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. $\mathrm{H}\to {\mathrm{H}}^{-}$

Which of the following electronic configuration represents a sudden large gap between the values of second and third ionisation energies of an element?

Element having highest I.P value is :

1. Ne

2. He

3. Be

4. N

Which of the following atomic species has maximum ionisation energy?

1. O^-

2. S^-

3. Se^-

4. Te^-

Which of the following arrangements shows the correct order of decreasing paramagnetism?

1. N>Al>O>Ca

2. N>O>Al>Ca

3. O>N>Al>Ca

4. O>N>Ca>Al