Laughing gas has chemical composition of the following two elements which are:

(A) Nitrogen + Hydrogen
(B) Nitrogen + Carbon
(C) Nitrogen + Oxygen
(D) Oxygen + Carbon

Q. What is the chemical name of laughing gas?
(A) Nitrous oxide
(B) Nitric oxide
(C) Nitrogen dioxide
(D) None of these

Q. Nitrous oxide (laughing gas) has significant medical uses, especially in:
(A) Surgery
(B) Dentistry
(C) Both A & B
(D) None of these

Answers:
1. (C) Nitrogen + Oxygen
2. (A) Nitrous oxide
3. (C) Both A & B