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Standard XII

Chemistry

Sigma Bond and Pi Bond

Assertion :Cu...

Question

Assertion :Cuprous ion (Cu $^{+}$ ) is colourless whereas cupric ion (Cu $^{2 +}$ ) produces blue colour in solution. Reason: Cuprous ion (Cu $^{+}$ ) has unpaired electrons while cupric ion (Cu $^{2 +}$ ) does not.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Cupric ion produces blue colour in solution due to the presence of unpaired electron $d^{9}$ (d-d transition) while cuprous ion does not have unpaired electron $d^{10}$ .

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(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
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Assertion :Cuprous ion (Cu+) is colourless whereas cupric ion (Cu2+) produces blue colour in solution. Reason: Cuprous ion (Cu+) has unpaired electrons while cupric ion (Cu2+) does not.

The correct option is C Assertion is correct but Reason is incorrectCupric ion produces blue colour in solution due to the presence of unpaired electron d9 (d-d transition) while cuprous ion does not have unpaired electron d10.

Assertion :Cuprous ion (Cu $^{+}$ ) is colourless whereas cupric ion (Cu $^{2 +}$ ) produces blue colour in solution. Reason: Cuprous ion (Cu $^{+}$ ) has unpaired electrons while cupric ion (Cu $^{2 +}$ ) does not.

The correct option is C Assertion is correct but Reason is incorrect
Cupric ion produces blue colour in solution due to the presence of unpaired electron $d^{9}$ (d-d transition) while cuprous ion does not have unpaired electron $d^{10}$ .