Assertion :Aqueous solution of the compound $C o C l_{3} .4 N H_{3}$ when treated with excess of $A g N O_{3}$ , 1 mole of $A g C l$ is precipitated. Reason: The compound $C o C l_{3} .4 N H_{3}$ has six primary valencies and one secondary valency.

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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Both Assertion and Reason are incorrect.

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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.
$C o C l_{3} .4 N H_{3}$ can be represented as $[C o (N H_{3})_{4} C l_{2}] C l$ .

$[C o (N H_{3})_{4} C l_{2}] C l$ will give two ions in the solution.

$[C o (N H_{3})_{4} C l_{2}] C l \to [C o (N H_{3})_{4} C l_{2}]^{+} + C l^{-}$

Chloride ion will react with silver ion (from silver nitrate) to form silver chloride precipitate.

$A g^{+} + C l^{-} \to A g C l ↓$

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Assertion :Aqueous solution of the compound CoCl3.4NH3 when treated with excess of AgNO3, 1 mole of AgCl is precipitated. Reason: The compound CoCl3.4NH3 has six primary valencies and one secondary valency.

Assertion :Aqueous solution of the compound $C o C l_{3} .4 N H_{3}$ when treated with excess of $A g N O_{3}$ , 1 mole of $A g C l$ is precipitated. Reason: The compound $C o C l_{3} .4 N H_{3}$ has six primary valencies and one secondary valency.