Which is correct about Henry?s law [KCET 2002]

The pressure applied should be high

The gas in contact with the liquid should behave as an ideal gas

There should not be any chemical interaction between the gas and liquid

The pressure applied should be high

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

\[{{H}^{+}}\] and \[O{{H}^{-}}\]

Amongst the following chemical reactions, the one representing homogeneous catalysis is [MP PMT 1999]

\[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\]

\[{{N}_{2}}(g)+3{{H}_{2}}(g)\xrightarrow{Fe}2N{{H}_{3}}(g)\]

\[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{2NO}2S{{O}_{3}}(g)+2NO(g)\]

\[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\]

\[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{{{V}_{2}}{{O}_{5}}}2S{{O}_{3}}(g)\]

The following compound can exhibits \[\begin{matrix} C{{H}_{3}} \\ C{{H}_{3}} \\ \end{matrix}>\underset{\begin{smallmatrix} \\ \ \ C{{H}_{3}} \end{smallmatrix}}{\mathop{C=C}}\,\underset{\cancel{\,\,\,\,\,\,\,\,\,\,}}{\overset{{}}{\mathop{

Geometrical and optical isomerisms

Which statement is true for cyclohexane [MP PET 1996]

Boat conformation is most stable

Chair and boat conformations differ in energy by 44 kJ/mol

Boric acid is a weak monobasic acid and acts as Lewis acid

By donating lone pair of electrons

By accepting lone pair of electrons.

Addition of solution of oxalate to an aqueous solution of mixture of \[B{{a}^{++}},S{{r}^{++}}\] and \[C{{a}^{++}}\] will precipitate [MP PMT 1985]

\[C{{a}^{++}}\] and \[S{{r}^{++}}\]

\[B{{a}^{++}}\] and \[S{{r}^{++}}\]

The reduction potential of hydrogen half-cell will be negative if

\[p({{H}_{2}})=2\,atm\,and\,[{{H}^{+}}]=2.0M\]

\[p({{H}_{2}})=1\,atm\,and\,[{{H}^{+}}]=2.0M\]

\[p({{H}_{2}})=1\,atm\,and\,[{{H}^{+}}]=1.0M\]

\[p({{H}_{2}})=2\,atm\,and\,[{{H}^{+}}]=1.0M\]

EMF of which of the following cells at 298 K is highest? Given, \[E_{\left( M{{g}^{2+}}/mg \right)}^{0}=-2.37V;\] \[E_{\left( C{{u}^{2}}/Cu \right)}^{0}=+2.34V;\] \[E_{\left( F{{e}^{2+}}/Fe \right)}^{0}=-0.44V;\] \[E_{\left( S{{n}^{2+}}/Sn \right)}^{0}=-0.14V;\] \[E_{\left( \frac{1}{2}B{{r}_{2}}/B{{r}^{-}} \right)}^{0}=+1.08V;\]

\[Fe(s)|F{{e}^{2+}}(0.001M)|\]\[|{{H}^{+}}(1M)|{{H}_{2}}(g)(1bar)|Pt(s)\]

\[Mg(s)|M{{g}^{2+}}(0.001M)|\]\[|C{{u}^{2+}}(0.0001M)|Cu(s)\]

\[Fe(s)|F{{e}^{2+}}(0.001M)|\]\[|{{H}^{+}}(1M)|{{H}_{2}}(g)(1bar)|Pt(s)\]

\[Sn(s)S{{n}^{2+}}(0.050M)|\]\[|{{H}^{+}}(0.020M)|{{H}_{2}}(g)(1bar)|Pt(s)\]

\[Pt(s)|B{{r}_{2}}(l)|B{{r}^{+}}(0.010M)|\]\[|{{H}^{+}}(0.030M)|{{H}_{2}}(g)(1bar)|Pt(s)\]

Which of the following statements about amorphous solids is incorrect [KCET 2004]

