Given Reaction Energy Change (in KJ) \[Li\left( s \right)\to Li\left( g \right)\] 161 \[Li\left( g \right)\to L{{i}^{+}}\left( g \right)\] 520 \[\frac{1}{2}{{F}_{2}}(g)\to F(g)\] 77 \[F\left( g \right)+{{e}^{-}}\to {{F}^{-}}\left( g \right)\] Electron gain enthalpy \[L{{i}^{+}}(g)+{{F}^{-}}(g)\to LiF(s)\] -1047 \[Li(s)+\frac{1}{2}{{F}_{2}}(g)\to LiF(s)\] -617 Based on data provided, the value of electron gain enthalpy of fluorine would be:

\[-228\text{ }kJ\text{ }mo{{l}^{-1}}\]

\[-328\text{ }kJ\text{ }mo{{l}^{-1}}\]

\[-228\text{ }kJ\text{ }mo{{l}^{-1}}\]

Which of the following is correct set of physical properties of the geometrical isomers?

Dipole momentB.P.M.P.StabilityII>III>II>III>II

Dipole momentB.P.M.P.StabilityI>III>IIII>II>II

Dipole momentB.P.M.P.StabilityII>III>III>III>I

Dipole momentB.P.M.P.StabilityI>III>III>III>II

Dipole momentB.P.M.P.StabilityII>III>II>III>II

Which of the following statements regarding difference between adsorption and absorption is incorrect?

All of the above statements are correct.

Adsorption is a surface whereas absorption is a bulk phenomena.

Water vapours are absorbed by anhydrous \[CaC{{l}_{2}}\] but adsorbed by silica gel.

Adsorption and absorption take place individually. They can not occur simultaneously.

All of the above statements are correct.

What is the energy gap between valence band and conduction band in crystal of insulators?

Both the bands are overlapped with each other

The protecting power of lyophilic colloidal sol is expressed in terms of:

critical miscelle concentration

Zinc and mercury do not show variable valency like d-block element because

they have only two electrons in the outermost shell.

For the auto-ionization of water at \[25{}^\circ C,\] \[{{H}_{2}}O(l)\rightleftharpoons {{H}^{+}}(aq)+O{{H}^{-}}(aq)\] equilibrium constant is \[{{10}^{-14}}\]. What is \[\Delta G{}^\circ \] for the process?

\[\simeq 3.5\times {{10}^{4}}Jmo{{l}^{-1}}\]

\[\simeq 8\times {{10}^{4}}J\text{ }mo{{l}^{-1}}\]

\[\simeq 3.5\times {{10}^{4}}Jmo{{l}^{-1}}\]

\[\simeq 2\times {{10}^{4}}Jmo{{l}^{-1}}\]

Temperature of 5 moles of a gas is decreased by 2K at constant pressure. Indicate the correct statement

Work done over the gas is = 10 R

The enthalpy of neutralisation of \[N{{H}_{4}}OH\]and \[C{{H}_{3}}COOH\] is \[-10.5\text{ }kcal\text{ }mo{{l}^{-1}}\] and enthalpy of neutralisation of \[C{{H}_{3}}COOH\] with strong base is\[-12.5\,kcal\text{ }mo{{l}^{-1}}\]. The enthalpy of ionisation of \[N{{H}_{4}}OH\] will be

\[3.0\text{ }kcal\text{ }mo{{l}^{-1}}\]

\[3.2\text{ }kcal\text{ }mo{{l}^{-1}}\]

\[2.0\text{ }kcal\text{ }mo{{l}^{-1}}\]

\[3.0\text{ }kcal\text{ }mo{{l}^{-1}}\]

\[4.0\text{ }kcal\text{ }mo{{l}^{-1}}\]

Cyclopropane and oxygen at partial pressures 170 torr and 570 torr respectively are mixed in a gas cylinder. What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen \[(n{{C}_{3}}{{H}_{6}}/n{{O}_{2}})\]

\[\frac{170\times 42}{570\times 32}=0.39\]

\[\frac{170}{42}/\left( \frac{170}{42}+\frac{570}{32} \right)\approx 0.19\]

Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A

B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

Which one of the following sets forms the biodegradable polymer?

