Question

Acid reacts with metal to form:
A. Salt & $C{{O}_{2}}$
B. Salt & water
C. Salt & ${{O}_{2}}$
D. Salt & ${{H}_{2}}$

Answer 1

Hint: The metal has a property to lose the electrons and the acid has a property to lose the proton or hydrogen. Those electrons liberated from the metals are going to accept the proton (${{H}^{+}}$) and form a gas as one of the products.

Complete answer:
- In the question it is asked that acid reacts with metal and forms which compounds as the products.
- We have to find the products when acid is going to react with metal.
- The chemical reaction of acid and a metal is as follows.
\[Metal+Acid\to Salt+{{H}_{2}}\]
- Means when a metal is going to react with an acid the compounds formed are salt and hydrogen gas.
- The salt composition is going to depend on the metal and acid.
- For example take Magnesium (Mg) as a metal and hydrochloric acid as an acid.
- The chemical reaction between them is as follows.
\[Mg+2HCl\to MgC{{l}_{2}}+{{H}_{2}}\]
- In the above reaction one mole of magnesium reacts with two moles hydrochloric acid and forms one moles of magnesium chloride (salt) and one mole of hydrogen gas as the products.
- Therefore when an acid is going to react with a metal the products are salt and hydrogen gas.

- So, the correct option is D.

Note: If the metals are reactive then only we will get salt and hydrogen gases are the products. If the metal is not reactive then we won’t get any products. The metals which don’t react with acids are called inert metals.