Question

Give the characteristic test for ${H_2}$ gas.
A. Burning candle test
B. Lime water test
C. Chromate test
D. None of these

Answer 1

While giving the answer, consider the amphoteric nature of metals. Amphoteric oxides are those oxides which can act as an acid or base, in a reaction to produce gas. If hydrogen burns mean it goes under some chemical reaction.

Complete step by step answer:
When we say that hydrogen is burning, it’s actually undergoing a chemical reaction. In this chemical reaction hydrogen combines with oxygen to sort water and releases a lot of energy.
A lot of warmth is released into the gaseous mixture and therefore the air adjacent there expands very quickly. And this gaseous mixture contains hydrogen, oxygen and water vapour liberated from the reaction. This rapid expandation of gas molecules causes a break of the sound barrier. And because of this explosion we hear the pop sound of hydrogen burning.
By this, we can conclude that while hydrogen is burning it’s exploding the pop sound.
From the given question, a Characteristic test for hydrogen gas can be done by burning a candle near the source of hydrogen. In this process hydrogen gas burns with the sound of a squeaky pop. So, we can characterize hydrogen by this test.

So, the correct answer is Option A.

Note: We have to remember that the hydrogen gas can be prepared in the laboratory with the help of conical flask fitted with a delivery tube. In the flask a few grams of granulated zinc are taken then dil. HCl is added to the flask and liberated hydrogen gas is collected in an inverted test tube placed in water. Hydrogen gas obtained by this procedure contains different impurities.