Match the element in column I with that in column II.

Column-I	Column-II
(a) Copper	(i) Non-metal
(b) Fluorine	(ii) Transition metal
(c) Silicon	(iii) Lanthanoid
(d) Cerium	(iv) Metalloid

 

	(a)	(b)	(c)	(d)
1.	(ii)	(iv)	(i)	(iii)
2.	(ii)	(i)	(iv)	(iii)
3.	(iv)	(iii)	(i)	(ii)
4.	(i)	(ii)	(iii)	(iv)

Among the elements Ca, Mg, P and Cl, the correct order of increasing atomic radii is:
1. Cl < P < Mg < Ca
2. P < Cl < Ca < Mg
3. Ca < Mg < P < Cl
4. Mg < Ca < Cl < P

The value of electron gain enthalpy of Na⁺ if IE₁ of Na = 5.1 eV ,is

1. + 10.2 eV 

2. –5.1 eV

3. –10.2 eV 

4. + 2.55 eV

Which of the following oxides is most acidic in nature?

1.${\mathrm{Na}}_2\mathrm{O}$

2. MgO

3.${\mathrm{SiO}}_2$

4. ${\mathrm{Cl}}_2{\mathrm{O}}_7$

The formula for the oxide formed by Eka-aluminum is:

1. ${\mathrm{EO}}_4$

2. ${\mathrm{E}}_2{\mathrm{O}}_3$

3. ${\mathrm{E}}_3{\mathrm{O}}_2$

4. EO

In which of the following molecule, the internuclear distance will be maximum:
1. CsI
2. CsF
3. LiF
4. LiI

The first ionization potential of Be and B will be:

1.  8.8 and 8.8
2.  6.6 and 6.6
3.  6.6 and 8.8
4.  8.8. and 6.6

An electronic configuration that has maximum difference between II and III ionization potential is:

1. 1s² 2s² 2p⁶ 3s¹

2. 1s² 2s² 2p⁶ 3s²

3. 1s² 2s² 2p⁶

4. 1s² 2s² 2p⁵

Incorrect order among the following is:

1. NH₃ < PH₃ < AsH₃ – Acidic

2. Li < Be < B < C – I^st Ionization potential

3. Al₂O₃ < MgO < Na₂O < K₂O - Basic

4. Li⁺ < Na⁺ < K⁺ < Cs⁺ - Ionic radius

If an atom has electronic configuration 1s²2s²2p⁶3s²3p⁶3d³4s², we will place it in group number: