MCQ
In kjeldahl’s method, $CuS{O_4}$ acts as
- AOxidising agent
- BReducing agent
- CHydrolysing agent
- ✓Catalytic agent
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$(a)$ Lewis acidity order : $SiF_4 < SiC_{4} < SiBr_4 < Sil_4$
$(b)$ Melting point : $NH_3 > SbH_3 > AsH_3 > PH_3$
$(c)$ Boiling point : $NH_3 > SbH_3 > AsH_3 > PH_3$
$(d)$ Dipole moment order : $NH_3 > SbH_3 > AsH_3 > PH_3$
$X$ and $Y$ should be