11242 + Mcqs in Chemistry Page 169 McqOptions

8401.	Copper sulphate is commercially made from copper scraps by [CPMT 1973]
A.	Dissolving in hot conc. \[{{H}_{2}}S{{O}_{4}}\]
B.	The action of dil. \[{{H}_{2}}S{{O}_{4}}\] and air
C.	Heating with sodium sulphate
D.	Heating with sulphur
Answer» C. Heating with sodium sulphate

Discussion

8402.	Which of the following statements about a catalyst is true [AIIMS 1996]
A.	It lowers the energy of activation
B.	The catalyst altered during the reaction is regenerated
C.	It does not alter the equilibrium
D.	All of these
Answer» E.

Discussion

8403.	The frequency of radiation emitted when the electron falls from \[n=4\] to \[n=1\] in a hydrogen atom will be (Given ionization energy of H\[=2.18\times {{10}^{-18}}J\,\,\,\text{ato}{{\text{m}}^{-1}}\]and \[h=6.625\times {{10}^{-34}}Js\]) [CBSE PMT 2004]
A.	\[3.08\times {{10}^{15}}{{s}^{-1}}\]
B.	\[2.00\times {{10}^{15}}{{s}^{-1}}\]
C.	\[1.54\times {{10}^{15}}{{s}^{-1}}\]
D.	\[1.03\times {{10}^{15}}{{s}^{-1}}\]
Answer» B. \[2.00\times {{10}^{15}}{{s}^{-1}}\]

Discussion

8404.	For the reduction of ketones to hydrocarbon, the appropriate agent is [DPMT 2002]
A.	\[HI\]
B.	\[Zn-Hg/HCl\]
C.	Red phosphorous
D.	\[{{H}_{2}}S{{O}_{4}}\]
Answer» C. Red phosphorous

Discussion

8405.	Methyl group attached to benzene can be oxidised to carboxyl group by reacting with [KCET 1993]
A.	\[F{{e}_{2}}{{O}_{3}}\]
B.	\[AgN{{O}_{3}}\]
C.	\[KMn{{O}_{4}}\]
D.	\[C{{r}_{2}}{{O}_{3}}\]
Answer» D. \[C{{r}_{2}}{{O}_{3}}\]

Discussion

8406.	Which of the anhydrous salts when come in contact with water turns blue [AMU 1981, 82]
A.	Ferrous sulphate
B.	Copper sulphate
C.	Zinc sulphate
D.	Cobalt sulphate
Answer» C. Zinc sulphate

Discussion

8407.	A solution of \[FeC{{l}_{3}}\] in water acts as acidic due to [BVP 2003]
A.	Hydrolysis of \[F{{e}^{3+}}\]
B.	Acidic impurities
C.	Dissociation
D.	Ionisation
Answer» B. Acidic impurities

Discussion

8408.	The equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] in acidic medium
A.	294
B.	298
C.	49
D.	50
Answer» D. 50

Discussion

8409.	Halogenation of alkanes is an example of [MP PET 1993; KCET 1998]
A.	Electrophilic substitution
B.	Nucleophilic substitution
C.	Free-radical substitution
D.	Oxidation
Answer» D. Oxidation

Discussion

8410.	A white salt is readily soluble in water and gives a colourless solution with a \[pH\]of about 9. The salt would be [Pb. PMT 1998]
A.	\[N{{H}_{4}}N{{O}_{3}}\]
B.	\[C{{H}_{3}}COONa\]
C.	\[C{{H}_{3}}COON{{H}_{4}}\]
D.	\[CaC{{O}_{3}}\]
Answer» C. \[C{{H}_{3}}COON{{H}_{4}}\]

Discussion

8411.	Ferrous sulphate on strong heating gives
A.	\[S{{O}_{2}}\]
B.	\[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\]
C.	\[FeO+S{{O}_{3}}\]
D.	\[F{{e}_{2}}{{O}_{3}}+S{{O}_{2}}+S{{O}_{3}}\]
Answer» E.

Discussion

8412.	Which one of the following properties of colloids is related with scattering of light [MP PMT 1989]
A.	Diffusion
B.	Peptization
C.	Tyndall effect
D.	Brownian movement
Answer» D. Brownian movement

Discussion

8413.	In the process \[BC{{l}_{3}}+P{{H}_{3}}\to BC{{l}_{3}}:P{{H}_{3}}\] The Lewis acid is [RPMT 2000]
A.	\[P{{H}_{3}}\]
B.	\[BC{{l}_{3}}\]
C.	Both
D.	None
Answer» C. Both

Discussion

8414.	The nuclides (A nuclide is the general name for any nuclear species) \[_{6}{{C}^{12}}{{,}_{26}}F{{e}^{56}}\] and \[_{92}{{U}^{238}}\] have 12, 56 and 238 nucleons respectively in the nuclei. The total number of nucleons in a nucleus is equal to [NCERT 1975]
A.	The total number of neutrons in the nucleus
B.	The total number of neutrons in the atom
C.	The total number of protons in the nucleus
D.	The total number of protons and neutrons in the nucleus
Answer» E.

Discussion

8415.	Which one of the following statements is wrong for gases [CBSE PMT 1999]
A.	Gases do not have a definite shape and volume
B.	Volume of the gas is equal to the volume of the container confining the gas
C.	Confined gas exerts uniform pressure on the walls of its container in all directions
D.	Mass of the gas cannot be determined by weighing a container in which it is enclosed
Answer» E.

Discussion

8416.	The weight of \[1\times {{10}^{22}}\]molecules of \[CuS{{O}_{4}}.5{{H}_{2}}O\]is [IIT 1991]
A.	41.59 g
B.	415.9 g
C.	4.159 g
D.	None of these
Answer» D. None of these

Discussion

8417.	Examine the following common chemical structures to which simple functional groups are often attached (i) (ii) (iii) (iv) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}-\] (v) \[{{H}_{2}}C=C
A.	(i) and (v)
B.	(ii) and (iii)
C.	(ii), (iii) and (iv)
D.	(iv)
Answer» B. (ii) and (iii)

Discussion

8418.	Heating steel to bright redness and then cooling suddenly by plunging it into oil or water, makes it [MP PET 1990]
A.	Hard and pliable
B.	Soft and pliable
C.	Soft and brittle
D.	Hard and brittle
Answer» E.

Discussion

8419.	\[CoO.A{{l}_{2}}{{O}_{3}}\] is called
A.	Cobalt aluminate
B.	Thenard's blue
C.	Both A and B
D.	None of these
Answer» D. None of these

Discussion

8420.	The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.690 and \[205\,J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}(g)\] is [CPMT 2001]
A.	\[1.86\,J{{K}^{-1}}\]
B.	\[1.96\,J{{K}^{-1}}\]
C.	\[2.81\,J{{K}^{-1}}\]
D.	\[2.86\,J{{K}^{-1}}\]
Answer» D. \[2.86\,J{{K}^{-1}}\]

Discussion

8421.	Which of the following reactions occurs at the cathode of a common dry cell [NCERT 1978]
A.	\[Mn\,\to \,M{{n}^{2+}}+2{{e}^{-}}\]
B.	\[2Mn{{O}_{2}}+Z{{n}^{2+}}+2{{e}^{-}}\,\to \,\,ZnM{{n}_{2}}{{O}_{4}}\]
C.	\[2Zn{{O}_{2}}+M{{n}^{2+}}+2{{e}^{-}}\,\to \,\,MnZ{{n}_{2}}{{O}_{4}}\]
D.	\[Zn\,\to \,Z{{n}^{2+}}+2{{e}^{-}}\]
Answer» C. \[2Zn{{O}_{2}}+M{{n}^{2+}}+2{{e}^{-}}\,\to \,\,MnZ{{n}_{2}}{{O}_{4}}\]

Discussion

8422.	Which of the following can give base \[O{{H}^{-}}\] [MP PET/PMT 1988]
A.	\[{{H}_{2}}O\]
B.	\[{{H}_{3}}{{O}^{+}}\]
C.	\[{{H}_{2}}\]
D.	\[HCl\]
Answer» B. \[{{H}_{3}}{{O}^{+}}\]

Discussion

8423.	Glucose has functional group [MH CET 2000]
A.	Aldehydic
B.	Aldehydic and alcoholic
C.	Alcoholic
D.	Ketonic and alcoholic
Answer» C. Alcoholic

Discussion

8424.	An emulsifier [MP PET 1995]
A.	Accelerates the dispersion
B.	Homogenises the emulsion
C.	Stabilizes the emulsion
D.	Aids the flocculation of emulsion
Answer» D. Aids the flocculation of emulsion

Discussion

8425.	Initial mass of a radioactive element is 40 g. How many grams of it would be left after 24 years, if its half-life period is 8 years [MP PMT 1985]
A.	2
B.	5
C.	10
D.	20
Answer» C. 10

Discussion

8426.	In the extraction of aluminium, bauxite is dissolved in cryolite because
A.	It acts as a solvent
B.	It reduces melting point of aluminium oxide
C.	It increases the resistance of aluminium oxide
D.	Bauxite becomes active
Answer» C. It increases the resistance of aluminium oxide

Discussion

8427.	The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectivley. Which of the following statements is NOT correct [AIEEE 2005]
A.	Magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol
B.	Sodium sulphate solution causes coagulation in both sols
C.	Mixing the sols has no effect
D.	Coagulation in both sols can be brought about by electrophoresis
Answer» D. Coagulation in both sols can be brought about by electrophoresis

Discussion

8428.	Which of the following reactions leads to the formation of a substance in the colloidal state [MP PMT 1984; MP PET/PMT 1988]
A.	\[Cu+HgC{{l}_{2}}\to CuC{{l}_{2}}+Hg\]
B.	\[2HN{{O}_{3}}+3{{H}_{2}}S\to 3S+4{{H}_{2}}O+2NO\]
C.	\[2Mg+C{{O}_{2}}\to 2MgO+C\]
D.	\[Cu+CuC{{l}_{2}}\to C{{u}_{2}}C{{l}_{2}}\] (in presence of excess of \[HCl\])
Answer» C. \[2Mg+C{{O}_{2}}\to 2MgO+C\]

Discussion

8429.	Which is used to produce smoke screens [AFMC 2005]
A.	Calcium phosphide
B.	Zinc sulphide
C.	Sodium carbonate
D.	Zinc phosphide
Answer» B. Zinc sulphide

Discussion

8430.	Point out the wrong statement in relation to enthalpy
A.	It is a state function
B.	It is an intensive property
C.	It is independent of the path followed for the change
D.	Its value depends upon the amount of substance in the system
Answer» C. It is independent of the path followed for the change

Discussion

8431.	Which is correct oxidation state of lead [AFMC 1987]
A.	+ 2, + 4
B.	+ 1, + 2
C.	+ 3, + 4
D.	4
Answer» B. + 1, + 2

Discussion

8432.	Phenolphthalein does not act as an indicator for the titration between [Pb. PMT 2002]
A.	\[NaOH\] and \[C{{H}_{3}}COOH\]
B.	\[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] and \[KMn{{O}_{4}}\]
C.	\[Ba{{(OH)}_{2}}\] and \[HCl\]
D.	\[KOH\]and \[{{H}_{2}}S{{O}_{4}}\]
Answer» C. \[Ba{{(OH)}_{2}}\] and \[HCl\]

Discussion

8433.	Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent [CPMT 1988, 93]
A.	\[C{{H}_{3}}C{{H}_{2}}OH\]
B.	\[C{{H}_{3}}CHO\]
C.	\[C{{H}_{3}}COC{{H}_{3}}\]
D.	\[C{{H}_{3}}C{{O}_{2}}C{{H}_{2}}\]
Answer» B. \[C{{H}_{3}}CHO\]

Discussion

8434.	Which one of the following properties of an element is not variable [Bihar MADT 1981]
A.	Valency
B.	Atomic weight
C.	Equivalent weight
D.	All of these
Answer» C. Equivalent weight

Discussion

8435.	The shape of ethylene molecule is [AFMC 2002]
A.	Square planar
B.	Furan
C.	Trigonal planar
D.	Tetrahedral
Answer» D. Tetrahedral

Discussion

8436.	Which of the following units represents the largest amount of energy [CPMT 1989; MP PET 2000]
A.	Electron volt
B.	Erg
C.	Joule
D.	Calorie
Answer» E.

Discussion

8437.	The frequency of an electromagnetic radiation is \[2\times {{10}^{6}}Hz\]. What is its wavelength in metres (Velocity of light \[=3\times {{10}^{8}}m{{s}^{-1}}\])
A.	\[6.0\times {{10}^{14}}\]
B.	\[1.5\times {{10}^{4}}\]
C.	\[1.5\times {{10}^{2}}\]
D.	\[0.66\times {{10}^{-2}}\]
Answer» D. \[0.66\times {{10}^{-2}}\]

Discussion

8438.	A gas decolourised \[KMn{{O}_{4}}\] solution but gives no precipitate with ammoniacal cuprous chloride is or Which of the following gases does not give a precipitate with ammoniacal solution of silver nitrate but decolourizes \[KMn{{O}_{4}}\] (neutral or slightly alkaline) [NCERT 1974, 77; CPMT 1974, 77, 78; MP PMT 1996; MP PET 1996, 99]
A.	Ethane
B.	Methane
C.	Ethene
D.	Acetylene
Answer» D. Acetylene

Discussion

8439.	Paraffins are soluble in [NCERT 1978]
A.	Distilled water
B.	Benzene
C.	Methanol
D.	Sea water
Answer» C. Methanol

Discussion

8440.	Correct name of the compound \[C{{H}_{3}}-\underset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,}}\,\] is [CPMT 1973; MP PMT 1994]
A.	Butane
B.	Isopropyl methane
C.	2-methyl propane
D.	Dimethyl ethane
Answer» D. Dimethyl ethane

Discussion

8441.	The reaction \[\underset{OH}{\mathop{\underset{\|\,}{\mathop{\overset{\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\overset{\,\|}{\mathop{C{{H}_{3}}-C-C{{H}_{3}}}}\,}}\,}}\,}}\,\xrightarrow{{{H}_{2}}S{{O}_{4}}}\overset{\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\overset{\,\|}{\mathop{C{{H}_{3}}-C=C{{H}_{2}}}}\,}}\,\] is the example of [AMU 1983]
A.	Sulphonation
B.	Dehydration
C.	Alkylation
D.	Decomposition
Answer» C. Alkylation

Discussion

8442.	Number of unpaired electrons in inert gas is [CPMT 1996]
A.	Zero
B.	8
C.	4
D.	18
Answer» B. 8

Discussion

8443.	The number of electrons in the nucleus of \[{{C}^{12}}\] is [AFMC 1995]
A.	6
B.	12
C.	0
D.	3
Answer» D. 3

Discussion

8444.	The solubility product of \[AgCl\] under standard conditions of temperature is given by [Kerala (Med.) 2003]
A.	\[1.6\times {{10}^{-5}}\]
B.	\[1.5\times {{10}^{-8}}\]
C.	\[3.2\times {{10}^{-10}}\]
D.	\[1.5\times {{10}^{-10}}\]
Answer» E.

Discussion

8445.	The ligand in potassium ferricyanide is
A.	\[{{K}^{+}}\]
B.	\[C{{N}^{-}}\]
C.	\[F{{e}^{3+}}\]
D.	\[{{\left( CN \right)}_{6}}\]
Answer» C. \[F{{e}^{3+}}\]

Discussion

8446.	100 g CaCO3 reacts with 1litre 1 N HCl. On completion of reaction how much weight of \[C{{O}_{2}}\] will be obtain [Kerala CET 2005]
A.	\[5.5\ g\]
B.	\[11\ g\]
C.	\[22\ g\]
D.	\[33\ g\]
E.	\[44\ g\]
Answer» D. \[33\ g\]

Discussion

8447.	Neutralization of an acid with a base invariably results in the production of [CPMT 1983]
A.	\[{{H}_{3}}{{O}^{+}}\]
B.	\[O{{H}^{-}}\]
C.	\[{{H}_{2}}O\]
D.	\[{{H}^{+}}\] and \[O{{H}^{-}}\]
Answer» D. \[{{H}^{+}}\] and \[O{{H}^{-}}\]

Discussion

8448.	Hydrochloric acid solutions A and B have concentration of 0.5 N and 0.1 N respectively. The volume of solutions A and B required to make 2 litres of 0.2 N hydrochloric are [KCET 1993]
A.	0.5 l of A + 1.5 l of B
B.	1.5 l of A + 0.5 l of B
C.	1.0 l of A + 1.0 l of B
D.	0.75 l of A + 1.25 l of B
Answer» B. 1.5 l of A + 0.5 l of B

Discussion

8449.	Carbon monoxide reacts with iron to form [KCET (Med.) 2001]
A.	\[Fe{{(CO)}_{5}}\]
B.	\[FeC{{O}_{2}}\]
C.	\[FeO+C\]
D.	\[F{{e}_{2}}{{O}_{3}}+C\]
Answer» E.

