The electronic configuration of the atom having maximum difference in first and second ionisation energies is _________

(a)

1s², 2s², 2p⁶, 3s¹

(b)

1s², 2s², 2p⁶, 3s²

(c)

1s², 2s², 2p⁶, 3s², 3s², 3p⁶, 4s¹

(d)

1s², 2s², 2p⁶, 3s², 3p¹

IE₁ and IE₂ of Mg are 179 and 348 kcal mol^-1 respectively. The energy required for the reaction Mg⟶ Mg²⁺ + 2e^- is ___________

(a)

+169 kcal mol^-1

(b)

- 169 kcal mol^-1

(c)

+ 527 kcal mol^-1

(d)

- 527 kcal mol^-1

Which of the following orders of ionic radii is correct?

(a)

H^- > H⁺ > H

(b)

Na⁺ > F^- > O^2-

(c)

F > O^2- > Na⁺

(d)

None of these

Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

(a)

Decreases in a period and increases along the group

(b)

Increases in a period and decreases in a group

(c)

Increases both in the period and the group

(d)

Decreases both in the period and in the group

Which of the following pairs of elements exhibit diagonal relationship?

(a)

Be and Mg

(b)

Li and Mg

(c)

Be and B

(d)

Be and Al