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Q 1. An element ( {tex} \mathrm { X } {/tex} ) forms compounds of the formula {tex} \mathrm { XCl } _ { 3 } , \mathrm { X } _ { 2 } \mathrm { O } _ { 5 } {/tex} and {tex} \mathrm { Ca } _ { 3 } \mathrm { X } _ { 2 } {/tex} but does not form {tex} \mathrm { XCl } _ { 5 } {/tex} . Which of the following is the element{tex}(\mathrm{X}){/tex}?
{tex} B {/tex}
{tex} Al {/tex}
{tex} N {/tex}
{tex} P {/tex}
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Q 2. Which of the following anions can not be formed by boron?
{tex} \mathrm { BF } _ { 6 } ^ { 3- } {/tex}
{tex} \mathrm { BH } _ { 4 } ^{-} {/tex}
{tex} \mathrm { B } ( \mathrm { OH } ) _ { 4 } ^{-} {/tex}
{tex} \mathrm {B O} _ { 2 }^{-} {/tex}
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Q 3. Which of the following would result in the formation of strongest {tex} \pi {/tex} - bond if the molecular axis is {tex} x - {/tex} axis?
{tex} 2 p _ { x } + 2 p _ { x } {/tex}
{tex} 2 p _ { y } + 2 p _ { y } {/tex}
{tex} 2 p _ { y } + 3 d _ { x y } {/tex}
{tex} 2 p _ { z } + 4 p _ { z } {/tex}
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Q 4. Which of the following statement is wrong?
{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \mathrm { dsp } ^ { 2 } {/tex} is {tex} \mathrm { d } _ { \mathrm { X } } ^ { 2 } - \mathrm { y } ^ { 2 } {/tex}
{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \mathrm { sp } ^ { 3 } \mathrm { d } {/tex} is {tex} \mathrm { d } _ { \mathrm { XY } } {/tex}
{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \mathrm { sp } ^ { 3 } \mathrm { d } ^ { 2 } {/tex} are {tex} \mathrm { d } _ { \mathrm { X } ^ { 2 } - \mathrm { Y } ^ { 2 } } {/tex} and {tex} \mathrm { d } _ { \mathrm { Z ^ {2} }} {/tex}
{tex} \mathrm { d } - {/tex} orbital taking part in {tex} \operatorname { sp } ^ { 3 } \mathrm { d } ^ { 3 } {/tex} are {tex} \mathrm { d } _ { \mathrm { XY } } , \mathrm { d } _ { \mathrm { Z ^ {2}} } {/tex} and {tex} \mathrm { d } _ { \mathrm { X ^{2}} - \mathrm { Y } ^ { 2 } } {/tex}
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Q 5. Which of the following set is not correct?
{tex} \mathrm { N } _ { 2 } \mathrm { O } , \mathrm { O } _ { 3 } , \mathrm { NH } _ { 4 } ^ { + } {/tex} all have co - ordinate bonds.
{tex} \mathrm { H } _ { 2 } \mathrm { O } , \mathrm { NO } _ { 2 } , \mathrm { ClO } _ { 2 } {/tex} all are {tex} 'V' {/tex} shape molecules.
{tex} \mathrm { I } _ { 3 } ^ { - } , \mathrm { ICl } _ { 2 } ^ { - } , \mathrm { NO } _ { 2 } ^ { + } {/tex} all are linear molecules.
{tex} \mathrm { SF } _ { 4 } , \mathrm { SiF } _ { 4 } , \mathrm { XeF } _ { 4 } {/tex} all are tetrahedral in shape.
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Q 6. The incorrect order of bond dissociation energy will be :
{tex} \mathrm { H } - \mathrm { H } > \mathrm { Cl } - \mathrm { Cl } > \mathrm { Br } - \mathrm { Br } {/tex}
{tex} \mathrm { Si } - \mathrm { Si } > \mathrm { P } - \mathrm { P } > \mathrm { Cl } - \mathrm { Cl } {/tex}
{tex} \mathrm { C } - \mathrm { C } > \mathrm { N } - \mathrm { N } > \mathrm { O } - \mathrm { O } {/tex}
{tex} \mathrm { H } - \mathrm { Cl } > \mathrm { H } - \mathrm { Br } > \mathrm { H } - \mathrm { I } {/tex}
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Q 7. The correct order of bond dissociation energy will be:
{tex} \mathrm { CO } < \mathrm { CO } _ { 2 } < \mathrm { CO } _ { 3 } ^ { 2- } \cdot ( \mathrm { C } - \mathrm { O } \text { bond } ) {/tex}
{tex} \mathrm { CN } ^ { - } < \mathrm { NCN } ^ { 2 - } < \mathrm { R } - \mathrm { CO } - \mathrm { NH } _ { 2 } ( \mathrm { C } - \mathrm { N } \text { bond } ) {/tex}
{tex} \mathrm { ClO } ^ { - } < \mathrm { ClO } _ { 2 } ^ { - } < \mathrm { ClO } _ { 3 } ^ { - } < \mathrm { ClO } _ { 4 } ^ { - } ( \mathrm { Cl } - \mathrm { O } \text { bond } ) {/tex}
{tex} \mathrm { SO } _ { 2 } < \mathrm { SO } _ { 4 } ^ { 2 - } < \mathrm { SO } _ { 3 } ^ { 2 - } ( \mathrm { S } - \mathrm { O } \text { bond } ) {/tex}
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Q 8. In which of the following change, adjacent bond angle increases?
