+}}]\,\,{{[{{S}^{2-}}]}^{2}}\]
C.	\[[S{{n}^{2+}}]\,\,[2{{S}^{2-}}]\]
D.	\[[S{{n}^{4+}}]\,\,{{[2{{S}^{2-}}]}^{2}}\]
Answer» B. \[[S{{n}^{2+}}]\,\,{{[{{S}^{2-}}]}^{2}}\]

Discussion

187.	\[CaC{{l}_{2}}\] is preferred over \[NaCl\] for clearing ice on roads particularly in very cold countries. This is because:
A.	\[CaC{{l}_{2}}\] is less soluble in \[{{H}_{2}}O\] than \[NaCl\]
B.	\[CaC{{l}_{2}}\] is hygroscopic but \[NaCl\] is not
C.	Eutectic mixture of \[CaC{{l}_{2}}/{{H}_{2}}O\] freezes at \[-55{}^\circ C\] while that of \[NaCl/{{H}_{2}}O\] freezes at \[-18{}^\circ C\]
D.	\[NaCl\] makes the road slipperty but \[CaC{{l}_{2}}\] does not
Answer» D. \[NaCl\] makes the road slipperty but \[CaC{{l}_{2}}\] does not

Discussion

188.	The property by virtue of which a compound can turn the plane polarised light is known as [BHU 1979]
A.	Photolysis
B.	Phosphorescence
C.	Optical activity
D.	Polarization
Answer» D. Polarization

Discussion

189.	Which of the following oxides is most basic [MP PET 1994]
A.	\[N{{a}_{2}}O\]
B.	\[A{{l}_{2}}{{O}_{3}}\]
C.	\[Si{{O}_{2}}\]
D.	\[S{{O}_{2}}\]
Answer» B. \[A{{l}_{2}}{{O}_{3}}\]

Discussion

190.	The volume of concentrated sulphuric acid which is 98% by mass (density \[=1.84\,g\,c{{m}^{-3}}\]) required to prepare \[5\,d{{m}^{3}}\] of \[0.5\text{ }mol\text{ }d{{m}^{-3}}\] solution of sulphuric acid is
A.	272 mL
B.	68 mL
C.	136 mL
D.	204 mL
Answer» D. 204 mL

Discussion

191.	What is the maximum number of electrons in an atom that can have quantum numbers \[n=4\,{{m}_{e}}=+1\]
A.	4
B.	15
C.	3
D.	6
Answer» E.

Discussion

192.	Nitrogen dioxide cannot be prepared by heating
A.	\[KN{{O}_{3}}\]
B.	\[Pb{{(N{{O}_{3}})}_{2}}\]
C.	\[Cu{{(N{{O}_{3}})}_{2}}\]
D.	\[AgN{{O}_{3}}\]
Answer» B. \[Pb{{(N{{O}_{3}})}_{2}}\]

Discussion

193.	The wave number of first line of Balmer series of hydrogen is \[15200\,c{{m}^{-1}}\]. The wave number of first Balmer line of \[L{{i}^{2+}}\] ion is
A.	\[15200\,c{{m}^{-1}}\]
B.	\[60800\,c{{m}^{-1}}\]
C.	\[76000\,c{{m}^{-1}}\]
D.	\[136800\,c{{m}^{-1}}\]
Answer» E.

Discussion

194.	The acid catalyzed hydrolysis of an organic, compound 'A' at \[30{}^\circ C\] has a time for half change of 100 minute when carried out in a buffer solution at \[(pH=5)\] and 10 minute when carried out at \[(pH=4)\]. Both times of half change are independent of the initial concentration of A. If rate constant K is defined by \[\frac{-d[A]}{dt}=K{{[A]}^{a}}{{[{{H}^{+}}]}^{b}},\] the values of a and b respectively are
A.	1, 1
B.	1, 2
C.	0, 1
D.	1, 0
Answer» B. 1, 2

Discussion

195.	The surface tension of which of the following liquid is maximum ? [CBSE PMT 2005]
A.	\[{{H}_{2}}O\]
B.	\[{{C}_{6}}{{H}_{6}}\]
C.	\[C{{H}_{3}}OH\]
D.	\[{{C}_{2}}{{H}_{5}}OH\]
Answer» B. \[{{C}_{6}}{{H}_{6}}\]

