The size of particles in suspension, true solution and colloidal solution varies in the order:

true solution > suspension > colloidal

suspension > colloidal > true solution

true solution > suspension > colloidal

suspension > colloidal = true solution

\[\Delta G\] in \[A{{g}_{2}}O\to 2Ag+1/2{{O}_{2}}\] at a certain temperature is \[-10\text{ }kJ\text{ }mo{{l}^{-1}}\]. Pick the correct statement

Ag and \[{{O}_{2}}\] combines to form \[A{{g}_{2}}O\]

\[A{{g}_{2}}O\]decomposes to Ag and \[{{O}_{2}}\]

Ag and \[{{O}_{2}}\] combines to form \[A{{g}_{2}}O\]

For the combustion reaction at \[298\text{ }K\] \[2Ag\left( s \right)+1/2{{O}_{2}}\left( g \right)\xrightarrow{{}}2A{{g}_{2}}O\left( s \right)\] Which of the following alternatives is correct?

\[\Delta H\] and \[\Delta U\] has no relation with each other

First three nearest neighbour distances for body centred cubic lattice are respectively:

\[\frac{\sqrt{3}a}{2},a,\sqrt{3}a\]

\[\frac{a}{\sqrt{2}},a,\sqrt{3}a\]

\[\frac{\sqrt{3}a}{2},a,\sqrt{2}a\]

\[\frac{\sqrt{3}a}{2},a,\sqrt{3}a\]

\[\Delta H_{f}^{0}\] of water is\[-285.8\text{ }kJ\text{ }mo{{l}^{-1}}\]. If enthalpy of neutralisation of monoacidic strong base is \[-57.3\text{ }kJmo{{l}^{-1}}\]. \[\Delta H_{f}^{0}\] of \[O{{H}^{-}}\] ion will be

\[-114.25\text{ }kJ\,mo{{l}^{-1}}\]

\[114.25\text{ }kJ\text{ }mo{{l}^{-1}}\]

\[228.5\text{ }kJ\,mo{{l}^{-1}}\]

\[-228.5\text{ }kJ\text{ }mo{{l}^{-1}}\]

Which of the following is not a disproportionation reaction?

\[{{P}_{4}}+5O{{H}^{-}}\xrightarrow{{}}{{H}_{2}}PO_{2}^{-}+P{{H}_{3}}\]

\[C{{l}_{2}}+O{{H}^{-}}\xrightarrow{{}}C{{l}^{-}}+ClO\]

\[2{{H}_{2}}{{O}_{2}}\xrightarrow{{}}2{{H}_{2}}O+{{O}_{2}}\]

\[Pb{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}PbO+{{H}_{2}}{{O}_{2}}\]

Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?

\[C{{H}_{3}}-{{(C{{H}_{2}})}_{8}}-CO\overset{-}{\mathop{O}}\,\,N{{a}^{+}}\]

\[C{{H}_{3}}{{(C{{H}_{2}})}_{11}}\overset{+}{\mathop{N}}\,{{(C{{H}_{3}})}_{3}}\overset{-}{\mathop{B}}\,r\]

\[C{{H}_{3}}-{{(C{{H}_{2}})}_{13}}-OSO_{3}^{-}N{{a}^{+}}\]

\[C{{H}_{3}}{{(C{{H}_{2}})}_{15}}\overset{+}{\mathop{N}}\,{{(C{{H}_{3}})}_{3}}\overset{-}{\mathop{B}}\,r\]

The \[{{r}_{+}}/{{r}_{-}}\] ratio of \[ZnS\] is 0.402. Pick out the incorrect statements from the following?

\[ZnS\] is 4:4 coordination compound.

\[ZnS\] does not crystallize in rock salt type lattice because \[{{r}_{+}}/{{r}_{-}}\] is too small to avoid overlapping of \[{{S}^{2-}}\] ions.

\[Z{{n}^{2+}}\] ion is too small to fit precisely into the octahedral voids of \[{{S}^{2-}}\] ions.

\[Z{{n}^{2+}}\] ion is too large to fit into the octahedral voids of \[{{S}^{2-}}\] ions.

