Comparision of Valence Bond Theory and Molecular Orbital Theory
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313735 In which of the following pairs of molecules/ ions, both the species are not likely to exist?

1 \({\rm{H}}_{\rm{2}}^{\rm{ + }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
2 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
3 \({\rm{H}}_{\rm{2}}^{{\rm{2 + }}}{\rm{,H}}{{\rm{e}}_{\rm{2}}}\)
4 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313736 \({{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}\) if converted to \({\rm{O}}_{\rm{2}}^{\rm{ + }}\,\,{\rm{and}}\,\,{\rm{N}}_{\rm{2}}^{\rm{ + }}\) respectively. The incorrect statement is

1 Electron in \({{\rm{O}}_{\rm{2}}}{\mkern 1mu} {\mkern 1mu} {\rm{goes}}{\mkern 1mu} {\mkern 1mu} {\rm{form}}{\mkern 1mu} {\mkern 1mu} {\rm{\pi }}_{{\rm{2}}{\mkern 1mu} {\mkern 1mu} {{\rm{p}}_{\rm{y}}}}^{\rm{*}}\)
2 Electron in \({{\rm{N}}_{\rm{2}}}\,\,{\rm{goes}}\,\,{\rm{from}}\,\,{{\rm{\sigma }}_{{\rm{2}}\,\,{{\rm{p}}_{\rm{z}}}}}\)
3 Bond length \({\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}} \right)^{\rm{ + }}}\)
4 Bond length \({\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}} \right)^{\rm{ + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313737 Which of the following statements is
INCORRECT?

1 Bond length of \(\mathrm{O}_{2} < \) bond length of \(\mathrm{O}_{2}^{2-}\)
2 Bond order of \(\mathrm{O}_{2}>\) bond order of \(\mathrm{O}_{2}^{2-}\)
3 Bond length of \(\mathrm{O}_{2}>\) bond length of \(\mathrm{O}_{2}^{2+}\)
4 Bond order of \(\mathrm{O}_{2}^{+} < \)bond order of \(\mathrm{O}_{2}^{2-}\)
KCET - 2023
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313738 Assertion :
Superoxides of alkali metals are paramagnetic.
Reason :
Superoxides contain the ion \({\rm{O}}_{\rm{2}}^{\rm{ - }}\) which has one unpaired electron in its anti-bonding molecular orbital.

1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313735 In which of the following pairs of molecules/ ions, both the species are not likely to exist?

1 \({\rm{H}}_{\rm{2}}^{\rm{ + }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
2 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
3 \({\rm{H}}_{\rm{2}}^{{\rm{2 + }}}{\rm{,H}}{{\rm{e}}_{\rm{2}}}\)
4 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313736 \({{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}\) if converted to \({\rm{O}}_{\rm{2}}^{\rm{ + }}\,\,{\rm{and}}\,\,{\rm{N}}_{\rm{2}}^{\rm{ + }}\) respectively. The incorrect statement is

1 Electron in \({{\rm{O}}_{\rm{2}}}{\mkern 1mu} {\mkern 1mu} {\rm{goes}}{\mkern 1mu} {\mkern 1mu} {\rm{form}}{\mkern 1mu} {\mkern 1mu} {\rm{\pi }}_{{\rm{2}}{\mkern 1mu} {\mkern 1mu} {{\rm{p}}_{\rm{y}}}}^{\rm{*}}\)
2 Electron in \({{\rm{N}}_{\rm{2}}}\,\,{\rm{goes}}\,\,{\rm{from}}\,\,{{\rm{\sigma }}_{{\rm{2}}\,\,{{\rm{p}}_{\rm{z}}}}}\)
3 Bond length \({\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}} \right)^{\rm{ + }}}\)
4 Bond length \({\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}} \right)^{\rm{ + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313737 Which of the following statements is
INCORRECT?

1 Bond length of \(\mathrm{O}_{2} < \) bond length of \(\mathrm{O}_{2}^{2-}\)
2 Bond order of \(\mathrm{O}_{2}>\) bond order of \(\mathrm{O}_{2}^{2-}\)
3 Bond length of \(\mathrm{O}_{2}>\) bond length of \(\mathrm{O}_{2}^{2+}\)
4 Bond order of \(\mathrm{O}_{2}^{+} < \)bond order of \(\mathrm{O}_{2}^{2-}\)
KCET - 2023
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313738 Assertion :
Superoxides of alkali metals are paramagnetic.
Reason :
Superoxides contain the ion \({\rm{O}}_{\rm{2}}^{\rm{ - }}\) which has one unpaired electron in its anti-bonding molecular orbital.

1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
NEET DIGITAL LIBRARY
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313735 In which of the following pairs of molecules/ ions, both the species are not likely to exist?

