What are the materials required to prepare and test the hydrogen gas in the lab by using acid and metal ? Where do you observe the evolved hydrogen gas ?

Explanation

I) Material required to prepare and test the H2 gas are :
1) test tube. 2) delivery tube. 3) glass trough , 4) candle, 5) soap water, 6) dil. HCl, 7) Zn granuels.
2) Hydrogen gas could be observed in the soap bubbles, which are escaped from the soap water.