Which property decreases from left to right across the periodic table and increases from top to bottom?

(i)	Atomic radius
(ii)	Electronegativity
(iii)	Ionisation energy
(iv)	Metallic character

Choose the correct option:
1. (i) only

2. (i), (ii) and (iii)

3. (i), (iii) and (iv)

4. (i) and (iv)

The first, second and third ionisation energies (E₁, E₂ and E₃) for an element are 7 eV, 12.5 eV and 42.5 eV respectively. The most stable oxidation state of the element will be:

1. +1

2. +4

3. +3

4. +2

The order of ionisation potential between He⁺ ion and H-atom (both species are in gaseous state) is :

1. I.P(He⁺ ) = I.P (H)

2. I.P(He⁺ ) < I.P (H)

3. I.P(He⁺ ) > I.P (H)

4. Cannot be compared

Second ionisation potential of Li, Be and B is in the order:

1. Li > Be > B

2. Li > B > Be

3. Be > Li > B

4. B > Be > Li

Which of the following isoelectronic ion has the lowest ionization energy?

1. K⁺

2. Cl^-

3. Ca²⁺

4. S^2-

Which of the following is arranged in order of increasing radius ?

1. K⁺ (aq) < Na⁺ (aq) < Li⁺(aq)

2. Na⁺(aq) < K⁺ (aq) < Li⁺ (aq)

3. K⁺(aq) < Li⁺(aq) < Na⁺(aq)

4. Li⁺(aq) < Na⁺(aq) < K⁺(aq)

Which of the following processes involves absorption of energy?

1. $\mathrm{S}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}\to {\mathrm{S}}^{-}\left(\mathrm{g}\right)$

2. ${\mathrm{S}}^{-}+{\mathrm{e}}^{-}\to {\mathrm{S}}^{2-}\left(\mathrm{g}\right)$

3. $\mathrm{Cl}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}\to {\mathrm{Cl}}^{-}\left(\mathrm{g}\right)$

4. None of the above

Arrange N, O and S in order of decreasing electron affinity:

1. S > O > N

2. O > S > N

3. N > O > S

4. S > N > O

Arrange the following elements, based on their electron configurations, in increasing order of electron affinity:

(I) $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^5$

(II) $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^3$

(III) $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^5$

(IV) $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^1$

1. II < IV < III < I

2. I < II < III < IV

3. I < III < II < IV

4. IV < III < II < I

The process requiring absorption of energy is:

1.  $\mathrm{N}\to {\mathrm{N}}^{-}$

2. $\mathrm{F}\to {\mathrm{F}}^{-}$

3. $\mathrm{Cl}\to {\mathrm{Cl}}^{-}$

4. $\mathrm{H}\to {\mathrm{H}}^{-}$