When horn silver ore is dissolved in excess of sodium cyanide solution compound formed is

\[N{{a}_{2}}\left[ Ag{{\left( CN \right)}_{3}} \right]\]

\[Na\left[ Ag{{\left( CN \right)}_{2}} \right]\]

\[N{{a}_{2}}\left[ Ag{{\left( CN \right)}_{3}} \right]\]

\[N{{a}_{4}}\left[ Ag{{\left( CN \right)}_{5}} \right]\]

A manifestation of surface tension is:

rise of liquid in a capillary tube

spherical shape of liquid drops

upward movement of water in soils

What is the decreasing order of strength of the bases \[O{{H}^{-}},NH_{2}^{-},HC\equiv {{C}^{-}}~\] and \[C{{H}_{3}}CH_{2}^{-}\]?

\[HC\equiv {{C}^{-}}>C{{H}_{3}}C{{H}_{2}}>NH_{2}^{-}>O{{H}^{-}}\]

\[C{{H}_{3}}CH_{2}^{-}>NH_{2}^{-}>HC\equiv {{C}^{-}}>O{{H}^{-}}\]

\[HC\equiv {{C}^{-}}>C{{H}_{3}}C{{H}_{2}}>NH_{2}^{-}>O{{H}^{-}}\]

\[O{{H}^{-}}>NH_{2}^{-}>HC\equiv C{{~}^{-}}>C{{H}_{3}}CH_{2}^{-}\]

\[NH_{2}^{-}>HC\equiv C{{~}^{-}}>O{{H}^{-}}>C{{H}_{3}}CH_{2}^{-}\]

In countries nearer to polar region, the roads are sprinkled with\[CaC{{l}_{2}}\]. This is

to minimise the snow present on roads

to minimise the accumulation of dust on the road

to minimise the wear and tear of the roads

Of Cr (VI) as \[C{{r}_{2}}O{{_{7}^{2-}}^{~}}\] and \[CrO{{_{4}^{2-}}^{~}}\], which is better oxidising agent?

\[Cr{{O}_{4}}^{2-}\], basic medium

\[C{{r}_{2}}{{O}_{7}}^{2-}\], basic medium

\[C{{r}_{2}}{{O}_{7}}^{2-}\], acidic medium

The correct decreasing order of oxidation number of oxygen in compounds \[Ba{{O}_{2}},{{O}_{3}},K{{O}_{2}}\] and \[O{{F}_{2}}\] is:

\[K{{O}_{2}}>O{{F}_{2}}>{{O}_{3}}>Ba{{O}_{2}}\]

\[Ba{{O}_{2}}>K{{O}_{2}}>{{O}_{3}}>O{{F}_{2}}\]

\[O{{F}_{2}}>{{O}_{3}}>K{{O}_{2}}>Ba{{O}_{2}}\]

\[K{{O}_{2}}>O{{F}_{2}}>{{O}_{3}}>Ba{{O}_{2}}\]

\[Ba{{O}_{2}}>{{O}_{3}}>O{{F}_{2}}>K{{O}_{2}}\]

For which one of the processes represented by the following equations the enthalpy (heat) change is likely to be negative

\[Cl(g)\to C{{l}^{+}}(g)+{{e}^{-}}\]

\[C{{l}^{-}}(g)+aq\to C{{l}^{-}}(aq)\]

\[Cl(g)\to C{{l}^{+}}(g)+{{e}^{-}}\]

\[C{{l}_{2}}(l)\to C{{l}_{2}}(g)\]

0.5 m solution of a complex of iron and cyanide ions has the depression of f.pt. to be 3.72 K (\[{{K}_{f}}\] For water \[=1.86\text{ }Kmola{{l}^{-1}}\]). The formula of the complex is:

\[Fe{{\left( CN \right)}_{4}}\]

The standard enthalpy of formation \[({{\Delta }_{f}}{{H}^{o}}_{298})\] for methane, \[C{{H}_{4}}\] is\[-74.9\text{ }kJ\text{ }mo{{l}^{-1}}\]. In order to calculate the average energy given out in the formation of a \[C-H\] bond from this it is necessary to know which one of the following?