There is no orderly arrangement of particles

They melt over a range of temperature

There is no orderly arrangement of particles

They are rigid and incompressible

Which of the following combustion reactions would give maximum energy output per unit mass fuel plus oxidant when used to propel a rocket?

\[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l),\]\[\Delta H=-890\,kJ/mol\]

\[C(s)+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g),\,\,\Delta H=-394\,KJ/mol\]

\[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}{{H}_{2}}O(l),\,\Delta H=-285\,kJ/mol\]

\[\frac{1}{2}{{H}_{2}}+\frac{1}{2}{{F}_{2}}\xrightarrow{{}}2HF(g),\,\Delta H=-271\,kJ/mol\]

\[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l),\]\[\Delta H=-890\,kJ/mol\]

For an electron if the uncertainty in velocity is \[\Delta \nu \], the uncertainty in its position \[(\Delta x)\] is given by [DPMT 2005]

\[\frac{4\pi \ m}{h\ .\ \Delta \nu }\]

\[\frac{hm}{4\pi \Delta \nu }\]

\[\frac{4\pi }{hm\Delta \nu }\]

\[\frac{h}{4\pi m\Delta \nu }\]

\[\frac{4\pi \ m}{h\ .\ \Delta \nu }\]

Which of the following sulphate is insoluble in water [MNR 1995]

\[Bi{{\left( S{{O}_{4}} \right)}_{3}}\]

The reaction of \[KMn{{O}_{4}}\] and \[HCl\] results in

oxidation of Mn in\[KMn{{O}_{4}}\] and production of\[C{{l}_{2}}\].

reduction of Mn in \[KMn{{O}_{4}}\] and production of \[{{H}_{2}}\].

oxidation of Mn in \[KMn{{O}_{4}}\] and production of \[{{H}_{2}}\].

reduction of Mn in \[KMn{{O}_{4}}\] and production of\[C{{l}_{2}}\].

A catalyst is a substance which [Pb. CET 2004]

Participates in the reaction and provide an easier pathway for the same

Is always in the same phase as in the reactions

Alters the equilibrium in a reaction

Does not participate in the reaction but alters the rate of reaction

Participates in the reaction and provide an easier pathway for the same

Lyophilic sols are [IIT 2005]

They are prepared from inorganic compound

Coagulated by adding electrolytes

A crystalline solid [Kerala CET (Med.) 2003]

Changes abruptly from solid to liquid when heated

Undergoes deformation of its geometry easily

Has an irregular 3-dimensional arrangements

Lactic acid in which a methyl group, a hydroxyl group, a carboxylic acid group and a hydrogen atom are attached to a central carbon atom, shown optical isomerism due to the molecular geometry at the [Pb. PMT 2000]

Carbon atom of the methyl group

Carbon atom of the carboxylic acid group

The basis of keeping the elements in the group of a periodic table is [RPET 1999]

Number of electrons in the valence shell

Which of the following parameter is correct regarding adsorption of gases over solid?

\[\Delta {{S}_{surronunding}}>0\]

A dye absorbs a photon of wavelength \[\lambda \] and re-emits the same energy into two photons of wavelength \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] respectively. The wavelength \[\lambda \] is related with \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] as:

\[\lambda =\frac{{{\lambda }_{1}}^{2}{{\lambda }_{2}}^{2}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\]

\[\lambda =\frac{{{\lambda }_{1}}+{{\lambda }_{2}}}{{{\lambda }_{1}}{{\lambda }_{2}}}\]

\[\lambda =\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\]

\[\lambda =\frac{{{\lambda }_{1}}^{2}{{\lambda }_{2}}^{2}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\]

\[\lambda =\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{({{\lambda }_{1}}+{{\lambda }_{2}})}^{2}}}\]

Anhydrous \[AlC{{l}_{3}}\] is prepared from

aluminium and \[C{{l}_{\text{2}}}\]

dry \[HCl\] gas + heated Al metal

11242 + Mcqs in Chemistry in Joint Entrance Exam - Main (JEE Main) Page 3 McqOptions