\[HO-C{{H}_{2}}-C{{H}_{2}}-OH\] and

\[C{{H}_{2}}=CH-CN\] and \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]

\[{{H}_{2}}N-C{{H}_{2}}-COOH\] and \[{{H}_{2}}N-{{(C{{H}_{2}})}_{5}}-COOH\]

\[HO-C{{H}_{2}}-C{{H}_{2}}-OH\] and

and \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]

The blue complex formed on addition of cone. \[N{{H}_{4}}OH\] solution to a \[C{{u}^{2+}}\] salt solution has the structure?

\[{{[Cu{{(N{{H}_{4}})}_{2}}]}^{2+}}\]

\[{{[Cu{{(N{{H}_{4}})}_{4}}]}^{2+}}\]

\[{{[Cu{{(N{{H}_{3}})}_{2}}]}^{2+}}\]

\[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\]

\[{{[Cu{{(N{{H}_{4}})}_{2}}]}^{2+}}\]

Fog is a colloidal solution of

gaseous particles dispersed in a liquid

solid particles dispersed in gas

solid particles dispersed in a liquid

liquid particles dispersed in gas

gaseous particles dispersed in a liquid

The correct statement for both the processes of physisorption and chemisorption is

physisorption is endothermic but chemisorption is exothermic.

chemisorption is endothermic but physisorption is exothermic

physisorption is endothermic but chemisorption is exothermic.

Which of the following value of \[{{\Delta }_{f}}{{H}^{{}^\circ }}\] represent that the product is least stable?

\[-94.0\text{ }kcal\text{ }mo{{l}^{-1}}\]

\[-231.6\text{ }kcal\text{ }mo{{l}^{-1}}\]

\[+21.4\text{ }kcal\text{ }mo{{l}^{-1}}\]

\[+64.8\text{ }kcal\text{ }mo{{l}^{-1}}\]

Hydrogen has an ionisation energy of \[1311\text{ }kJ\text{ }mo{{l}^{-1}}\] and for chlorine it is \[1256\text{ }kJ\text{ }mo{{l}^{-1}}.\] Hydrogen forms \[{{H}^{+}}\left( aq \right)\] ions but chlorine does not form \[C{{l}^{+}}(aq)\] ions because

\[Cl\] has high electron affinity

\[{{H}^{+}}\] has lower hydration enthalpy

\[C{{l}^{+}}\]has lower hydration enthalpy

\[Cl\] has high electron affinity

\[Cl\] has high electronegativity

The molar entropies of HI (g) and I (g) at 298 K are 206.5, 114.6, and \[180.7\text{ }J\text{ }mo{{l}^{-1}}{{K}^{-1}}\] respectively. Using the\[\Delta G{}^\circ \]given Below, calculate the bond energy of HI. \[HI\left( g \right)\xrightarrow{{}}H\left( g \right)+I\left( g \right);\text{ }\Delta G{}^\circ =271.8\text{ }kJ\]

\[290.1\text{ }kJmo{{l}^{-1}}\]

\[282.4\text{ }kJmo{{l}^{-1}}\]

\[298.3\text{ }kJmo{{l}^{-1}}\]

\[290.1\text{ }kJmo{{l}^{-1}}\]

\[315.4\text{ }kJmo{{l}^{-1}}\]

Which of the following is not formed when \[{{H}_{2}}S\] reacts with acidic \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution?

\[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]

The adsorption of a gas on a solid surface varies with pressure of the gas in which of the following manner.

Slow \[\to \] fast \[\to \] independent of the pressure

Fast \[\to \] slow \[\to \] independent of the pressure

Slow \[\to \] fast \[\to \] independent of the pressure

Independent of the pressure \[\to \] fast \[\to \] slow

Independent of the pressure \[\to \] slow \[\to \] fast

When does a gas deviate the most from its ideal behaviour?

