MCQ
Quartz is a crystalline variety of
- ASilicon carbide
- BSodium silicate
- ✓Silica
- DSilicon
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(At. No. $Cr = 24, Mn = 25, $$Fe = 26, Ni = 28$)
Reason : Cerium salts are used as catalyst in petroleum cracking.
$HA \to A^-+ H^+$ , $\Delta H = Z$
$H^+ + OH^-\to H_2O$, $\Delta H = X$
$HA + OH^-\to A^-+ H_2O$, $\Delta H = Y$