Assertion : O2 has higher bond length than O3.Reason: O3&nbs

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 Multiple Choice QuestionsMultiple Choice Questions

511.

Which is correct regarding size of atom?

  • N < O

  • B < Ne

  • V > Ti

  • Na > K


512.

Which of the following is not sp2 hybridised?

  • Graphite

  • Graphene

  • Fullerene

  • Dry ice


513.

Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)

  • Ti2+,3.87 B.M.

  • Cr2+, 4.90 B.M.

  • Co3+,3.87 B.M.

  • Mn2+,4.90 B.M.


514.

In Omolecule, the formal charge on the central O-atom is

  • 0

  • -1

  • -2

  • +1


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515.

Which of the following represents the correct bond order?

  • O2+<O2->O22-

  • O2->O22->O2+

  • O22->O2+>O2-

  • O2+>O2->O22-


516.

What is the oxidation number of Br in KBrO?

  • + 6

  • + 7

  • + 5

  • + 8


517.

Which ofthe following statements is incorrect?

  • Li+ has minimum degree of hydration.

  • The oxidation state of K in KO2 is + 1.

  • Na is used to make a Na/Pb alloy.

  • MgSO4 is readily soluble in water.


518.

Assertion: Co(IV) is known but Ni(IV) is not.             

Reason: Ni(IV) has d4 electronic configuration.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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519.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason: The bond length of N2 is shorter than that of oxygen.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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520.

Assertion : Ohas higher bond length than O3.

Reason: Ois paramagnetic.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


D.

If both assertion and reason are false.

The resonance forms do not show any unshared electron. Hence, O3 molecule does not show any paramagnetic properties.
Structure   O=O121pm
Bond order    2.0         1.5

The bond lenght decreases as bond order increases. Hence, bond lenght of O3 is higher than O2.


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