At high pressure and high temperature

At low pressure and low temperature

At low pressure and high temperature

At high pressure and low temperature

At high pressure and high temperature

Vapour pressure of solution containing 2 mol of liquid \[A(P_{A}^{0}=80torr)\]and 3 mol of liquid \[B(P_{B}^{0}=100torr)\]is 87 torr. We can conclude that

there is negative deviation from Raoult's law

boiling point is higher than that expected for ideal solution

molecular attractions between unlike molecules are stronger than those between like molecules

All of these statements are correct

1187 + Mcqs in Chemistry in NEET Page 2 McqOptions

51.	Given Reaction Energy Change (in KJ) \[Li\left( s \right)\to Li\left( g \right)\] 161 \[Li\left( g \right)\to L{{i}^{+}}\left( g \right)\] 520 \[\frac{1}{2}{{F}_{2}}(g)\to F(g)\] 77 \[F\left( g \right)+{{e}^{-}}\to {{F}^{-}}\left( g \right)\] Electron gain enthalpy \[L{{i}^{+}}(g)+{{F}^{-}}(g)\to LiF(s)\] -1047 \[Li(s)+\frac{1}{2}{{F}_{2}}(g)\to LiF(s)\] -617 Based on data provided, the value of electron gain enthalpy of fluorine would be:
A.	\[-300\,kJ\,mo{{l}^{-1}}\]
B.	\[-350kJ\,mo{{l}^{-1}}\]
C.	\[-328\text{ }kJ\text{ }mo{{l}^{-1}}\]
D.	\[-228\text{ }kJ\text{ }mo{{l}^{-1}}\]
Answer» D. \[-228\text{ }kJ\text{ }mo{{l}^{-1}}\]

Discussion

52.	Which of the following is correct set of physical properties of the geometrical isomers?
A.	Dipole momentB.P.M.P.StabilityI>III>IIII>II>II
B.	Dipole momentB.P.M.P.StabilityII>III>III>III>I
C.	Dipole momentB.P.M.P.StabilityI>III>III>III>II
D.	Dipole momentB.P.M.P.StabilityII>III>II>III>II
Answer» D. Dipole momentB.P.M.P.StabilityII>III>II>III>II

Discussion

53.	By how many folds the temperature of a gas would increase when the root mean square velocity of the gas molecules in a container of fixed volume is increased from \[5\times {{10}^{4}}cm/s\] to \[10\times {{10}^{4}}cm/s\]?
A.	Two
B.	Three
C.	Six
D.	Four
Answer» E.

Discussion

54.	Which of the following statements regarding difference between adsorption and absorption is incorrect?
A.	Adsorption is a surface whereas absorption is a bulk phenomena.
B.	Water vapours are absorbed by anhydrous \[CaC{{l}_{2}}\] but adsorbed by silica gel.
C.	Adsorption and absorption take place individually. They can not occur simultaneously.
D.	All of the above statements are correct.
Answer» D. All of the above statements are correct.

Discussion

55.	The alcohol product(s) of the reduction of 2-methyl-3-pentanone with \[LiAl{{H}_{4}}\] is (are)
A.	a single enantiomer
B.	racemic mixture
C.	two diastereoisomers
D.	two structural isomers
Answer» C. two diastereoisomers

Discussion

56.	What is the normal boiling point of mercury? Given: \[\Delta H_{f}^{{}^\circ }\left( Hg,l \right)=0;\text{ }S{}^\circ \left( Hg,l \right)=77.4\text{ }J/K\]-mol \[\Delta H_{f}^{{}^\circ }\left( Hg,g \right)=60.8\text{ }kJ/mol;\text{ }S{}^\circ \left( Hg,g \right)=174.4J/K-mol\]
A.	624.8 K
B.	626.8 K
C.	636.8 K
D.	None of these
Answer» C. 636.8 K

Discussion

57.	If \[KMn{{O}_{4}}\] is reduced by oxalic acid in an acidic medium then oxidation number of Mn changes from
A.	4 to 2
B.	6 to 4
C.	+7 to+2
D.	7 to 4
Answer» D. 7 to 4

Discussion

58.	When condensation product of hexamethyiene- diamine and adipic acid is heated to 525 K in an atmosphere of nitrogen for about 4-5 hours, the product obtained is
A.	solid polymer of nylon 6, 6
B.	liquid polymer of nylon 6, 6
C.	gaseous polymer of nylon 6, 6
D.	liquid polymer of nylon 6
Answer» C. gaseous polymer of nylon 6, 6

Discussion

59.	What is the energy gap between valence band and conduction band in crystal of insulators?
A.	Both the bands are overlapped with each other
B.	Very small
C.	Infinite
D.	Very large
Answer» E.

