Reaction with Bases

Q.

The pair of amphoteric hydroxides is:

1. $\mathrm{Al}{\left[\mathrm{OH}\right]}_3,\mathrm{LiOH}$

2. $\mathrm{Be}{\left[\mathrm{OH}\right]}_2,\mathrm{Mg}{\left[\mathrm{OH}\right]}_2$

3. $\mathrm{B}{\left[\mathrm{OH}\right]}_2,\mathrm{Be}{\left[\mathrm{OH}\right]}_2$

4. $\mathrm{Be}{\left[\mathrm{OH}\right]}_2$$,$$\mathrm{Zn}{\left[\mathrm{OH}\right]}_2$

Q.

The pair of amphoteric oxides is:

1. $\mathrm{BeO}\mathrm{and}{\mathrm{BO}}_3$

2. $\mathrm{BeO}\mathrm{and}\mathrm{MgO}$

3. $\mathrm{BeO}\mathrm{and}\mathrm{ZnO}$

4. ${\mathrm{Al}}_2{\mathrm{O}}_3\mathrm{and}{\mathrm{Li}}_2\mathrm{O}$

Q.

Which of the following is an amphoteric metal?

1. Calcium

2. Iron

3. Aluminium

4. None of these

Q. Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas?
A. Cu B. Al
C. Fe D. Zn

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