Question

which gas is usually liberated when an acid react with a metal ? illustrate with an example .How will you test for the presence of this gas​

Answer 1

Answer:

sQ6. Mention the role of chlorophyll in photosynthesis.Q4. Write a short note on tooth decay?

Answer 2

when acid reacts with a metal, it liberates hydrogen gas.

For example,

Na+Hcl----->NaCl+h2

presence of hydrogen gas is tested by bringing a burning candle near the gas. hydrogen produces popping sound when in contact with flame.