Question

give me answer i have. a doubt and it is old paper​

Answer 1

Answer:

if my answer is best mark me brainliest

Explanation:

A) reaction of p and q is exothermic

B) 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