Question

To check the principle of multiple proportions, a series of pure binary compounds $\left( P _{ m } Q _{ n }\right)$ were analyzed and their composition is tabulated below. The correct option(s) is(are)

Compound	Weight % of P	Weight % of Q
1	50	50
2	44.4	55.6
3	40	60

• A. If empirical formula of compound 3 is $P _3 Q _4$, then the empirical formula of compound 2 is $P _3 Q _5$.
• B. If empirical formula of compound 3 is $P _3 Q _2$ and atomic weight of element $P$ is 20 , then the atomic weight of $Q$ is 45 .
• C. If empirical formula of compound 2 is $PQ$, then the empirical formula of the compound $1$ is $P _5 Q _4$
• D. If atomic weight of $P$ and $Q$ are 70 and 35 , respectively, then the empirical formula of compound 1 is $P _2 Q$.

Answer 1

Answer: (B), (C)

If empirical formula of compound 3 is $P _3 Q _2$ and atomic weight of element $P$ is 20 , then the atomic weight of $Q$ is 45 .

Answer 2

The correct answers are:
(B) If empirical formula of compound 3 is $P _3 Q _2$ and atomic weight of element $P$ is 20 , then the atomic weight of $Q$ is 45 .
(C) If empirical formula of compound 2 is $PQ$, then the empirical formula of the compound $1$ is $P _5 Q _4$