When an acid reacts with a metal, which one of the following gas is usually liberated?

When an acid reacts with a metal, which one of the following gas is usually liberated?

A. Ammonia Gas
B. Chlorine
C. Oxygen
D. Hydrogen gas

 
When metal reacts with acid, a soap bubble is formed and the bubble contains Hydrogen gas (example: HCl, H2SO4).
Hydrogen gas is liberated when anacid reacts with a metal. For example, when zin cmetal reacts with dil. hydrogen is evolved and salt zinc chloride is formed as: It can be tested bybringing a burning candle near thegas.

The valency of carbon Atom is __________ ?

The valency of carbon Atom is __________ ?

A. 1
B. 2
C. 3
D. 4

 
The valency of carbon is 4. As the atomic number of carbon is 6, it has a total of 6 electrons in one atom arranged in the following configuration. it needs to add 4 more electrons to the 2p sub-shell, or lose 4 electrons from the 2s and 2p sub-shells.