{tex} \mathrm { BeF } _ { 2 } + 2 \mathrm { F } \rightarrow \mathrm { BeF } _ { 4 } ^ { 2 - } {/tex}
{tex} \mathrm { SiF } _ { 4 } + 2 \mathrm { F } \rightarrow \mathrm { SiF } _ { 6 } ^ { 2 - } {/tex}
{tex} \mathrm { BF } _ { 3 } + \mathrm { F } \rightarrow \mathrm { BF } _ { 4 }^{-} {/tex}
{tex} \mathrm { NH } _ { 3 } + \mathrm { H } ^ { + } \rightarrow \mathrm { NH } _ { 4 } ^ { + } {/tex}
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Q 9. In which of the following processes, the value of magnetic moment does not change?
{tex} \mathrm { N } _ { 2 } \rightarrow \mathrm { N } _ { 2 } ^ { - 2 } {/tex}
{tex} \mathrm { B } _ { 2 } \rightarrow \mathrm { B } _ { 2 } ^ { - 2 } {/tex}
{tex} \mathrm { O } _ { 2 } ^ { + } \rightarrow \mathrm { O } _ { 2 }^{-} {/tex}
{tex} \mathrm { O } _ { 2 } ^ { - } \rightarrow \mathrm { O } _ { 2 } ^ { - 2 } {/tex}
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Q 10. Which of the following pair of compounds are polar, planar and {tex}sp^{2}{/tex} hybridisation?
{tex} \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } , \mathrm { SO } _ { 2 } {/tex}
{tex} \mathrm { HClO } _ { 2 } , \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } {/tex}
{tex} \mathrm { BFClBr } , \mathrm { ClF } _ { 3 } {/tex}
{tex} \mathrm { SO } _ { 3 } , \mathrm { O } _ { 3 } {/tex}
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Q 11. In which of the following molecule {tex} 2 \mathrm { C } - 2 \mathrm { e } ^ { - } {/tex} bond is absent?
{tex} \mathrm { BeCl } _ { 2 } {/tex} in Vapor state
{tex} \mathrm { Al } _ { 2 } \mathrm { Cl } _ { 6 } {/tex}
{tex} \mathrm { BeH } _ { 2 } {/tex} in solid state
{tex} \mathrm { B } _ { 2 } \mathrm { H } _ { 6 } {/tex}
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Q 12. In which of the following {tex} \mathrm { d } - {/tex} orbital's are not used by central atom in hybridization?
{tex} \mathrm { PF } _ { 5 } ( \mathrm { s } ) {/tex}
{tex} \mathrm { PCl } _ { 5 } ( \mathrm { s } ) {/tex}
{tex} \mathrm { PBr } _ { 5 } ( \mathrm { s } ) {/tex}
{tex} \mathrm { XeF } _ { 6 } ( \mathrm { s } ) {/tex}
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Q 13. Which of the following compound produces only basic products on hydrolysis?
{tex} \mathrm { Mg } _ { 3 } \mathrm { N } _ { 2 } {/tex}
{tex} \mathrm { NCl } _ { 3 } {/tex}
{tex} \mathrm { BBr } _ { 3 } {/tex}
{tex} \mathrm { PCl } _ { 5 } {/tex}
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Q 14. Which of the following reactions is incorrect?
{tex} \mathrm { Pb } \left( \mathrm { NO } _ { 3 } \right) _ { 2 } \stackrel { \Delta } { \longrightarrow } \mathrm { PbO } _ { 2 } + \mathrm { NO } _ { 2 } + \mathrm { O } _ { 2 } {/tex}
{tex} 2 \mathrm { NaNO } _ { 3 } \stackrel { \Delta } { \longrightarrow } 2 \mathrm { NaNO } _ { 2 } + \mathrm { O } _ { 2 } {/tex}
{tex} \mathrm { Fe } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 } \stackrel { \Delta } { \longrightarrow } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } + \mathrm { SO } _ { 3 } {/tex}
{tex} 2 \mathrm { NaHCO } _ { 3 } \stackrel { \Delta } { \longrightarrow } \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } + \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { CO } _ { 2 } {/tex}
