Assertion : ${C u}^{+}$ is less stable than ${C u}^{2 +}$ but ${F e}^{3 +}$ is more stable than ${F e}^{2 +}$ . Reason: Half filled and completely filled subshells are more stable.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Half filled and completely filled subshells are more stable.
$F e^{3 +}$ with $3 d^{5}$ electronic configuration contains half filled 3d orbital and is more stable whereas
$F e^{2 +}$ with $3 d^{4}$ electronic configuration is less stable.
However $C u^{2 +}$ with $3 d^{9}$ electronic configuration is more stable than $C u^{+}$ with $3 d^{10}$ electronic configuration.
This is because electrode potential is more significant in determining stable oxidation state than electronic configuration.
The standard electrode potential for $C u^{2 +} / C u$ is lower than the standard electrode potential for $C u^{+} / C u$
Thus, Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

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Q. ASSERTION:

Δ_{f} H^{o}

for white phosphorus has been taken to be zero, whereas black phosphorus is the most stable allotrope of phosphorus and this is the only exception.

REASON:
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Assertion (A) Bond angle in ethers is slightly less than the tetrahedral angle.
Reason (R) There is a repulsion between the two bulky (- R) groups.
(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.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :Cu+ is less stable than Cu2+ but Fe3+ is more stable than Fe2+. Reason: Half filled and completely filled subshells are more stable.

Assertion : ${C u}^{+}$ is less stable than ${C u}^{2 +}$ but ${F e}^{3 +}$ is more stable than ${F e}^{2 +}$ . Reason: Half filled and completely filled subshells are more stable.