101.	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

102.	Which is correct about Henry?s law [KCET 2002]
A.	The gas in contact with the liquid should behave as an ideal gas
B.	There should not be any chemical interaction between the gas and liquid
C.	The pressure applied should be high
D.	All of these
Answer» C. The pressure applied should be high

Discussion

103.	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

104.	Which type of solid crystals will conduct heat and electricity [RPET 2000]
A.	Ionic
B.	Covalent
C.	Metallic
D.	Molecular
Answer» D. Molecular

Discussion

105.	Amongst the following chemical reactions, the one representing homogeneous catalysis is [MP PMT 1999]
A.	\[{{N}_{2}}(g)+3{{H}_{2}}(g)\xrightarrow{Fe}2N{{H}_{3}}(g)\]
B.	\[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{2NO}2S{{O}_{3}}(g)+2NO(g)\]
C.	\[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\]
D.	\[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{{{V}_{2}}{{O}_{5}}}2S{{O}_{3}}(g)\]
Answer» C. \[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\]

Discussion

106.	Which of the following expressions represents the first law of thermodynamics?
A.	\[\Delta E=-q+W\]
B.	\[\Delta E=q-W\]
C.	\[\Delta E=q+W\]
D.	\[\Delta E=-q-W\]
Answer» D. \[\Delta E=-q-W\]

Discussion

107.	The following compound can exhibits \[\begin{matrix} C{{H}_{3}} \\ C{{H}_{3}} \\ \end{matrix}>\underset{\begin{smallmatrix} \\ \ \ C{{H}_{3}} \end{smallmatrix}}{\mathop{C=C}}\,\underset{\cancel{\,\,\,\,\,\,\,\,\,\,}}{\overset{{}}{\mathop{<}}}\,\begin{matrix} H \\ C< \\ \end{matrix}\begin{matrix} \underset{H\ \ \ \ \ \,}{\mathop{{}}}\, \\ \underset{COOH}{\mathop{{}}}\, \\ \end{matrix}\] [IIT-JEE 1995; DCE 2000]
A.	Tautomerism
B.	Optical isomerism
C.	Geometrical isomerism
D.	Geometrical and optical isomerisms
Answer» C. Geometrical isomerism

Discussion

108.	Name the compound, that is not isomer with diethyl ether [IIT-JEE 1981; CPMT 1989; MADT Bihar 1995]
A.	n-propylmethyl ether
B.	Butane-1-ol
C.	2-methylpropane-2-ol
D.	Butanone
Answer» E.

Discussion

109.	Which statement is true for cyclohexane [MP PET 1996]
A.	It has two possible isomers
B.	It has three conformations
C.	Boat conformation is most stable
D.	Chair and boat conformations differ in energy by 44 kJ/mol
Answer» E.

Discussion

110.	\[Zn\|Z{{n}^{+2}}({{C}_{1}})\|\|Z{{n}^{+2}}({{C}_{2}})\|Zn\] For this cell \[\Delta G\] is negative if
A.	\[{{C}_{1}}={{C}_{2}}\]
B.	\[{{C}_{1}}>{{C}_{2}}\]
C.	\[{{C}_{2}}>{{C}_{1}}\]
D.	Both [a] and [c] are correct
Answer» D. Both [a] and [c] are correct

Discussion

111.	Boric acid is a weak monobasic acid and acts as Lewis acid
A.	By donating \[{{H}^{+}}\]
B.	By accepting \[O{{H}^{-}}\]
C.	By donating lone pair of electrons
D.	By accepting lone pair of electrons.
Answer» C. By donating lone pair of electrons

Discussion

112.	Addition of solution of oxalate to an aqueous solution of mixture of \[B{{a}^{++}},S{{r}^{++}}\] and \[C{{a}^{++}}\] will precipitate [MP PMT 1985]
A.	\[C{{a}^{++}}\]
B.	\[C{{a}^{++}}\] and \[S{{r}^{++}}\]
C.	\[B{{a}^{++}}\] and \[S{{r}^{++}}\]
D.	All the three
Answer» E.

