Question

Laughing gas is _______
a.) Nitrogen pentoxide
b.) Nitrous oxide
c.) Nitrogen trioxide
d.) Nitric oxide

Answer 1

Hint: To solve this question firstly we should know what a laughing gas is, the concept behind them and their medical use. We will also study the gases listed in the question. Then with our knowledge and the given information, we will approach our answer.

Complete step by step solution: Laughing gas – A gas that causes general anaesthesia. It slows down the body’s as well as brain’s responses. If the amount of drug inhaled is high, then effects are high and vice versa.
It induces feelings of euphoria, including the feelings of calmness and relaxation. Fits of laughter and giggles are also caused. Hence the name ‘Laughing Gas’.

Now let us first learn a little about the gases given in the question.

Nitrogen pentoxide used for a nitrating agent. Nitrous oxide used as an anaesthetic. Nitrogen trioxide is used in special purpose fuel. Nitric oxide is used to increase blood flow and decrease blood pressure.

Nitrous oxide is a small inorganic molecule also known as dinitrogen monoxide. Nitrogen oxide is colourless, odourless. It is a safe and effective sedative agent because it releases a pleasurable feeling it emits.

Nitrous oxide is also called as laughing gas due to the exhilarating effect of inhalation. It slows the nervous system so rational inhalation becomes slightly reduced and thinking becomes a little slower. This feeling of euphoria can cause a person to laugh. That’s why it is called laughing gas.

Nitrous oxide has various medicinal uses especially in surgery and dentistry for its anaesthetic and analgesic effect. It is also a food additive when used as a propellant for whipped cream and it is used in the automotive industry to enhance engine performance.

Hence, the correct option is B – Nitrous oxide.

Note: Nitric oxide was first discovered by the English chemist Joseph Priestly in 1772 another English chemist Humphrey Davy later named it physiological effect. A principle use of nitric oxide in surgical operation of short duration prolonged causes death. Nitric oxide is present in the atmosphere where it is used as a powerful greenhouse.