Question

Ammonia $\left(N{H}_3\right)$ obtained from different sources always has same proportion of Nitrogen and Hydrogen. It proves the validity of law of _______________.

• A. Reciprocal proportion
• B. Constant proportion
• C. Multiple proportions
• D. None of the above

Answer 1

The correct option is B Constant proportion

The law of constant composition states that a given chemical compound always contains its component elements in a fixed ratio (by mass) and does not depend on its source and method of preparation. Nitrogen makes up about 14/17 of the mass of any sample of pure ammonia, while hydrogen makes up the remaining 3/17 of the mass. (Atomic weight of nitrogen is 14 and that of hydrogen is 1)