List of top Physics Questions on The solid state asked in WBJEE

The coagulating power of electrolytes having ions Na$^+$, Al$^{3+$ and Ba$^{2+}$ for As$_2$S$_3$ sol increases in the order}
P and Q combine to form two compounds \( PQ_2 \) and \( PQ_3 \). If 1 g \( PQ_2 \) in 51 g benzene gives depression of freezing point \(0.8^\circ C\) and 1 g \( PQ_3 \) gives \(0.625^\circ C\). ( \(K_f = 5.1\) ). Find atomic masses of P and Q.
If three elements A, B, C crystallise in a cubic lattice with B at cube centres, C at edge centres and A at corners, the formula of the compound is