Discussion

113.	Which compound is soluble in\[N{{H}_{4}}OH\] [AFMC 1987]
A.	\[PbC{{l}_{2}}\]
B.	\[PbS{{O}_{4}}\]
C.	\[AgCl\]
D.	\[CaC{{O}_{3}}\]
Answer» D. \[CaC{{O}_{3}}\]

Discussion

114.	In order to prepare one litre normal solution of KMnO4, how many gm of KMnO4 are required, if the solution is to be used in acid medium for oxidation [MP PET 2002]
A.	158 gm
B.	31.60 gm
C.	62.0 gm
D.	790 gm
Answer» C. 62.0 gm

Discussion

115.	The correct relationship between the boiling points of very dilute solutions of \[AlC{{l}_{3}}\,({{t}_{1}})\] and \[CaC{{l}_{2}}\,({{t}_{2}})\], having the same molar concentration is [CPMT 1983]
A.	\[{{t}_{1}}={{t}_{2}}\]
B.	\[{{t}_{1}}>{{t}_{2}}\]
C.	\[{{t}_{2}}>{{t}_{1}}\]
D.	\[{{t}_{2}}\ge {{t}_{1}}\]
Answer» C. \[{{t}_{2}}>{{t}_{1}}\]

Discussion

116.	The reduction potential of hydrogen half-cell will be negative if
A.	\[p({{H}_{2}})=2\,atm\,and\,[{{H}^{+}}]=2.0M\]
B.	\[p({{H}_{2}})=1\,atm\,and\,[{{H}^{+}}]=2.0M\]
C.	\[p({{H}_{2}})=1\,atm\,and\,[{{H}^{+}}]=1.0M\]
D.	\[p({{H}_{2}})=2\,atm\,and\,[{{H}^{+}}]=1.0M\]
Answer» E.

Discussion

117.	EMF of which of the following cells at 298 K is highest? Given, \[E_{\left( M{{g}^{2+}}/mg \right)}^{0}=-2.37V;\] \[E_{\left( C{{u}^{2}}/Cu \right)}^{0}=+2.34V;\] \[E_{\left( F{{e}^{2+}}/Fe \right)}^{0}=-0.44V;\] \[E_{\left( S{{n}^{2+}}/Sn \right)}^{0}=-0.14V;\] \[E_{\left( \frac{1}{2}B{{r}_{2}}/B{{r}^{-}} \right)}^{0}=+1.08V;\]
A.	\[Mg(s)\|M{{g}^{2+}}(0.001M)\|\]\[\|C{{u}^{2+}}(0.0001M)\|Cu(s)\]
B.	\[Fe(s)\|F{{e}^{2+}}(0.001M)\|\]\[\|{{H}^{+}}(1M)\|{{H}_{2}}(g)(1bar)\|Pt(s)\]
C.	\[Sn(s)S{{n}^{2+}}(0.050M)\|\]\[\|{{H}^{+}}(0.020M)\|{{H}_{2}}(g)(1bar)\|Pt(s)\]
D.	\[Pt(s)\|B{{r}_{2}}(l)\|B{{r}^{+}}(0.010M)\|\]\[\|{{H}^{+}}(0.030M)\|{{H}_{2}}(g)(1bar)\|Pt(s)\]
Answer» B. \[Fe(s)\|F{{e}^{2+}}(0.001M)\|\]\[\|{{H}^{+}}(1M)\|{{H}_{2}}(g)(1bar)\|Pt(s)\]