Discussion

196.	A decomposes as The rate of disappearance of B, taking 4M concentration of A is equal to
A.	\[1.6\times {{10}^{-3}}M{{s}^{-1}}\]
B.	\[6.4\times {{10}^{-3}}M{{s}^{-1}}\]
C.	\[3.2\times {{10}^{-3}}M{{s}^{-1}}\]
D.	insufficient to calculate
Answer» D. insufficient to calculate

Discussion

197.	What is the molarity of \[SO_{4}^{2-}\] ion in aqueous solution that contain 34.2 ppm of \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]? (Assume complete dissociation and density of solution 1 g/mL)
A.	\[3\times {{10}^{-4}}M\]
B.	\[2\times {{10}^{-4}}M\]
C.	\[{{10}^{-4}}M\]
D.	None of these
Answer» B. \[2\times {{10}^{-4}}M\]

Discussion

198.	A reagent that can distinguish between a chloride and a peroxide is [EAMCET 1976]
A.	Water
B.	Dil. \[{{H}_{2}}S{{O}_{4}}\]
C.	\[KOH\] solution
D.	\[NaCl\]
Answer» C. \[KOH\] solution

Discussion

199.	The molecular weight of a tribasic acid is M. What will be its equivalent weight [CPMT 1974, 79; MP PMT 2003]
A.	\[\frac{M}{2}\]
B.	M
C.	\[\frac{M}{3}\]
D.	\[\sqrt{\frac{M}{3}}\]
Answer» D. \[\sqrt{\frac{M}{3}}\]

Discussion

200.	The number of possible isomers of the compound with molecular formula \[{{C}_{7}}{{H}_{8}}O\] is [BHU 2001]
A.	3
B.	5
C.	7
D.	9
Answer» E.

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

Whipped cream is an example of [MNR 1978]

An isostere is [UPSEAT 1999]

Which of the following represents correct order of conductivity in solids?

Ferrous oxide has a cubic structure and each edge of the unit cell is \[5.0\text{ }{{A}^{o}}\]. Assuming density of the oxide as \[4.0\text{ }g\text{ }c{{m}^{-3}}\] the number of \[F{{e}^{2+}}\] and \[{{O}^{2-}}\] ions present in each unit cell will be

A current of 2.0 A when passed for 5 hours through a molten metal salt deposits 22.2 g of metal of atomic weight 177. The oxidation state of the metal in the metal salt is

A current of 0.250 A is passed through 400 mL of a 2, 0 M solution of NaCl for 35 minutes. What will be the pH of the solution after the current is turned off?

Acidulated water is electrolysed by 1 A current for 16 min and 5s using inert electrodes, The volume of gases liberated at STP will be

The inversion of cane sugar proceeds with half-life of 500 min at pH = 5 for any concentration of sugar. However, if pH = 6, the half-life changes to 50 min. The rate law expression for sugar inversion can be written as:

Given is the information: Reaction 1 : \[k=A{{e}^{-{{E}_{1}}/RT}}\] Reaction 2 : \[k'=A{{e}^{-{{E}_{2}}/RT}}\] If \[{{E}_{1}}=2{{E}_{2}},\] then the ratio \[\ell n\left[ \frac{{{k}_{T}}+10k}{{{k}_{T}}} \right]\] for the reaction will be

Consider the following case of completing 1st order reactions. After the start of the reaction at t = 0 with only A, the [C] is equal to the [D] at all times. The time in which all three concentrations will be equal is given by -

In any unimolecular reaction

In neutralisation of KI by \[AgN{{O}_{3}}\] positive charge is due to absorption of [AMU 2000]

Which colourless gas evolves, when \[N{{H}_{4}}Cl\] reacts with zinc in a dry cell battery [Orissa JEE 2003]

Calculate the velocity of ejected electron from the metal surface when light of frequency \[2\times {{10}^{15}}Hz\] fall on the metal surface and the threshold frequency is \[~7\times {{10}^{14}}Hz\] for metal?

A solid element (symbol Y) conducts electricity and forms two chlorides \[YC{{l}_{n}}\] (colourless volatile liquid) and \[YC{{l}_{n-2}}\] (a colourless solid). To which one of the following groups of the periodic table does Y belong?

