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Assertion: On cooling, the brown colour ...

Assertion: On cooling, the brown colour of nitrogen dioxide disappears.
Reason: On cooling, `NO_(2)` undergoes dimerisation resulting in the pairing of the odd electron in `NO_(2)`.

A

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

B

If both assertion and reason are ture, but reason is not the correct explanantion of the assertion.

C

If assertion is true, but reason is false.

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
A
Correct reason. The lone pair of electrons on the N atom is strongly attracted by the three strongly electronegative F atoms. As a result, it is not available for donation and hence `NF_(3)` is a weak ligand.
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Formula of nitrogen dioxide is NO_(2) .

why does NO_(2) dimerise?

Asseration: ClO_(2) possess old number of electrons. Reason: ClO_(2) dimerises to procvide the pairing of odd electron in it like other odd electron m olecules.

In NO_(2) molecule N atom undergoes in :

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