Discussion

8450.	On the heating copper nitrate strongly, ....... is finally obtained [CPMT 1971, 74, 78]
A.	Copper
B.	Copper oxide
C.	Copper nitrate
D.	Copper nitride
Answer» C. Copper nitrate

Discussion

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

Copper sulphate is commercially made from copper scraps by [CPMT 1973]

Which of the following statements about a catalyst is true [AIIMS 1996]

The frequency of radiation emitted when the electron falls from \[n=4\] to \[n=1\] in a hydrogen atom will be (Given ionization energy of H\[=2.18\times {{10}^{-18}}J\,\,\,\text{ato}{{\text{m}}^{-1}}\]and \[h=6.625\times {{10}^{-34}}Js\]) [CBSE PMT 2004]

For the reduction of ketones to hydrocarbon, the appropriate agent is [DPMT 2002]

Methyl group attached to benzene can be oxidised to carboxyl group by reacting with [KCET 1993]

Which of the anhydrous salts when come in contact with water turns blue [AMU 1981, 82]

A solution of \[FeC{{l}_{3}}\] in water acts as acidic due to [BVP 2003]

The equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] in acidic medium

Halogenation of alkanes is an example of [MP PET 1993; KCET 1998]

A white salt is readily soluble in water and gives a colourless solution with a \[pH\]of about 9. The salt would be [Pb. PMT 1998]

Ferrous sulphate on strong heating gives

Which one of the following properties of colloids is related with scattering of light [MP PMT 1989]

In the process \[BC{{l}_{3}}+P{{H}_{3}}\to BC{{l}_{3}}:P{{H}_{3}}\] The Lewis acid is [RPMT 2000]

The nuclides (A nuclide is the general name for any nuclear species) \[_{6}{{C}^{12}}{{,}_{26}}F{{e}^{56}}\] and \[_{92}{{U}^{238}}\] have 12, 56 and 238 nucleons respectively in the nuclei. The total number of nucleons in a nucleus is equal to [NCERT 1975]

Which one of the following statements is wrong for gases [CBSE PMT 1999]

The weight of \[1\times {{10}^{22}}\]molecules of \[CuS{{O}_{4}}.5{{H}_{2}}O\]is [IIT 1991]

Examine the following common chemical structures to which simple functional groups are often attached (i) (ii) (iii) (iv) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}-\] (v) \[{{H}_{2}}C=C

Heating steel to bright redness and then cooling suddenly by plunging it into oil or water, makes it [MP PET 1990]

\[CoO.A{{l}_{2}}{{O}_{3}}\] is called

The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.690 and \[205\,J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}(g)\] is [CPMT 2001]

Which of the following reactions occurs at the cathode of a common dry cell [NCERT 1978]

Which of the following can give base \[O{{H}^{-}}\] [MP PET/PMT 1988]

Glucose has functional group [MH CET 2000]

An emulsifier [MP PET 1995]

Initial mass of a radioactive element is 40 g. How many grams of it would be left after 24 years, if its half-life period is 8 years [MP PMT 1985]

In the extraction of aluminium, bauxite is dissolved in cryolite because

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectivley. Which of the following statements is NOT correct [AIEEE 2005]

Which of the following reactions leads to the formation of a substance in the colloidal state [MP PMT 1984; MP PET/PMT 1988]

Which is used to produce smoke screens [AFMC 2005]

Point out the wrong statement in relation to enthalpy

Which is correct oxidation state of lead [AFMC 1987]

Phenolphthalein does not act as an indicator for the titration between [Pb. PMT 2002]

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent [CPMT 1988, 93]

Which one of the following properties of an element is not variable [Bihar MADT 1981]

The shape of ethylene molecule is [AFMC 2002]

Which of the following units represents the largest amount of energy [CPMT 1989; MP PET 2000]

The frequency of an electromagnetic radiation is \[2\times {{10}^{6}}Hz\]. What is its wavelength in metres (Velocity of light \[=3\times {{10}^{8}}m{{s}^{-1}}\])

Paraffins are soluble in [NCERT 1978]

Correct name of the compound \[C{{H}_{3}}-\underset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,}}\,\] is [CPMT 1973; MP PMT 1994]

Number of unpaired electrons in inert gas is [CPMT 1996]

The number of electrons in the nucleus of \[{{C}^{12}}\] is [AFMC 1995]

The solubility product of \[AgCl\] under standard conditions of temperature is given by [Kerala (Med.) 2003]

The ligand in potassium ferricyanide is

100 g CaCO3 reacts with 1litre 1 N HCl. On completion of reaction how much weight of \[C{{O}_{2}}\] will be obtain [Kerala CET 2005]

Neutralization of an acid with a base invariably results in the production of [CPMT 1983]

Hydrochloric acid solutions A and B have concentration of 0.5 N and 0.1 N respectively. The volume of solutions A and B required to make 2 litres of 0.2 N hydrochloric are [KCET 1993]

Carbon monoxide reacts with iron to form [KCET (Med.) 2001]

On the heating copper nitrate strongly, ....... is finally obtained [CPMT 1971, 74, 78]