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

The correct order of $I^{st}$ IP(ionization potential) among the following elements Be, B, C, N, O is:

Incorrect order among the following is:

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

The ions O^2–, F^–, Na⁺, Mg²⁺, and Al³⁺ are isoelectronic. Their ionic radii show: 

Ionic radii are:

Which one of the following oxides is expected to exhibit paramagnetic behaviour:

1. CO₂

2. ClO₂

3. SO₂

4. SiO₂

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

1.  F < Cl < O < S

2.  S < O < Cl < F

3.  O < S < F < Cl

4.  Cl < F < S < O