MCQ
In Kjeldahl's method for estimation of nitrogen, $\mathrm{CuSO}_4$ acts as :
- AReducing agent
- ✓Catalytic agent
- CHydrolysis agent
- DOxidising agent
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Reason : $NaOH$ is strong alkali.
$\left[\right.$ Use $: \mathrm{H}^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \rightarrow \mathrm{H}_{2} \mathrm{O}: \Delta_{\mathrm{\gamma}} \mathrm{H}=-57.1\, \mathrm{k} \mathrm{J} \,\mathrm{mol}^{-1}$
Specific heat of $\mathrm{H}_{2} \mathrm{O}=4.18 \mathrm{Jk}^{-} \mathrm{g}^{-}$
density of $\mathrm{H}_{2} \mathrm{O}=1.0\, \mathrm{~g} \mathrm{~cm}^{-3}$
Assume no change in volume of solution on mixing.]