Discussion

60.	A metal M and its compound can give the following observable changes in a consequence of reactions
A.	Mg
B.	Pb
C.	Zn
D.	Sn
Answer» D. Sn

Discussion

61.	The protecting power of lyophilic colloidal sol is expressed in terms of:
A.	coagulation value
B.	gold number
C.	critical miscelle concentration
D.	oxidation number
Answer» C. critical miscelle concentration

Discussion

62.	How many effective \[N{{a}^{+}}\] and \[C{{l}^{-}}\] ions are present respectively in a unit cell of \[NaCl\] solid (Rock salt structure) if all ions along line connecting opposite face centres are absent?
A.	3, 3
B.	\[\frac{7}{2},4\]
C.	\[\frac{7}{2},\frac{7}{2}\]
D.	\[4,\frac{7}{2}\]
Answer» B. \[\frac{7}{2},4\]

Discussion

63.	Zinc and mercury do not show variable valency like d-block element because
A.	they are soft.
B.	their d-shells are complete.
C.	they have only two electrons in the outermost shell.
D.	their d-shells are incomplete.
Answer» C. they have only two electrons in the outermost shell.

Discussion

64.	For the auto-ionization of water at \[25{}^\circ C,\] \[{{H}_{2}}O(l)\rightleftharpoons {{H}^{+}}(aq)+O{{H}^{-}}(aq)\] equilibrium constant is \[{{10}^{-14}}\]. What is \[\Delta G{}^\circ \] for the process?
A.	\[\simeq 8\times {{10}^{4}}J\text{ }mo{{l}^{-1}}\]
B.	\[\simeq 3.5\times {{10}^{4}}Jmo{{l}^{-1}}\]
C.	\[\simeq 2\times {{10}^{4}}Jmo{{l}^{-1}}\]
D.	None of these
Answer» B. \[\simeq 3.5\times {{10}^{4}}Jmo{{l}^{-1}}\]

Discussion

65.	Temperature of 5 moles of a gas is decreased by 2K at constant pressure. Indicate the correct statement
A.	Work done by gas is = 5 R
B.	Work done over the gas is = 10 R
C.	Work done by the gas = 10 R
D.	Work done =0
Answer» C. Work done by the gas = 10 R

Discussion

66.	The enthalpy of neutralisation of \[N{{H}_{4}}OH\]and \[C{{H}_{3}}COOH\] is \[-10.5\text{ }kcal\text{ }mo{{l}^{-1}}\] and enthalpy of neutralisation of \[C{{H}_{3}}COOH\] with strong base is\[-12.5\,kcal\text{ }mo{{l}^{-1}}\]. The enthalpy of ionisation of \[N{{H}_{4}}OH\] will be
A.	\[3.2\text{ }kcal\text{ }mo{{l}^{-1}}\]
B.	\[2.0\text{ }kcal\text{ }mo{{l}^{-1}}\]
C.	\[3.0\text{ }kcal\text{ }mo{{l}^{-1}}\]
D.	\[4.0\text{ }kcal\text{ }mo{{l}^{-1}}\]
Answer» C. \[3.0\text{ }kcal\text{ }mo{{l}^{-1}}\]

Discussion

67.	The observed osmotic pressure for a 0.10 M solution of \[Fe{{(N{{H}_{4}})}_{2}}{{(S{{O}_{4}})}_{2}}\,at\,25{}^\circ C\] is 10.8 atm. The experimental (observed) value of van't Hoff factor will be: \[\left( R=0.082\text{ }L\text{ }atm\text{ }{{k}^{-1}}mo{{l}^{-1}} \right)\]
A.	4.42
B.	4
C.	3.42
D.	5.42
Answer» B. 4

Discussion

68.	The ionic radii of \[{{X}^{+}}\] and \[{{Y}^{-}}\] ions are 146 and 216 pm respectively. The probable type of structure shown by it is
A.	\[CsCl\] type
B.	Rock salt type
C.	Zinc blende type
D.	\[Ca{{F}_{2}}\] type
Answer» C. Zinc blende type

Discussion

69.	The density of gold is\[19\text{ }g/c{{m}^{3}}\]. If \[1.9\times {{10}^{-4}}g\] of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, then the number of gold particles per \[m{{m}^{3}}\] of the sol will be:
A.	\[1.9\times {{10}^{12}}\]
B.	\[6.3\times {{10}^{14}}\]
C.	\[6.3\times {{10}^{10}}\]
D.	\[2.4\times {{10}^{6}}\]
Answer» E.

