Which metal nitrate would give the respective metal, $N O_{2}$ and $O_{2}$ on heating?

A g N O_{3}

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C u (N O_{3})_{2}

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P b (N O_{3})_{2}

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K N O_{3}

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Solution

The correct option is D $A g N O_{3}$
All group 1 metal nitrates (except $L i N O_{3}$ ) give metal nitrite and oxygen.
$M N O_{3} Δ \to M N O_{2} + \frac{1}{2} O_{2}$
Therefore, $K N O_{3} Δ \to K N O_{2} + \frac{1}{2} O_{2}$

Among monovalent metals $A g N O_{3}$ decomposes on heating to give free metal, nitrogen dioxide and oxygen.
$2 A g N O_{3} Δ \to 2 A g + 2 N O_{2} + O_{2}$

All divalent and trivalent metals (except $H g (N O_{3})_{2}$ ) decompose on heating to give metal oxide, nitrogen dioxide and oxygen.
$C u (N O_{3})_{2} Δ \to C u O + N O_{2} + O_{2}$
$P b (N O_{3})_{2} Δ \to P b O + N O_{2} + O_{2}$

Hence, option A is correct.

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Similar questions

Priya is working on a nitrate which gives metal, $N O_{2}$ , and $O_{2}$ on heating. This nitrate is ___?

N O_{2}

N H_{4} N O_{3}, K N O_{3}, N a N O_{2}, P b (N O_{3})_{2}, A g N O_{3}

O_{2} . {N O}_{2}

M_{2} O

{NO}_{2} and O_{2}

Choose the correct answer :

(a) The nitrate salt which does not give a mixture of $N O_{2}$ and $O_{2}$ on heating is :

(i) $A g N O_{3}$ , (ii) $K N O_{3}$ ,

(iii) $C u (N O_{3})_{3}$ , (iv) $Z n (N O_{3})_{2}$ .

(b) The chemical used in the brown ring test is :

(i) $C u S O_{4}$ , (ii) $F e S O_{4}$

(iii) $F e_{2} (S O_{4})_{3}$ (iv) $Z n S O_{4}$ .

(i) NO, (ii) $N_{2} O,$

(iii) $N O_{2}$ (iv) $N_{2} O_{5}$ .

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