To check the principle of multiple proportions, a series of pure binary compounds \( (\text{P}_m\text{Q}_n) \) were analyzed and their composition is tabulated below. The correct option(s) is(are)
If empirical formula of compound \( 3 \) is \( \mathrm{P_3Q_4} \), then the empirical formula of compound \( 2 \) is \( \mathrm{P_3Q_5} \).
If empirical formula of compound \( 3 \) is \( \mathrm{P_3Q_2} \) and atomic weight of element \( \mathrm{P} \) is \( 20 \), then the atomic weight of \( \mathrm{Q} \) is \( 45 \).
If empirical formula of compound \( 2 \) is \( \mathrm{PQ} \), then the empirical formula of the compound \( 1 \) is \( \mathrm{P_5Q_4} \).
If atomic weight of \( \mathrm{P} \) and \( \mathrm{Q} \) are \( 70 \) and \( 35 \), respectively, then the empirical formula of compound \( 1 \) is \( \mathrm{P_2Q} \).
