Question

Which physical properties of hydrogen gas are wrong?
A. Colourless
B. Odourless
C. Tasteless
D. Non – inflammable

Answer 1

The chemical element hydrogen has the symbol H and the atomic number $1$. Hydrogen is the lightest element in the periodic table, with an atomic weight of $1.008$. The most common chemical element in the universe is hydrogen.

Complete step by step answer:
The chemical element hydrogen has the symbol H and the atomic number 1. Hydrogen is the lightest element in the periodic table, with an atomic weight of $1.008$. The most common chemical element in the universe is hydrogen.
Hydrogen is a colourless, odourless, tasteless, inflammable gas in nature.
Hydrogen, also known as natural gas, is a clean alternative to methane. It's the most abundant chemical element, accounting for roughly $75\%$ of the universe's mass. Carbon gas, nuclear power, biogas, and alternative energy sources including solar and wind will all be used to generate hydrogen.
The words flammable and inflammable are not interchangeable. If anything, such as a piece of wood, is flammable, it can be set on fire. Inflammable, on the other hand, refers to a substance's ability to explode into flames without the need for an ignition source.
Hydrogen is a highly inflammable gas.
Hence, option D is the correct answer.

Note: Hydrogen, also known as natural gas, is a clean alternative to methane. It's the most abundant chemical element, accounting for roughly $75\%$ of the universe's mass. Carbon gas, nuclear power, biogas, and alternative energy sources including solar and wind will all be used to generate hydrogen.