The first four ionisation energies of carbon and electron affinity of hydrogen.

The dissociation energy of the hydrogen molecule, \[{{H}_{2}}\].

The first four ionisation energies of carbon.

The dissociation energy of \[{{H}_{2}}\] and enthalpy of sublimation of carbon (graphite).

The first four ionisation energies of carbon and electron affinity of hydrogen.

200 mL of an aqueous solution of a protein contains its 1.26 g. The osmotic pressure of this solution at 300 K is found to be \[2.57\times {{10}^{-3}}\] bar. The molar mass of protein will be (R = 0.083 L bar \[mo{{l}^{-1}}{{K}^{-1}}\])

\[122044g\text{ }mo{{l}^{-1}}\]

1187 + Mcqs in Chemistry in NEET Page 3 McqOptions

101.	An element having an atomic radius of 0.14 nm crystallizes in an fcc unit cell. What is the length of a side of the cell?
A.	\[0.56\text{ }nm\]
B.	\[0.24\text{ }nm\]
C.	\[0.96\text{ }nm\]
D.	\[0.4nm\]
Answer» E.

Discussion

102.	The size of particles in suspension, true solution and colloidal solution varies in the order:
A.	suspension > colloidal > true solution
B.	true solution > suspension > colloidal
C.	suspension > colloidal = true solution
D.	none of these
Answer» B. true solution > suspension > colloidal

Discussion

103.	\[\Delta G\] in \[A{{g}_{2}}O\to 2Ag+1/2{{O}_{2}}\] at a certain temperature is \[-10\text{ }kJ\text{ }mo{{l}^{-1}}\]. Pick the correct statement
A.	\[A{{g}_{2}}O\]decomposes to Ag and \[{{O}_{2}}\]
B.	Ag and \[{{O}_{2}}\] combines to form \[A{{g}_{2}}O\]
C.	Reaction is in equilibrium
D.	Reaction does not take place
Answer» B. Ag and \[{{O}_{2}}\] combines to form \[A{{g}_{2}}O\]

Discussion

104.	Which one of the following exhibits the large number of oxidation states?
A.	Ti (22)
B.	V (23)
C.	Cr (24)
D.	Mn (25)
Answer» E.

Discussion

105.	\[CsBr\] crystallises in a body centered cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs=133 and that of Br=80 amu and Avogadro number being \[6.02\times {{10}^{23}}mo{{l}^{-1}}\] the density of \[CsBr\] is
A.	\[0.425\text{ }g/c{{m}^{3}}\]
B.	\[8.5g/c{{m}^{3}}\]
C.	\[4.25\text{ }g/c{{m}^{3}}\]
D.	\[82.5\text{ }g/c{{m}^{3}}\]
Answer» C. \[4.25\text{ }g/c{{m}^{3}}\]

Discussion

106.	Which of the following gas molecules have maximum value of enthalpy of physisorption?
A.	\[{{C}_{2}}{{H}_{6}}\]
B.	Ne
C.	\[{{H}_{2}}O\]
D.	\[{{H}_{2}}\]
Answer» D. \[{{H}_{2}}\]

Discussion

107.	For the combustion reaction at \[298\text{ }K\] \[2Ag\left( s \right)+1/2{{O}_{2}}\left( g \right)\xrightarrow{{}}2A{{g}_{2}}O\left( s \right)\] Which of the following alternatives is correct?
A.	\[\Delta H=\Delta U\]
B.	\[\Delta H>\Delta U\]
C.	\[\Delta H<\Delta U\]
D.	\[\Delta H\] and \[\Delta U\] has no relation with each other
Answer» D. \[\Delta H\] and \[\Delta U\] has no relation with each other