Discussion

70.	Densities of two gases are in the ratio 1:2 and their temperatures are in the ratio 2:1 then the ratio of their respective pressures is
A.	1:1
B.	1:2
C.	2:1
D.	0.167361111111111
Answer» B. 1:2

Discussion

71.	Cyclopropane and oxygen at partial pressures 170 torr and 570 torr respectively are mixed in a gas cylinder. What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen \[(n{{C}_{3}}{{H}_{6}}/n{{O}_{2}})\]
A.	\[\frac{170\times 42}{570\times 32}=0.39\]
B.	\[\frac{170}{42}/\left( \frac{170}{42}+\frac{570}{32} \right)\approx 0.19\]
C.	\[\frac{170}{740}=0.23\]
D.	\[\frac{170}{570}=0.30\]
Answer» E.

Discussion

72.	The mass average molecular mass & number average molecular mass of a polymer are 40,000 and 30,000 respectively. The polydispersity index of polymer will be
A.	<1
B.	>1
C.	1
D.	0
Answer» C. 1

Discussion

73.	Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A
A.	B evaporates more readily than A
B.	B evaporates less readily than C
C.	A and B evaporates at the same rate
D.	A evaporates more readily than C
Answer» E.

Discussion

74.	Arrange in the order of increasing acidity.
A.	\[III<I<II\]
B.	\[I<III<II\]
C.	\[III<II<I\]
D.	\[II<I<III\]
Answer» E.

Discussion

75.	Edge length of a cube is 400 pm. Its body diagonal would be
A.	500 pm
B.	566 pm
C.	600 pm
D.	693 pm
Answer» E.

Discussion

76.	How many unit cells are present in 5.0 gm of crystal AB (formula mass of AB = 40) having rock salt type structure? (\[{{N}_{A}}\]= Avogadro's no.)
A.	\[{{N}_{A}}\]
B.	\[\frac{{{N}_{A}}}{10}\]
C.	\[4{{N}_{A}}\]
D.	none of these
Answer» E.

Discussion

77.	The IUPAC name of the compound is
A.	1, 2-Propoxide
B.	Propylene oxide
C.	1, 2-Oxo propane
D.	1, 2-Epoxy propane
Answer» E.

Discussion

78.	Which of the following oxides of manganese is amphoteric?
A.	\[Mn{{O}_{2}}\]
B.	\[M{{n}_{2}}{{O}_{3}}\]
C.	\[M{{n}_{2}}{{O}_{7}}\]
D.	\[MnO\]
Answer» B. \[M{{n}_{2}}{{O}_{3}}\]

Discussion

79.	Which one of the following sets forms the biodegradable polymer?
A.	\[C{{H}_{2}}=CH-CN\] and \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]
B.	\[{{H}_{2}}N-C{{H}_{2}}-COOH\] and \[{{H}_{2}}N-{{(C{{H}_{2}})}_{5}}-COOH\]
C.	\[HO-C{{H}_{2}}-C{{H}_{2}}-OH\] and
D.	and \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]
Answer» C. \[HO-C{{H}_{2}}-C{{H}_{2}}-OH\] and

Discussion

80.	The reaction, \[2{{H}_{2}}O\left( l \right)\to 4{{H}^{+}}\left( aq \right)+{{O}_{2}}\left( g \right)+4{{e}^{-}}\] is
A.	an oxidation reaction
B.	a reduction reaction
C.	a redox reaction
D.	a hydrolysis reaction
Answer» E.