Which of the following compounds which is an optically active compound [UPSEAT 1999]

d-tartaric acid and l-tartaric acid are [MH CET 1999]

Cone. \[HN{{O}_{3}}\] is heated with \[{{P}_{2}}{{O}_{5}}\] to form:

Which of the following is required to neutralize 1 litre \[N-NaOH\]

Alcoholic fermentation is brought about by the action of [CPMT 1977, 79, 88; DPMT 1983]

For an endothermic reaction, where \[\Delta H\] represents the enthalpy of the reaction, the minimum value for the energy of activation will be

Given the following standard enthalpies of formation, which elements will react exothermically with \[Si{{O}_{2}}(s)\] to make Si(s)? Compounds \[\Delta H_{f}^{o}kJ/mol\] \[Si{{O}_{2}}(s)\] - 910 \[MgO(s)\] - 601 \[C{{r}_{2}}{{O}_{3}}(s)\] - 1128 \[C{{O}_{2}}(g)\] - 393 \[L{{i}_{2}}O(s)\] - 598

When 2.5 g of a. sample of Mohr's salt reacts N completely with 50 mL of \[\frac{N}{10}KMn{{O}_{4}}\] solution. The % purity of the sample of Mohr's salt is:

Addition of \[SnC{{l}_{2}}\] to \[HgC{{l}_{2}}\] gives ppt [BVP 2003]

If wavelength of photon is\[{{X}^{3-}}\]\[h=6.6\times {{10}^{-34}}\]J-sec, then momentum of photon is [MP PET 1999]

81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is

Among the following the pair in which the two species are not isostructural is [CBSE PMT 2004]

The specific charge of proton is \[9.6\times {{10}^{6}}C\,k{{g}^{-1}}\] then for an a-particle it will be [MH CET 1999]

If 30 ml of \[{{H}_{2}}\] and 20 ml of \[{{O}_{2}}\]reacts to form water, what is left at the end of the reaction [AFMC 2005]

How many grams of \[CaO\] are required to neutralize 852 g of \[{{P}_{4}}{{O}_{10}}\]?

A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fireworks safety matches. The gas and halate respectively are

If in Bohr's model, for unielectronic atom, time period of revolution is represented as \[{{T}_{n,z}}\] where n represents shell no. and Z represents atomic number then the value of\[{{T}_{1,2}}:{{T}_{2,1}}\], will be:

Ammonia gas dissolves in water to give \[N{{H}_{4}}OH.\] In this reaction water acts as [CPMT 1990; MP PMT 1990]

The correct representation for solubility product of \[Sn{{S}_{2}}\]is [CPMT 1977; MP PET 1999;RPMT 2000]

\[CaC{{l}_{2}}\] is preferred over \[NaCl\] for clearing ice on roads particularly in very cold countries. This is because:

The property by virtue of which a compound can turn the plane polarised light is known as [BHU 1979]

Which of the following oxides is most basic [MP PET 1994]

The volume of concentrated sulphuric acid which is 98% by mass (density \[=1.84\,g\,c{{m}^{-3}}\]) required to prepare \[5\,d{{m}^{3}}\] of \[0.5\text{ }mol\text{ }d{{m}^{-3}}\] solution of sulphuric acid is

What is the maximum number of electrons in an atom that can have quantum numbers \[n=4\,{{m}_{e}}=+1\]

Nitrogen dioxide cannot be prepared by heating

The wave number of first line of Balmer series of hydrogen is \[15200\,c{{m}^{-1}}\]. The wave number of first Balmer line of \[L{{i}^{2+}}\] ion is

The surface tension of which of the following liquid is maximum ? [CBSE PMT 2005]

A decomposes as The rate of disappearance of B, taking 4M concentration of A is equal to

What is the molarity of \[SO_{4}^{2-}\] ion in aqueous solution that contain 34.2 ppm of \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]? (Assume complete dissociation and density of solution 1 g/mL)

A reagent that can distinguish between a chloride and a peroxide is [EAMCET 1976]

The molecular weight of a tribasic acid is M. What will be its equivalent weight [CPMT 1974, 79; MP PMT 2003]

The number of possible isomers of the compound with molecular formula \[{{C}_{7}}{{H}_{8}}O\] is [BHU 2001]