Discussion

108.	The elevation in boiling point of a solution of 13.44 g of \[CuC{{l}_{2}}\] in 1 kg of water using the following information will be (Molecular weight of \[CuC{{l}_{2}}=134.4g\] and\[{{K}_{b}}=0.52\,Kkg\,mo{{l}^{-1}}\])
A.	0.16
B.	0.05
C.	0.1
D.	0.2
Answer» B. 0.05

Discussion

109.	0.010M solution an acid HA freezes at \[-0.0205{}^\circ C\]. If\[~{{K}_{f}}\] for water is \[1.860K\text{ }kg\text{ }mo{{l}^{-1}}\], the ionization constant of the conjugate base of the acid will be (assume \[0.010M=0.010m\])
A.	\[1.1\times {{10}^{-4}}\]
B.	\[1.1\times {{10}^{-3}}\]
C.	\[9.0\times {{10}^{-11}}\]
D.	\[9.0\times {{10}^{-12}}\]
Answer» D. \[9.0\times {{10}^{-12}}\]

Discussion

110.	Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing 0.2 Faraday electricity through an aqueous solution of potassium succinate, the total volume of gases (at both cathode and anode) at STP (1 atm and 273 K) is:
A.	8.96 L
B.	4.48 L
C.	6.72 L
D.	2.24 L
Answer» B. 4.48 L

Discussion

111.	The initial volume of a gas cylinder is 750.0 mL. If the pressure of gas inside the cylinder changes from 840.0 mm Hg to 360.0 mm Hg, the final volume the gas will be:
A.	1.750 L
B.	3.60 L
C.	4.032 L
D.	7.50 L
Answer» B. 3.60 L

Discussion

112.	First three nearest neighbour distances for body centred cubic lattice are respectively:
A.	\[\sqrt{2}a,a,\sqrt{3}a\]
B.	\[\frac{a}{\sqrt{2}},a,\sqrt{3}a\]
C.	\[\frac{\sqrt{3}a}{2},a,\sqrt{2}a\]
D.	\[\frac{\sqrt{3}a}{2},a,\sqrt{3}a\]
Answer» D. \[\frac{\sqrt{3}a}{2},a,\sqrt{3}a\]

Discussion

113.	\[\Delta H_{f}^{0}\] of water is\[-285.8\text{ }kJ\text{ }mo{{l}^{-1}}\]. If enthalpy of neutralisation of monoacidic strong base is \[-57.3\text{ }kJmo{{l}^{-1}}\]. \[\Delta H_{f}^{0}\] of \[O{{H}^{-}}\] ion will be
A.	\[-114.25\text{ }kJ\,mo{{l}^{-1}}\]
B.	\[114.25\text{ }kJ\text{ }mo{{l}^{-1}}\]
C.	\[228.5\text{ }kJ\,mo{{l}^{-1}}\]
D.	\[-228.5\text{ }kJ\text{ }mo{{l}^{-1}}\]
Answer» E.

Discussion

114.	Which one of the following is a chain growth polymer?
A.	Nucleic acid
B.	Polystyrene
C.	Protein
D.	Starch
Answer» C. Protein

Discussion

115.	If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water \[\left( \Delta {{T}_{f}} \right),\] when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is \[\left( {{K}_{f}}=1.86K\text{ }kg\text{ }mo{{l}^{-1}} \right)\]
A.	0.372 K
B.	0.0558 K
C.	0.0744 K
D.	0.0186 K
Answer» C. 0.0744 K

Discussion

116.	Vapour pressure of pure benzene is 119 torr and that of toluene is 37.0 torr at the same temperature. Mole fraction of toluene in vapour phase which is in equilibrium with a solution of benzene and toluene having a mole fraction of toluene 0.50, will be:
A.	0.137
B.	0.237
C.	0.435
D.	0.205
Answer» C. 0.435

Discussion

117.	Which of the following is not a disproportionation reaction?
A.	\[{{P}_{4}}+5O{{H}^{-}}\xrightarrow{{}}{{H}_{2}}PO_{2}^{-}+P{{H}_{3}}\]
B.	\[C{{l}_{2}}+O{{H}^{-}}\xrightarrow{{}}C{{l}^{-}}+ClO\]
C.	\[2{{H}_{2}}{{O}_{2}}\xrightarrow{{}}2{{H}_{2}}O+{{O}_{2}}\]
D.	\[Pb{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}PbO+{{H}_{2}}{{O}_{2}}\]
Answer» E.

