The reason for the small radius of Ga compared to Al is-.

a.  Poor screening effect of d and f orbitals

b.  Increase in nuclear charge

c.  Presence of higher orbitals

d.  Higher atomic number

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Match the species given in Column I with the properties mentioned in Column II.

Codes

The element which exists in a liquid state for a wide range of temperatures
and can be used for measuring high temperature is:

1. B

2. Al

3. Ga

4. In

Which of the following is a Lewis acid?

1. ${\mathrm{AlCl}}_3$

2. ${\mathrm{MgCl}}_2$

3. ${\mathrm{CaCl}}_2$

4. ${\mathrm{BaCl}}_2$

Match the species given in Column I with properties given in Column II.