In each of the following questions, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer.

Assertion (A): If 30 mL of $H_2$ and 20 mL of $O_2$ react to form water, 5 mL of $H_2$ is left at the end of the reaction.
Reason (R): $H_2$ is the limiting reagent.

Q.

In each of the following questions, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer.

Assertion (A): If 30 mL of $H_2$ and 20 mL of $O_2$ react to form water, 5 mL of $H_2$ is left at the end of the reaction.
Reason (R): $H_2$ is the limiting reagent.

Q. For the following question, an assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer.
Assertion (A): $N(Si{H}_3{)}_3$ is a weaker base than $N(C{H}_3{)}_3$.
Reason (R): Due to pπ-pπ back bonding in $N(Si{H}_3{)}_3$, the availability of electrons on the $N$ atom in $N(Si{H}_3{)}_3$ decreases.

Q.

In each of the following questions, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer.

Assertion (A): If 30 mL of $H_2$ and 20 mL of $O_2$ react to form water, 5 mL of $H_2$ is left at the end of the reaction.
Reason (R): $H_2$ is the limiting reagent.

Q.

In this question, an Assertion (A) is followed by a corresponding Reason (R). Choose the appropriate option.

Assertion (A): In $CsCl$ crystal, the coordination number of $C{s}^{\oplus }$ ion is 8.

Reason (R): $C{l}^{\ominus }$ ions in $CsCl$ adopt bcc type of packing.

Q.

This question consists of two statements,namely,Assertion (A) and Reason (R).For selecting the correct answer,use the following code:

(a) Both Assertion (A) and Reason (R) are true and Reason (R) correct explanation of Assertion (A).

(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

The correct answer is :(a) /(b) /(c) /(d)