Discussion

118.	The two compounds given below are
A.	identical
B.	enantiomers
C.	diastereo isomers
D.	regiomers
Answer» B. enantiomers

Discussion

119.	Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?
A.	\[C{{H}_{3}}-{{(C{{H}_{2}})}_{8}}-CO\overset{-}{\mathop{O}}\,\,N{{a}^{+}}\]
B.	\[C{{H}_{3}}{{(C{{H}_{2}})}_{11}}\overset{+}{\mathop{N}}\,{{(C{{H}_{3}})}_{3}}\overset{-}{\mathop{B}}\,r\]
C.	\[C{{H}_{3}}-{{(C{{H}_{2}})}_{13}}-OSO_{3}^{-}N{{a}^{+}}\]
D.	\[C{{H}_{3}}{{(C{{H}_{2}})}_{15}}\overset{+}{\mathop{N}}\,{{(C{{H}_{3}})}_{3}}\overset{-}{\mathop{B}}\,r\]
Answer» E.

Discussion

120.	The \[{{r}_{+}}/{{r}_{-}}\] ratio of \[ZnS\] is 0.402. Pick out the incorrect statements from the following?
A.	\[ZnS\] is 4:4 coordination compound.
B.	\[ZnS\] does not crystallize in rock salt type lattice because \[{{r}_{+}}/{{r}_{-}}\] is too small to avoid overlapping of \[{{S}^{2-}}\] ions.
C.	\[Z{{n}^{2+}}\] ion is too small to fit precisely into the octahedral voids of \[{{S}^{2-}}\] ions.
D.	\[Z{{n}^{2+}}\] ion is too large to fit into the octahedral voids of \[{{S}^{2-}}\] ions.
Answer» E.

Discussion

121.	When horn silver ore is dissolved in excess of sodium cyanide solution compound formed is
A.	\[AgCN\]
B.	\[Na\left[ Ag{{\left( CN \right)}_{2}} \right]\]
C.	\[N{{a}_{2}}\left[ Ag{{\left( CN \right)}_{3}} \right]\]
D.	\[N{{a}_{4}}\left[ Ag{{\left( CN \right)}_{5}} \right]\]
Answer» C. \[N{{a}_{2}}\left[ Ag{{\left( CN \right)}_{3}} \right]\]

Discussion

122.	Chloro compound of Vanadium has only spin magnetic moment of 1.73 BM. This Vanadium chloride has the formula:
A.	\[VC{{l}_{2}}\]
B.	\[VC{{l}_{4}}\]
C.	\[VC{{l}_{3}}\]
D.	\[VC{{l}_{5}}\]
Answer» C. \[VC{{l}_{3}}\]

Discussion

123.	The free energy change for the following reactions are given below, \[{{C}_{2}}{{H}_{2}}(g)+\frac{5}{2}{{O}_{2}}(g)\to \] \[2C{{O}_{2}}\left( g \right)+{{H}_{2}}O\left( l \right);\Delta G{}^\circ =-1234kJ\] \[C\left( s \right)+{{O}_{2}}\left( g \right)\to C{{O}_{2}}\left( g \right);\text{ }\Delta G{}^\circ =-394kJ\] \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to {{H}_{2}}O(l);\Delta {{G}^{{}^\circ }}=-237kJ\] What is the standard free energy change for the reaction \[{{H}_{2}}(g)+2C(s)\xrightarrow{{}}{{C}_{2}}{{H}_{2}}(g)\]
A.	\[-209\,kJ\]
B.	\[-2259\,kJ\]
C.	\[+2259\,kJ\]
D.	\[209\,kJ\]
Answer» E.

Discussion

124.	A manifestation of surface tension is:
A.	rise of liquid in a capillary tube
B.	spherical shape of liquid drops
C.	upward movement of water in soils
D.	All the above
Answer» E.

