Reaction of Metallic Oxides and Hydroxides with Acids

Q.

(a) Name three acids used in the laboratory.

(b) Name one indicator that turns red on adding a base.

(c) Name the reaction when an acid is mixed with a base.

(d) Write the name of two indicators that occur naturally.

(e) Name three types of salts. Give one example of each type of salt.

Q.

Analyze the reaction given below and identify the salt formed.
$\text{FeO (aq) + HCl (aq)}\to {\text{Salt + H}}_2\text{O (l)}$

1. $\text{FeO}$
2. ${\text{FeCl}}_2$
3. ${\text{Fe}}_2{\text{O}}_3$
4. ${\text{FeSO}}_4$

Q. When $C{O}_2$ is passed through lime water, it turns milky. The milkiness is due to the formation of:

1. $CaC{O}_3$
2. $C{O}_2$
3. $H_{2}O$
4. $Ca(OH{)}_2$

Q.

Acid + base $\to$ X + Y;

What is X and Y respectively?

1. +

2. Salt +

3. Salt + ​

4. +

Q. $Cu+{xHNO}_3\to Cu{\left({NO}_3\right)}_y+{2H}_{2}O+2{NO}_2$
Find the value of x and y.

1. $x=4,y=2$
2. $x=2,y=2$
3. $x=2,y=4$
4. $x=2,y=1$

Q. Balance the reaction of copper sulphide with dilute hydrochloric acid.

1. ${Cu}_{2}S+2HCl\to 2CuCl+H_{2}S$
2. ${Cu}_{2}S+HCl\to CuCl+H_{2}S$
3. ${Cu}_{2}S+HCl\to {CuCl}_2+H_2+S$
4. $2{Cu}_{2}S+2HCl\to 2{CuCl}_2+S_2+H_{2}S$