Discussion

81.	The blue complex formed on addition of cone. \[N{{H}_{4}}OH\] solution to a \[C{{u}^{2+}}\] salt solution has the structure?
A.	\[{{[Cu{{(N{{H}_{4}})}_{4}}]}^{2+}}\]
B.	\[{{[Cu{{(N{{H}_{3}})}_{2}}]}^{2+}}\]
C.	\[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\]
D.	\[{{[Cu{{(N{{H}_{4}})}_{2}}]}^{2+}}\]
Answer» D. \[{{[Cu{{(N{{H}_{4}})}_{2}}]}^{2+}}\]

Discussion

82.	A crystal lattice with alternate positive and negative ions has radius ratio 0.524. Its co-ordination number is
A.	4
B.	3
C.	6
D.	12
Answer» D. 12

Discussion

83.	A detergent \[({{C}_{12}}{{H}_{25}}SO_{4}^{-}N{{a}^{+}})\] solution becomes a colloidal sol at a concentration of\[{{10}^{-3}}M\]. Onan average \[{{10}^{13}}\] colloidal particles are present in \[1\text{ }m{{m}^{3}}\]. What is the average number of ions which are contained by one colloidal particle (micelle)? [Given: \[{{N}_{A}}=6\times {{10}^{23}}mo{{l}^{-1}}\]]
A.	\[6\times {{10}^{7}}\]
B.	10
C.	60
D.	None of these
Answer» D. None of these

Discussion

84.	The polymer used for optical lenses is :
A.	polypropylene
B.	polyvinyl chloride
C.	polythene
D.	polymethyl methacrylate
Answer» E.

Discussion

85.	Fog is a colloidal solution of
A.	solid particles dispersed in gas
B.	solid particles dispersed in a liquid
C.	liquid particles dispersed in gas
D.	gaseous particles dispersed in a liquid
Answer» D. gaseous particles dispersed in a liquid

Discussion

86.	The correct statement for both the processes of physisorption and chemisorption is
A.	both are endothermic
B.	chemisorption is endothermic but physisorption is exothermic
C.	both are exothermic
D.	physisorption is endothermic but chemisorption is exothermic.
Answer» D. physisorption is endothermic but chemisorption is exothermic.

Discussion

87.	Which observation(s) reflect(s) colligative properties? (i) A 0.5 m \[NaBr\] solution has a higher vapour pressure than a 0.5 m \[BaC{{l}_{2}}\]solution at the same temperature(ii) Pure water freezes at the higher temperature than pure methanol(iii) A 0.1 m \[NaOH\]solution freezes at a lower temperature than pure waterChoose the correct answer from the codes given below
A.	(i), (ii) and (iii)
B.	(i) and (ii)
C.	(ii) and (iii)
D.	(i) and (iiii)
Answer» E.

Discussion

88.	Which of the following value of \[{{\Delta }_{f}}{{H}^{{}^\circ }}\] represent that the product is least stable?
A.	\[-94.0\text{ }kcal\text{ }mo{{l}^{-1}}\]
B.	\[-231.6\text{ }kcal\text{ }mo{{l}^{-1}}\]
C.	\[+21.4\text{ }kcal\text{ }mo{{l}^{-1}}\]
D.	\[+64.8\text{ }kcal\text{ }mo{{l}^{-1}}\]
Answer» E.

Discussion

89.	Hydrogen has an ionisation energy of \[1311\text{ }kJ\text{ }mo{{l}^{-1}}\] and for chlorine it is \[1256\text{ }kJ\text{ }mo{{l}^{-1}}.\] Hydrogen forms \[{{H}^{+}}\left( aq \right)\] ions but chlorine does not form \[C{{l}^{+}}(aq)\] ions because
A.	\[{{H}^{+}}\] has lower hydration enthalpy
B.	\[C{{l}^{+}}\]has lower hydration enthalpy
C.	\[Cl\] has high electron affinity
D.	\[Cl\] has high electronegativity
Answer» C. \[Cl\] has high electron affinity

Discussion

90.	On mixing 3 g of non - volatile solute in 200 mL of water, its boiling point \[\left( 100{}^\circ \right)\] becomes \[100.52{}^\circ C.\] If \[{{K}_{b}}\] for water is 0.6 K/m then molecular wt. of solute is:
A.	\[10.5g\,\,mo{{l}^{-1}}\]
B.	\[12.6g\,\,mo{{l}^{-1}}\]
C.	\[15.7\,g\,\,mo{{l}^{-1}}\]
D.	\[17.3\,g\,\,mo{{l}^{-1}}\]
Answer» E.

