The colour of hydrogen is

Dry hydrogen chloride gas does not change the colour of dry litmus paper. Why?

On burning hydrogen in air the colour of flame is

On burning hydrogen in air the colour of flame is

What is the colour of the light emitted by discharge lamp filled with hydrogen when it works ?

When hydrogen gas is bubbled through acidified KMnO_(4) , colour is not discharged. The colour of the acidified KMnO_(4) solution can be discharged by