Discussion

118.	On electrolyzing the molten chloride of metal \[725\text{ }ml\] of \[C{{l}_{2}}\] liberated at \[25{}^\circ C\] and 740 mm Hg pressure at anode for every one gm of metal deposite at cathode. The formula of metal chloride is (GAM of metal \[=52.01\])
A.	\[MCI\]
B.	\[MC{{I}_{2}}\]
C.	\[MC{{I}_{3}}\]
D.	\[MC{{I}_{4}}\]
Answer» D. \[MC{{I}_{4}}\]

Discussion

119.	Which of the following statements about amorphous solids is incorrect [KCET 2004]
A.	They melt over a range of temperature
B.	They are anisotropic
C.	There is no orderly arrangement of particles
D.	They are rigid and incompressible
Answer» C. There is no orderly arrangement of particles

Discussion

120.	When heated above \[916{}^\circ C,\] iron changes its bcc crystalline form to fcc without the change in the radius of atom. The ratio of the density of the crystal before heating and after heating is:
A.	1.069
B.	0.918
C.	0.725
D.	1.231
Answer» C. 0.725

Discussion

121.	The normality of 1 M solution of \[{{H}_{3}}P{{O}_{4}}\] will be [AIIMS 1983, 91]
A.	1 N
B.	0.5 N
C.	2 N
D.	3 N
Answer» E.

Discussion

122.	The composition of sample of wustite is \[F{{e}_{0.93}}{{O}_{1.00}}\]. What percentage of the iron is present in the form of Fe (III)?
A.	0.14
B.	0.1505
C.	0.17
D.	0.29
Answer» C. 0.17

Discussion

123.	Which of the following combustion reactions would give maximum energy output per unit mass fuel plus oxidant when used to propel a rocket?
A.	\[C(s)+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g),\,\,\Delta H=-394\,KJ/mol\]
B.	\[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}{{H}_{2}}O(l),\,\Delta H=-285\,kJ/mol\]
C.	\[\frac{1}{2}{{H}_{2}}+\frac{1}{2}{{F}_{2}}\xrightarrow{{}}2HF(g),\,\Delta H=-271\,kJ/mol\]
D.	\[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l),\]\[\Delta H=-890\,kJ/mol\]
Answer» D. \[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l),\]\[\Delta H=-890\,kJ/mol\]

Discussion

124.	For an electron if the uncertainty in velocity is \[\Delta \nu \], the uncertainty in its position \[(\Delta x)\] is given by [DPMT 2005]
A.	\[\frac{hm}{4\pi \Delta \nu }\]
B.	\[\frac{4\pi }{hm\Delta \nu }\]
C.	\[\frac{h}{4\pi m\Delta \nu }\]
D.	\[\frac{4\pi \ m}{h\ .\ \Delta \nu }\]
Answer» D. \[\frac{4\pi \ m}{h\ .\ \Delta \nu }\]

Discussion

125.	Which of the following sulphate is insoluble in water [MNR 1995]
A.	\[CuS{{O}_{4}}\]
B.	\[CdS{{O}_{4}}\]
C.	\[PbS{{O}_{4}}\]
D.	\[Bi{{\left( S{{O}_{4}} \right)}_{3}}\]
Answer» E.

Discussion

126.	2.76 g of silver carbonate (at mass of Ag 108) on being heated strongly yield a residue weighing
A.	2.16 g
B.	2.48 g
C.	2.32 g
D.	2.64 g
Answer» B. 2.48 g

Discussion

127.	The reaction of \[KMn{{O}_{4}}\] and \[HCl\] results in
A.	oxidation of Mn in\[KMn{{O}_{4}}\] and production of\[C{{l}_{2}}\].
B.	reduction of Mn in \[KMn{{O}_{4}}\] and production of \[{{H}_{2}}\].
C.	oxidation of Mn in \[KMn{{O}_{4}}\] and production of \[{{H}_{2}}\].
D.	reduction of Mn in \[KMn{{O}_{4}}\] and production of\[C{{l}_{2}}\].
Answer» E.

Discussion

128.	Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure lime stone \[(CaC{{O}_{3}}).\]
A.	104.4 kg
B.	105.4 kg
C.	212.8 kg
D.	106.4 kg
Answer» E.

