Question

Two substances A and B when bought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. the substance C is​

Answer 1

Since the substance R is a mixture of two substances, it may either be a mixture or a compound

In a mixture the constituents retain their properties while in a compound, they lose their properties.

Since the question mentions that R has different property from both P and Q, hence it must be a compound