Q. The compound that does not produce nitrogen gas by the thermal decomposition is
Solution:
$\left(\right. \left(\text{NH}\right)_{4} \left.\right)_{2} \left(\text{SO}\right)_{4} \overset{\text{Δ}}{ \rightarrow } 2 \left(\text{NH}\right)_{3} \left(\text{g}\right) \left(\text{+H}\right)_{2} \left(\text{SO}\right)_{4}$
$\text{Ba} \left(\right. \left(\text{N}\right)_{3} \left.\right)_{2} \left(\text{s}\right) \overset{\text{Δ}}{ \rightarrow } \text{Ba} + 3 \left(\text{N}\right)_{2} \left(\text{g}\right)$
$\left(\right. \left(\text{NH}\right)_{4} \left.\right)_{2} \left(\text{Cr}\right)_{2} \left(\text{O}\right)_{7} \left(\text{s}\right) \rightarrow \left(\text{N}\right)_{2} \left(\text{g}\right) + \left(\text{Cr}\right)_{2} \left(\text{O}\right)_{3} \left(\text{s}\right) + 4 \left(\text{H}\right)_{2} \text{O}$
$\left(\text{NH}\right)_{4} \left(\text{NO}\right)_{2} \overset{\text{Δ}}{ \rightarrow } \left(\text{N}\right)_{2} \left(\text{g}\right) + 2 \left(\text{H}\right)_{2} \text{O}$
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3. An organic compound contains $78 \%$ (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of $C$ is $12, H$ is $1$]
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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
[Given that molecular mass of NaOH = 40 g mol$^{-1}$]
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