Discussion

129.	The ionization energy of hydrogen atom (in the ground state) is x kJ. The energy required for an electron to jump from 2nd orbit to the \[{{3}^{rd}}\] orbit will be
A.	x/6
B.	5x
C.	7.2 x
D.	5x/36
Answer» E.

Discussion

130.	The magnetic moment of a transition metal ion is found to be 5.92 BM. The number of unpaired electrons present in it is
A.	2
B.	3
C.	4
D.	5
Answer» E.

Discussion

131.	A catalyst is a substance which [Pb. CET 2004]
A.	Is always in the same phase as in the reactions
B.	Alters the equilibrium in a reaction
C.	Does not participate in the reaction but alters the rate of reaction
D.	Participates in the reaction and provide an easier pathway for the same
Answer» D. Participates in the reaction and provide an easier pathway for the same

Discussion

132.	Lyophilic sols are [IIT 2005]
A.	Irreversible sols
B.	They are prepared from inorganic compound
C.	Coagulated by adding electrolytes
D.	Self-stabilizing
Answer» E.

Discussion

133.	The number of water molecules present in a drop of water (volume 0.0018 mL) density =\[18m{{L}^{-1}}\] at room temperature is
A.	\[1.084\times {{10}^{18}}\]
B.	\[6.023\times {{10}^{19}}\]
C.	\[4.84\times {{10}^{17}}\]
D.	\[6.023\times {{10}^{23}}\]
Answer» C. \[4.84\times {{10}^{17}}\]

Discussion

134.	A crystalline solid [Kerala CET (Med.) 2003]
A.	Changes abruptly from solid to liquid when heated
B.	Has no definite melting point
C.	Undergoes deformation of its geometry easily
D.	Has an irregular 3-dimensional arrangements
E.	Softens slowly
Answer» B. Has no definite melting point

Discussion

135.	Liebermann's nitroso reaction is used for testing
A.	Primary amines
B.	Secondary amines
C.	Tertiary amines
D.	All the above
Answer» C. Tertiary amines

Discussion

136.	Electron addition will be easier in:
A.	O
B.	\[{{O}^{+}}\]
C.	\[{{O}^{2+}}\]
D.	\[{{O}^{2-}}\]
Answer» D. \[{{O}^{2-}}\]

Discussion

137.	The prefix zepto stands for [DPMT 2004]
A.	\[{{10}^{9}}\]
B.	\[{{10}^{-12}}\]
C.	\[{{10}^{-15}}\]
D.	\[{{10}^{-21}}\]
Answer» E.

Discussion

138.	Only two isomeric monochloro derivatives are possible for [Pb. PMT 2000]
A.	2-methyl propane
B.	n-pentane
C.	Benzene
D.	2, 4-dimethyl pentane
Answer» B. n-pentane

Discussion

139.	Lactic acid in which a methyl group, a hydroxyl group, a carboxylic acid group and a hydrogen atom are attached to a central carbon atom, shown optical isomerism due to the molecular geometry at the [Pb. PMT 2000]
A.	Central carbon atom
B.	Carbon atom of the methyl group
C.	Carbon atom of the carboxylic acid group
D.	Oxygen of the hydroxyl groups
Answer» B. Carbon atom of the methyl group

Discussion

140.	Which of the following transitions have minimum wavelength [DPMT 2005]
A.	\[{{n}_{4}}\to {{n}_{1}}\]
B.	\[{{n}_{2}}\to {{n}_{1}}\]
C.	\[{{n}_{4}}\to {{n}_{2}}\]
D.	\[{{n}_{3}}\to {{n}_{1}}\]
Answer» B. \[{{n}_{2}}\to {{n}_{1}}\]

Discussion

141.	When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together [AFMC 2001]
A.	Hydrogen bond formation
B.	Van der Waals forces
C.	Covalent attraction
D.	Ionic interaction
Answer» B. Van der Waals forces