Discussion

125.	What is the decreasing order of strength of the bases \[O{{H}^{-}},NH_{2}^{-},HC\equiv {{C}^{-}}~\] and \[C{{H}_{3}}CH_{2}^{-}\]?
A.	\[C{{H}_{3}}CH_{2}^{-}>NH_{2}^{-}>HC\equiv {{C}^{-}}>O{{H}^{-}}\]
B.	\[HC\equiv {{C}^{-}}>C{{H}_{3}}C{{H}_{2}}>NH_{2}^{-}>O{{H}^{-}}\]
C.	\[O{{H}^{-}}>NH_{2}^{-}>HC\equiv C{{~}^{-}}>C{{H}_{3}}CH_{2}^{-}\]
D.	\[NH_{2}^{-}>HC\equiv C{{~}^{-}}>O{{H}^{-}}>C{{H}_{3}}CH_{2}^{-}\]
Answer» B. \[HC\equiv {{C}^{-}}>C{{H}_{3}}C{{H}_{2}}>NH_{2}^{-}>O{{H}^{-}}\]

Discussion

126.	Doping of silicon (Si) with boron leads to:
A.	n-type semiconductor
B.	p-type semiconductor
C.	Metal
D.	Insulator
Answer» C. Metal

Discussion

127.	The enthalpy of the reaction forming \[PbO\] according to the following equation is \[438\text{ }kJ\]. What heat energy (kJ) is released in formation of \[22.3g\,PbO\left( s \right)\] ? (Atomic masses: \[Pb=207,\text{ O}=16.0\]) \[2Pb\left( s \right)+{{O}_{2}}\left( g \right)\xrightarrow{{}}2PbO\left( s \right)\]
A.	21.9
B.	28.7
C.	14.6
D.	34.2
Answer» B. 28.7

Discussion

128.	The volume of 0.0168 mol of \[{{O}_{2}}\] obtained by decomposition of \[KCl{{O}_{3}}\] and collected by displacement of water is 428 mL at a pressure of 754 mm Hg at\[25{}^\circ C\]. The pressure of water vapour at \[25{}^\circ C\] is
A.	18 mmHg
B.	20 mmHg
C.	22 mmHg
D.	24 mmHg.
Answer» E.

Discussion

129.	Among \[N{{H}_{3}},HN{{O}_{3}},Na{{N}_{3}}\] and \[M{{g}_{3}}{{N}_{2}}\] the number of molecules having nitrogen in negative oxidation state is
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

130.	A reaction is spontaneous at low temperature but non-spontaneous at high temperature. Which of the following is true for the reaction?
A.	\[\Delta H>0,\,\Delta S>0\]
B.	\[\Delta H<0,\text{ }\Delta S>0\]
C.	\[\Delta H>0,\,\Delta S=0\]
D.	\[\Delta H<0,\,\Delta S<0\]
Answer» E.

Discussion

131.	Which of the following statements are correct?(i) Hydrogen bonding is a special case of dipole - dipole interaction.(ii) Energy of hydrogen bond varies between 10 to \[100kJ\text{ }mo{{l}^{-1}}\].(iii) Hydrogen bonds are powerful force in determining the structure and properties of compounds like proteins, nucleic acids etc.(iv) Strength of the hydrogen bond is determined by the coulombic interaction between the lone-pair electrons of the electronegative atom of one molecule and the hydrogen atom of other molecule.
A.	(i) and (ii)
B.	(i), (ii) and (iii)
C.	(ii), (iii) and (iv)
D.	All of these
Answer» E.

Discussion

132.	In countries nearer to polar region, the roads are sprinkled with\[CaC{{l}_{2}}\]. This is
A.	to minimise the snow present on roads
B.	to minimise pollution
C.	to minimise the accumulation of dust on the road
D.	to minimise the wear and tear of the roads
Answer» B. to minimise pollution

Discussion

133.	A compound of Xe and F is found to have 53.5% of Xe. What is oxidation number of Xe in this compound?
A.	- 4
B.	0
C.	+4
D.	6
Answer» E.