1 \({\rm{H}}_{\rm{2}}^{\rm{ + }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
2 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
3 \({\rm{H}}_{\rm{2}}^{{\rm{2 + }}}{\rm{,H}}{{\rm{e}}_{\rm{2}}}\)
4 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313736 \({{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}\) if converted to \({\rm{O}}_{\rm{2}}^{\rm{ + }}\,\,{\rm{and}}\,\,{\rm{N}}_{\rm{2}}^{\rm{ + }}\) respectively. The incorrect statement is

1 Electron in \({{\rm{O}}_{\rm{2}}}{\mkern 1mu} {\mkern 1mu} {\rm{goes}}{\mkern 1mu} {\mkern 1mu} {\rm{form}}{\mkern 1mu} {\mkern 1mu} {\rm{\pi }}_{{\rm{2}}{\mkern 1mu} {\mkern 1mu} {{\rm{p}}_{\rm{y}}}}^{\rm{*}}\)
2 Electron in \({{\rm{N}}_{\rm{2}}}\,\,{\rm{goes}}\,\,{\rm{from}}\,\,{{\rm{\sigma }}_{{\rm{2}}\,\,{{\rm{p}}_{\rm{z}}}}}\)
3 Bond length \({\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}} \right)^{\rm{ + }}}\)
4 Bond length \({\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}} \right)^{\rm{ + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313737 Which of the following statements is
INCORRECT?

1 Bond length of \(\mathrm{O}_{2} < \) bond length of \(\mathrm{O}_{2}^{2-}\)
2 Bond order of \(\mathrm{O}_{2}>\) bond order of \(\mathrm{O}_{2}^{2-}\)
3 Bond length of \(\mathrm{O}_{2}>\) bond length of \(\mathrm{O}_{2}^{2+}\)
4 Bond order of \(\mathrm{O}_{2}^{+} < \)bond order of \(\mathrm{O}_{2}^{2-}\)
KCET - 2023
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313738 Assertion :
Superoxides of alkali metals are paramagnetic.
Reason :
Superoxides contain the ion \({\rm{O}}_{\rm{2}}^{\rm{ - }}\) which has one unpaired electron in its anti-bonding molecular orbital.

1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
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CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313735 In which of the following pairs of molecules/ ions, both the species are not likely to exist?

1 \({\rm{H}}_{\rm{2}}^{\rm{ + }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
2 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 - }}}\)
3 \({\rm{H}}_{\rm{2}}^{{\rm{2 + }}}{\rm{,H}}{{\rm{e}}_{\rm{2}}}\)
4 \({\rm{H}}_{\rm{2}}^{\rm{ - }}{\rm{,He}}_{\rm{2}}^{{\rm{2 + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313736 \({{\rm{O}}_{\rm{2}}}\,\,{\rm{and}}\,\,{{\rm{N}}_{\rm{2}}}\) if converted to \({\rm{O}}_{\rm{2}}^{\rm{ + }}\,\,{\rm{and}}\,\,{\rm{N}}_{\rm{2}}^{\rm{ + }}\) respectively. The incorrect statement is

1 Electron in \({{\rm{O}}_{\rm{2}}}{\mkern 1mu} {\mkern 1mu} {\rm{goes}}{\mkern 1mu} {\mkern 1mu} {\rm{form}}{\mkern 1mu} {\mkern 1mu} {\rm{\pi }}_{{\rm{2}}{\mkern 1mu} {\mkern 1mu} {{\rm{p}}_{\rm{y}}}}^{\rm{*}}\)
2 Electron in \({{\rm{N}}_{\rm{2}}}\,\,{\rm{goes}}\,\,{\rm{from}}\,\,{{\rm{\sigma }}_{{\rm{2}}\,\,{{\rm{p}}_{\rm{z}}}}}\)
3 Bond length \({\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{O}}\,\,{\rm{ - }}\,\,{\rm{O}}} \right)^{\rm{ + }}}\)
4 Bond length \({\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}\,\,{\rm{ > }}\,\,{\rm{bond}}\,\,{\rm{length}}\,\,{\left( {{\rm{N}}\,\,{\rm{ - }}\,\,{\rm{N}}} \right)^{\rm{ + }}}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313737 Which of the following statements is
INCORRECT?

1 Bond length of \(\mathrm{O}_{2} < \) bond length of \(\mathrm{O}_{2}^{2-}\)
2 Bond order of \(\mathrm{O}_{2}>\) bond order of \(\mathrm{O}_{2}^{2-}\)
3 Bond length of \(\mathrm{O}_{2}>\) bond length of \(\mathrm{O}_{2}^{2+}\)
4 Bond order of \(\mathrm{O}_{2}^{+} < \)bond order of \(\mathrm{O}_{2}^{2-}\)
KCET - 2023
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313738 Assertion :
Superoxides of alkali metals are paramagnetic.
Reason :
Superoxides contain the ion \({\rm{O}}_{\rm{2}}^{\rm{ - }}\) which has one unpaired electron in its anti-bonding molecular orbital.

1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
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