Discussion

142.	What is formed when calcium carbide reacts with heavy water [Manipal PMT 2001; Pb. CET 2000]
A.	\[{{C}_{2}}{{D}_{2}}\]
B.	\[Ca{{D}_{2}}\]
C.	\[C{{a}_{2}}{{D}_{2}}O\]
D.	\[C{{D}_{2}}\]
Answer» B. \[Ca{{D}_{2}}\]

Discussion

143.	Animal charcoal is used in decolourising colour of liquids because it is a good [MHCET 2004]
A.	Adsorbate
B.	Adsorbent
C.	Oxidising agent
D.	Reducing agent
Answer» B. Adsorbent

Discussion

144.	A crystalline solid have [DCE 2001]
A.	Long range order
B.	Short range order
C.	Disordered arrangement
D.	None of these
Answer» B. Short range order

Discussion

145.	Which of the following elements is found in native state [RPET 1999]
A.	Al
B.	Au
C.	Cu
D.	Na
Answer» C. Cu

Discussion

146.	The basis of keeping the elements in the group of a periodic table is [RPET 1999]
A.	Ionisation potential
B.	Electronegativity
C.	Electron affinity
D.	Number of electrons in the valence shell
Answer» E.

Discussion

147.	What will be the difference between electromagnetic radiation shown in A and B respectively?(i) Velocity (ii) Wavelength(iii) Frequency (iv) Energy
A.	(ii) only
B.	(ii) and (iv)
C.	(ii), (iii) and (iv)
D.	(iv) only
Answer» D. (iv) only

Discussion

148.	Which of the following parameter is correct regarding adsorption of gases over solid?
A.	\[\Delta {{S}_{system}}>0\]
B.	\[\Delta {{S}_{surronunding}}>0\]
C.	\[\Delta G>0\]
D.	\[\Delta H>0\]
Answer» C. \[\Delta G>0\]

Discussion

149.	A dye absorbs a photon of wavelength \[\lambda \] and re-emits the same energy into two photons of wavelength \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] respectively. The wavelength \[\lambda \] is related with \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] as:
A.	\[\lambda =\frac{{{\lambda }_{1}}+{{\lambda }_{2}}}{{{\lambda }_{1}}{{\lambda }_{2}}}\]
B.	\[\lambda =\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\]
C.	\[\lambda =\frac{{{\lambda }_{1}}^{2}{{\lambda }_{2}}^{2}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\]
D.	\[\lambda =\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{({{\lambda }_{1}}+{{\lambda }_{2}})}^{2}}}\]
Answer» C. \[\lambda =\frac{{{\lambda }_{1}}^{2}{{\lambda }_{2}}^{2}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\]

Discussion

150.	Anhydrous \[AlC{{l}_{3}}\] is prepared from
A.	cone. \[HCl\] and Al metal
B.	aluminium and \[C{{l}_{\text{2}}}\]
C.	dry \[HCl\] gas + heated Al metal
D.	dil. \[HCl\] and Al metal
Answer» D. dil. \[HCl\] and Al metal

Discussion

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

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

Which is correct about Henry?s law [KCET 2002]

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

Which type of solid crystals will conduct heat and electricity [RPET 2000]

Amongst the following chemical reactions, the one representing homogeneous catalysis is [MP PMT 1999]

Which of the following expressions represents the first law of thermodynamics?