Discussion

91.	The molar entropies of HI (g) and I (g) at 298 K are 206.5, 114.6, and \[180.7\text{ }J\text{ }mo{{l}^{-1}}{{K}^{-1}}\] respectively. Using the\[\Delta G{}^\circ \]given Below, calculate the bond energy of HI. \[HI\left( g \right)\xrightarrow{{}}H\left( g \right)+I\left( g \right);\text{ }\Delta G{}^\circ =271.8\text{ }kJ\]
A.	\[282.4\text{ }kJmo{{l}^{-1}}\]
B.	\[298.3\text{ }kJmo{{l}^{-1}}\]
C.	\[290.1\text{ }kJmo{{l}^{-1}}\]
D.	\[315.4\text{ }kJmo{{l}^{-1}}\]
Answer» C. \[290.1\text{ }kJmo{{l}^{-1}}\]

Discussion

92.	What is the value of X in \[{}^\circ C\] for given volume vs temperature curve?
A.	\[0{}^\circ C\]
B.	\[273.15{}^\circ C\]
C.	\[-273.15{}^\circ C\]
D.	\[300{}^\circ C\]
Answer» D. \[300{}^\circ C\]

Discussion

93.	Air entering the lungs ends up in tiny sacs called alveoli. From the alveoli, the oxygen diffuses into the blood. The average radius of the alveoli is 0.0050 cm and the air inside contains 14 per cent oxygen. Assuming that the pressure in the alveoli is 1.0 atm and the temperature is \[37{}^\circ C\], calculate the number of oxygen molecules in one of the alveoli,
A.	\[6\times {{10}^{13}}\]
B.	\[{{10}^{24}}\]
C.	\[1.7\times {{10}^{22}}\]
D.	\[1.7\times {{10}^{12}}\]
Answer» E.

Discussion

94.	Which of the following is not formed when \[{{H}_{2}}S\] reacts with acidic \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution?
A.	\[CrS{{O}_{4}}\]
B.	\[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
C.	\[{{K}_{2}}S{{O}_{4}}\]
D.	S
Answer» B. \[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]

Discussion

95.	Given: \[XN{{a}_{2}}HAs{{O}_{3}}+YNaBr{{O}_{3}}+ZHCl\to \] \[NaBr+{{H}_{3}}As{{O}_{4}}+NaCl\] The values of X, Y and Z in the above redox reaction are respectively:
A.	2, 1, 2
B.	2, 1, 3
C.	3, 1, 6
D.	3, 1, 4
Answer» D. 3, 1, 4

Discussion

96.	The adsorption of a gas on a solid surface varies with pressure of the gas in which of the following manner.
A.	Fast \[\to \] slow \[\to \] independent of the pressure
B.	Slow \[\to \] fast \[\to \] independent of the pressure
C.	Independent of the pressure \[\to \] fast \[\to \] slow
D.	Independent of the pressure \[\to \] slow \[\to \] fast
Answer» B. Slow \[\to \] fast \[\to \] independent of the pressure

Discussion

97.	When does a gas deviate the most from its ideal behaviour?
A.	At low pressure and low temperature
B.	At low pressure and high temperature
C.	At high pressure and low temperature
D.	At high pressure and high temperature
Answer» D. At high pressure and high temperature

Discussion

98.	If a polythene sample contains two monodisperse fractions in the ratio 2 : 3 with degree of polymerization 100 and 200, respectively, then its weight average molecular weight will be:
A.	4900
B.	4600
C.	4300
D.	5200
Answer» B. 4600

Discussion

99.	Vapour pressure of solution containing 2 mol of liquid \[A(P_{A}^{0}=80torr)\]and 3 mol of liquid \[B(P_{B}^{0}=100torr)\]is 87 torr. We can conclude that
A.	there is negative deviation from Raoult's law
B.	boiling point is higher than that expected for ideal solution
C.	molecular attractions between unlike molecules are stronger than those between like molecules
D.	All of these statements are correct
Answer» E.

Discussion

100.	Which substance serves as reducing agent in the following reaction? \[14{{H}^{+}}+C{{r}_{2}}O_{7}^{2-}+3Ni\xrightarrow{{}}\] \[2C{{r}^{3+}}+7{{H}_{2}}O+3N{{i}^{2+}}\]
A.	\[{{H}_{2}}O\]
B.	Ni
C.	\[{{H}^{+}}\]
D.	\[C{{r}_{2}}O_{7}^{2-}\]
Answer» C. \[{{H}^{+}}\]

Discussion

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