Question

Non-combustible hydride is:
(A) $N{{H}_{3}}$
(B) $P{{H}_{3}}$
(C) $As{{H}_{3}}$
(D) $Sb{{H}_{3}}$

Answer 1

Hint : Combustion is a chemical reaction between different substances (mostly including oxygen) and generates heat and light as energy in the products (In the form of flame).

Complete Step By Step Answer:
The more complex form of heating is combustion and a very basic example is lighting a match stick.
Combustion is a very common phenomenon in day to day life as well as in industries or laboratories either it be sciences or professions.
Combustion is a very common chemical reaction and a culminating step in oxidation of certain substances.
There can be two types of substances namely combustible and non-combustible substances. Substances which are capable of burning in presence of air to produce heat and light are known as combustible substances and the substances which are not combustible that are not capable of burning in presence of air are called non-combustible substances. The necessary condition for burning of combustible substances is heat, fuel and air but non combustible substances won’t even burn in presence of these ingredients.
Examples of combustible substances can be diesel, petrol and kerosene and non combustible glass and stone.
The non-combustible substance among the given options is $N{{H}_{3}}$ . This is because the combustion or burning of ammonia is difficult without the presence of the catalyst which can be platinum.

Note :
The flammable range of ammonia in air is less than $16-25$ because the temperature of flames is lower than the ignition temperature of ammonia-air mixture.