Question

The question given below consists of two statements — an Assertion (labeled as A) and a Reason (labeled as R). Choose the correct answer -

A : Water is a compound.

R : In water, hydrogen and oxygen exist in the ratio of $1:8$by weight

• A. Both A and R are correct and R is the correct explanation of A.
• B. Both A and R are correct and R is not the correct explanation of A.
• C. A is correct but R is incorrect.
• D. A is incorrect but R is correct.
• E. Both A and R are incorrect.

Answer 1

The correct option is A

Both A and R are correct and R is the correct explanation of A.

Assertion: When one or more atoms of the same or different elements combine with each other chemically, a compound is formed.

Reason: Water $\left({\mathrm{H}}_2\mathrm{O}\right)$is a compound composed of two elements, hydrogen, and oxygen, which are chemically combined in a fixed proportion of $1:8$by mass
$$\begin{gathered} \mathrm{H}=1\mathrm{u},\mathrm{O}=16\mathrm{u}, \\ \mathrm{so}2\mathrm{H}:\mathrm{O} \\ =2\mathrm{u}:16\mathrm{u}, \\ =1:8 \end{gathered}$$

Both A and R are correct and R is the correct explanation of A.

Hence, Option A is the correct answer.