Name the compound, that is not isomer with diethyl ether [IIT-JEE 1981; CPMT 1989; MADT Bihar 1995]

Which statement is true for cyclohexane [MP PET 1996]

\[Zn|Z{{n}^{+2}}({{C}_{1}})||Z{{n}^{+2}}({{C}_{2}})|Zn\] For this cell \[\Delta G\] is negative if

Boric acid is a weak monobasic acid and acts as Lewis acid

Addition of solution of oxalate to an aqueous solution of mixture of \[B{{a}^{++}},S{{r}^{++}}\] and \[C{{a}^{++}}\] will precipitate [MP PMT 1985]

Which compound is soluble in\[N{{H}_{4}}OH\] [AFMC 1987]

In order to prepare one litre normal solution of KMnO4, how many gm of KMnO4 are required, if the solution is to be used in acid medium for oxidation [MP PET 2002]

The correct relationship between the boiling points of very dilute solutions of \[AlC{{l}_{3}}\,({{t}_{1}})\] and \[CaC{{l}_{2}}\,({{t}_{2}})\], having the same molar concentration is [CPMT 1983]

The reduction potential of hydrogen half-cell will be negative if

On electrolyzing the molten chloride of metal \[725\text{ }ml\] of \[C{{l}_{2}}\] liberated at \[25{}^\circ C\] and 740 mm Hg pressure at anode for every one gm of metal deposite at cathode. The formula of metal chloride is (GAM of metal \[=52.01\])

Which of the following statements about amorphous solids is incorrect [KCET 2004]

When heated above \[916{}^\circ C,\] iron changes its bcc crystalline form to fcc without the change in the radius of atom. The ratio of the density of the crystal before heating and after heating is:

The normality of 1 M solution of \[{{H}_{3}}P{{O}_{4}}\] will be [AIIMS 1983, 91]

The composition of sample of wustite is \[F{{e}_{0.93}}{{O}_{1.00}}\]. What percentage of the iron is present in the form of Fe (III)?

Which of the following combustion reactions would give maximum energy output per unit mass fuel plus oxidant when used to propel a rocket?

For an electron if the uncertainty in velocity is \[\Delta \nu \], the uncertainty in its position \[(\Delta x)\] is given by [DPMT 2005]

Which of the following sulphate is insoluble in water [MNR 1995]

2.76 g of silver carbonate (at mass of Ag 108) on being heated strongly yield a residue weighing

The reaction of \[KMn{{O}_{4}}\] and \[HCl\] results in

Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure lime stone \[(CaC{{O}_{3}}).\]

The ionization energy of hydrogen atom (in the ground state) is x kJ. The energy required for an electron to jump from 2nd orbit to the \[{{3}^{rd}}\] orbit will be

The magnetic moment of a transition metal ion is found to be 5.92 BM. The number of unpaired electrons present in it is

A catalyst is a substance which [Pb. CET 2004]

Lyophilic sols are [IIT 2005]

The number of water molecules present in a drop of water (volume 0.0018 mL) density =\[18m{{L}^{-1}}\] at room temperature is

A crystalline solid [Kerala CET (Med.) 2003]

Liebermann's nitroso reaction is used for testing

Electron addition will be easier in:

The prefix zepto stands for [DPMT 2004]

Only two isomeric monochloro derivatives are possible for [Pb. PMT 2000]

Lactic acid in which a methyl group, a hydroxyl group, a carboxylic acid group and a hydrogen atom are attached to a central carbon atom, shown optical isomerism due to the molecular geometry at the [Pb. PMT 2000]

Which of the following transitions have minimum wavelength [DPMT 2005]

When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together [AFMC 2001]

What is formed when calcium carbide reacts with heavy water [Manipal PMT 2001; Pb. CET 2000]

Animal charcoal is used in decolourising colour of liquids because it is a good [MHCET 2004]

A crystalline solid have [DCE 2001]

Which of the following elements is found in native state [RPET 1999]

The basis of keeping the elements in the group of a periodic table is [RPET 1999]

What will be the difference between electromagnetic radiation shown in A and B respectively?(i) Velocity (ii) Wavelength(iii) Frequency (iv) Energy

Which of the following parameter is correct regarding adsorption of gases over solid?

A dye absorbs a photon of wavelength \[\lambda \] and re-emits the same energy into two photons of wavelength \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] respectively. The wavelength \[\lambda \] is related with \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] as:

Anhydrous \[AlC{{l}_{3}}\] is prepared from