Which of the following pairs can be distinguished by the action of heat?
(i) $K_{2} C O_{3}$ and $C a C O_{3}$
(ii) $N a_{2} C O_{3}$ and $M g (N O_{3})_{2}$
(iii) $M g (N O_{3})_{2}$ and $N a N O_{3}$

Only (i) and (ii)

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Only (i) and (iii)

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(i), (ii) and (iii)

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None of these

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Solution

The correct option is C (i), (ii) and (iii)
(i) $K_{2} C O_{3}$ on heating does not decompose, it just melts and $C a C O_{3} Δ - \to C a O + C O_{2}$

ii) $N a_{2} C O_{3}$ on heating does not decompose
$M g (N O_{3})_{2} Δ - \to 2 M g O + 4 N O_{2} + O_{2}$

iii) $N a N O_{3} Δ - \to N a N O_{2} + O_{2}$
$M g (N O_{3})_{2} Δ - \to 2 M g O + 4 N O_{2} + O_{2}$
$N O_{2}$ gas is brown in colour.

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Which of the following pairs can be distinguished by the action of heat? (i) K2CO3 and CaCO3 (ii) Na2CO3 and Mg(NO3)2 (iii) Mg(NO3)2 and NaNO3

The correct option is C (i), (ii) and (iii)(i) K2CO3 on heating does not decompose, it just melts and CaCO3Δ−→CaO+CO2 ii) Na2CO3 on heating does not decompose Mg(NO3)2Δ−→2MgO+4NO2+O2 iii) NaNO3Δ−→NaNO2+O2 Mg(NO3)2Δ−→2MgO+4NO2+O2 NO2 gas is brown in colour.

Which of the following pairs can be distinguished by the action of heat?
(i) $K_{2} C O_{3}$ and $C a C O_{3}$
(ii) $N a_{2} C O_{3}$ and $M g (N O_{3})_{2}$
(iii) $M g (N O_{3})_{2}$ and $N a N O_{3}$