Question

Assertion:
Molecular formula of water is ${\text{H}}_{\text{2}}\text{O}$
Reason:
One molecule of water contains two atom of hydrogen and one atom of Oxygen
A. Both assertion and reason are correct and reason is correct explanation for assertion.
B. Both assertion and reason are correct but the reason is not the correct explanation for assertion.
C. Assertion is correct but reason is incorrect
D. Both assertion and reason are incorrect.

Answer 1

Hint: Hint: We need to check whether the given statement is the correct reason for the assertion statement. Check the number of atoms that are contained in a molecule of water.

Complete step by step answer:
The above question is a type of assertion reasoning question.
 Assertion is a statement given to us related to any topic. In the reason we have to check whether the statement is a correct explanation of the statement given in assertion or not.
Let us look at the assertion given in the above question.
It is given that the molecular formula of water is ${\text{H}}_{\text{2}}\text{O}$, which is absolutely correct. We have studied it all over. Let us Look at the statement in the reason section. We can clearly see that the molecular formula of water, that it contains two atoms of hydrogen and one atom of Oxygen.
Hence the assertion statement is correct and the reason statement is the correct reason for the assertion according to the above discussion we come to the conclusion that
Both assertion and reason are correct and reason is the correct explanation for assertion

So, the correct answer is Option A .

Note:
Be careful, it is not necessary that the given assertion statement will always be correct. There are equal possibilities of getting any of them right or wrong. Molecular formula is always in a definite composition hence ${\text{H}}_{\text{2}}\text{O}$ is a molecular formula but if you right 2${\text{H}}_{\text{2}}\text{O}$ it will not be counted as molecular formula of water formula will always be ${\text{H}}_{\text{2}}\text{O}$.