The ionic radii vary in :

(a)	Inverse proportion to the effective nuclear charge.
(b)	Inverse proportion to the square of effective nuclear charge.
(c)	Direct proportion to the screening effect.
(d)	Direct proportion to the square of screening effect.

Choose the correct option :

1. (a), (c)

2. (b), (c)

3. (c), (d)

4. (b), (d)

The properties among the following can be shown by the element belonging
to the 3rd period and group 13 of the periodic table:

(a) Good conductor of electricity

(b) Liquid, metallic

(c) Solid, metallic

(d) Solid, non-metallic

Choose the correct option :

1. (a), (c)

2. (b), (c)

3. (c), (d)

4. (b), (d)

The term(s), that does not have a unit among the following, is/are:

(a) Electronegativity

(b) Electron gain enthalpy

(c) Ionization enthalpy

(d) Metallic character

Choose the correct option:

1. (a) and (d)

2. (b) and (c)

3. (c) and (d)

4. (b) and (d)

In which following options of arrangement does not agree with the variation of the property indicated against it?

Choose the correct option

Given are the following sets of species:

(a) ${\mathrm{Zn}}^{2+},<mspace\; width="1em"></mspace>{\mathrm{Ca}}^{2+},<mspace\; width="1em"></mspace>{\mathrm{Ga}}^{3+},<mspace\; width="1em"></mspace>{\mathrm{Al}}^{3+}$

(b) ${\mathrm{K}}^{+},\hspace{0.17em}{\mathrm{Ca}}^{2+},<mspace\; width="1em"></mspace>{\mathrm{Sc}}^{3+},\hspace{0.17em}{\mathrm{Cl}}^{-}$

(c) ${\mathrm{P}}^{3-},<mspace\; width="1em"></mspace>{\mathrm{S}}^{2-},<mspace\; width="1em"></mspace>{\mathrm{Cl}}^{-},<mspace\; width="1em"></mspace>{\mathrm{K}}^{+}$

(d) ${\mathrm{Ti}}^{4+},<mspace\; width="1em"></mspace>\mathrm{Ar},<mspace\; width="1em"></mspace>{\mathrm{Cr}}^{3+},<mspace\; width="1em"></mspace>{\mathrm{V}}^{5+}$

The sets containing only isoelectronic ions among the above are:

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Correct statement(s) among the following are:

Choose the correct option:

1. (a), (c), (d)

2. (a), (b), (c)

3. (a), (c)

4. (a), (d)

An element(s) that gain one electron more readily in comparison to other elements of their group is/are:

(a) S_(g)

(b) Na_(g)

(c) O_(g)

(d) Cl_(g)

Choose the correct option:

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Among the following sequences, the sequence contains atomic numbers of only representative elements is/are:

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

Among the following, the elements that can show covalency greater than 4 is/are:

(a) Be

(b) P 

(c) S

(d) B

Choose the correct option

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Which one of the following elements, based on their electronic configurations, has the highest ionization enthalpy?

1. $\left[\mathrm{Ne}\right]3{\mathrm{s}}^{2}3{\mathrm{p}}^1$

2. $\left[\mathrm{Ne}\right]3{\mathrm{s}}^{2}3{\mathrm{p}}^3$

3.  $\left[\mathrm{Ne}\right]3{\mathrm{s}}^{2}3{\mathrm{p}}^2$

4.  $\left[\mathrm{Ar}\right]3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}4{\mathrm{p}}^3$