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  4. Which of the following compounds when heated separately up to 500° C , release brown colored gas? Cu(NO3)2 Hg(NO3)2 NaNO3 AgNO3 I II III IV

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Q. Which of the following compounds when heated separately up to $500^{^\circ }C$ , release brown colored gas?
$Cu(NO_3)_2$ $Hg(NO_3)_2$ $NaNO_3$ $AgNO_3$
I II III IV

NTA AbhyasNTA Abhyas 2022

Solution:

$NO _2$ Is a brown coloured gas:
$Cu \left(NO_3\right)_2 \xrightarrow{\Delta} CuO \downarrow+2( NO )_2 \uparrow+\frac{1}{2} O _2 \uparrow$
$Hg \left(NO _3\right)_2 \rightarrow Hg \downarrow+2( NO )_2 \uparrow+O_2 \uparrow $
$NaNO_3 \xrightarrow[\text{below}\,500^{\circ}C]{\Delta}\times NaNO $
$AgNO \xrightarrow{\Delta} Ag \downarrow+\frac{1}{2} O _2 \uparrow$