Discussion

134.	Cloud or fog is a colloidal system in which the dispersed phase and the dispersion medium are
A.	Gas, Liquid
B.	Liquid, gas
C.	Liquid, liquid
D.	Solid, Liquid
Answer» C. Liquid, liquid

Discussion

135.	Ebonite is a
A.	natural rubber
B.	synthetic rubber
C.	highly vulcanized rubber
D.	polypropene
Answer» D. polypropene

Discussion

136.	An alloy of copper, silver and gold is found to have cubic lattice in which Cu atoms constitute ccp. If Ag atoms are located at the edge centres and Au atom is present at body centre, the alloy will have the formula
A.	\[CuAgAu\]
B.	\[C{{u}_{4}}A{{g}_{4}}Au\]
C.	\[C{{u}_{4}}A{{g}_{3}}Au\]
D.	\[C{{u}_{4}}A{{g}_{6}}Au\]
Answer» D. \[C{{u}_{4}}A{{g}_{6}}Au\]

Discussion

137.	In an antifluorite structure, cations occupy
A.	octahedral voids
B.	centre of cube
C.	tetrahedral voids
D.	corners of cube
Answer» D. corners of cube

Discussion

138.	In the disproportionation reaction \[3HCl{{O}_{3}}\xrightarrow{{}}HCl{{O}_{4}}+C{{l}_{2}}+2{{O}_{2}}+{{H}_{2}}O,\] the equivalent mass of the oxidizing agent is (molar mass of \[HCl{{O}_{3}}=84.45\])
A.	16.89
B.	32.22
C.	84.45
D.	28.15
Answer» B. 32.22

Discussion

139.	Of Cr (VI) as \[C{{r}_{2}}O{{_{7}^{2-}}^{~}}\] and \[CrO{{_{4}^{2-}}^{~}}\], which is better oxidising agent?
A.	\[Cr{{O}_{4}}^{2-}\], basic medium
B.	\[C{{r}_{2}}{{O}_{7}}^{2-}\], basic medium
C.	\[C{{r}_{2}}{{O}_{7}}^{2-}\], acidic medium
D.	\[Cr{{O}_{3}}\] basic medium
Answer» D. \[Cr{{O}_{3}}\] basic medium

Discussion

140.	The correct decreasing order of oxidation number of oxygen in compounds \[Ba{{O}_{2}},{{O}_{3}},K{{O}_{2}}\] and \[O{{F}_{2}}\] is:
A.	\[Ba{{O}_{2}}>K{{O}_{2}}>{{O}_{3}}>O{{F}_{2}}\]
B.	\[O{{F}_{2}}>{{O}_{3}}>K{{O}_{2}}>Ba{{O}_{2}}\]
C.	\[K{{O}_{2}}>O{{F}_{2}}>{{O}_{3}}>Ba{{O}_{2}}\]
D.	\[Ba{{O}_{2}}>{{O}_{3}}>O{{F}_{2}}>K{{O}_{2}}\]
Answer» C. \[K{{O}_{2}}>O{{F}_{2}}>{{O}_{3}}>Ba{{O}_{2}}\]

Discussion

141.	For which one of the processes represented by the following equations the enthalpy (heat) change is likely to be negative
A.	\[C{{l}^{-}}(g)+aq\to C{{l}^{-}}(aq)\]
B.	\[Cl(g)\to C{{l}^{+}}(g)+{{e}^{-}}\]
C.	\[1/2C{{l}_{2}}(g)\to Cl(g)\]
D.	\[C{{l}_{2}}(l)\to C{{l}_{2}}(g)\]
Answer» B. \[Cl(g)\to C{{l}^{+}}(g)+{{e}^{-}}\]

Discussion

142.	0.5 m solution of a complex of iron and cyanide ions has the depression of f.pt. to be 3.72 K (\[{{K}_{f}}\] For water \[=1.86\text{ }Kmola{{l}^{-1}}\]). The formula of the complex is:
A.	\[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
B.	\[{{K}_{2}}[Fe{{(CN)}_{4}}]\]
C.	\[{{K}_{3}}[Fe{{(CN)}_{6}}]\]
D.	\[Fe{{\left( CN \right)}_{4}}\]
Answer» D. \[Fe{{\left( CN \right)}_{4}}\]

Discussion

143.	Which one of the following binary mixtures forms an azeotrope with minimum boiling point type?
A.	acetone-ethanol
B.	\[{{H}_{2}}O-HN{{O}_{3}}\]
C.	benzene-toluene
D.	n-hexane-n-heptane
Answer» B. \[{{H}_{2}}O-HN{{O}_{3}}\]

Discussion

144.	At \[20{}^\circ C\] and 1.00 atm partial pressure of \[{{H}_{2}}\], 18 mL of \[{{H}_{2}}\](STP) dissolves in 1 L of water. If 2 L of water is exposed to a gaseous mixture having a total pressure of 1425 ton- (excluding the vapour pressure of water) and containing 80% \[{{H}_{2}}\] by volume, the volume of \[{{H}_{2}}\](STP) dissolved is
A.	27 mL
B.	54 mL
C.	33.75 mL
D.	67.50 mL
Answer» C. 33.75 mL

Discussion

145.	The standard enthalpy of formation \[({{\Delta }_{f}}{{H}^{o}}_{298})\] for methane, \[C{{H}_{4}}\] is\[-74.9\text{ }kJ\text{ }mo{{l}^{-1}}\]. In order to calculate the average energy given out in the formation of a \[C-H\] bond from this it is necessary to know which one of the following?
A.	The dissociation energy of the hydrogen molecule, \[{{H}_{2}}\].
B.	The first four ionisation energies of carbon.
C.	The dissociation energy of \[{{H}_{2}}\] and enthalpy of sublimation of carbon (graphite).
D.	The first four ionisation energies of carbon and electron affinity of hydrogen.
Answer» D. The first four ionisation energies of carbon and electron affinity of hydrogen.

Discussion

146.	Which one of the following forms a molecular solid when solidified?
A.	Silicon carbide
B.	Calcium fluoride
C.	Rock salt
D.	Methane
Answer» E.

Discussion

147.	200 mL of an aqueous solution of a protein contains its 1.26 g. The osmotic pressure of this solution at 300 K is found to be \[2.57\times {{10}^{-3}}\] bar. The molar mass of protein will be (R = 0.083 L bar \[mo{{l}^{-1}}{{K}^{-1}}\])
A.	\[51022g\text{ }mo{{l}^{-1}}\]
B.	\[122044g\text{ }mo{{l}^{-1}}\]
C.	\[31011g\,mo{{l}^{-1}}\]
D.	\[61038g\,mo{{l}^{-1}}\]
Answer» E.

Discussion

148.	One mole of an ideal gas is expanded isothermally and reversibly to half of its initial pressure. \[\Delta S\] for the process in \[J\text{ }{{K}^{-1}}\text{ }mo{{l}^{-1}}\] is \[[ln2=0.693\,and\,R=8.314,J/(mol\,K)]\]
A.	6.76
B.	5.76
C.	10.76
D.	8.03
Answer» C. 10.76

Discussion

149.	Arrange (I) \[C{{e}^{3+}}\], (II) \[L{{a}^{3+}}\], (III) \[P{{m}^{3+}}\], and (IV) \[Y{{b}^{3+}}\] in increasing order of their ionic radii.
A.	IV<III<I<II
B.	I<IV<III<II
C.	IV<III<II<I
D.	III<II<I<IV
Answer» B. I<IV<III<II

Discussion

150.	At STP, a container has 1 mole of He, 2 mole Ne, 3 mole \[{{O}_{2}}\] and 4 mole\[{{N}_{2}}\]. without changing total pressure if 2 mole of \[{{O}_{2}}\] is removed. The partial pressure of \[{{O}_{2}}\] will be decreased by:
A.	26%
B.	0.4
C.	58.33%
D.	0.6666
Answer» D. 0.6666

Discussion

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