Classification of Elements and Periodicity in Properties

Which of the following oxide is amphoteric?

1. SnO2
2. CaO
3. SiO2
4. CO2

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

1. Mg < Ca < Cl < P
2. Cl < P < Mg < Ca
3. P < Cl < Ca < Mg
4. Ca < Mg < P < Cl

Among the following which one has the highest cation to anion size ratio?

1. CsI
2. CsF
3. LiF
4. NaF

The correct order of the decreasing ionic radii among the following isoelectronic species is

1. Ca2+ > K+ > S2- > Cl-
2. Cl- > S2- > Ca2+ > K+
3. S2- > Cl- > K+ > Ca2+
4. K+ > Ca2+ > Cl- > S2-

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?

1. Cl < F < O < S
2. O < S < F < Cl
3. F < S < O < Cl
4. S < O < Cl < F

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?

1. [Ne] 3s2 3p2
2. [Ar] 3d10 4s2 4p3
3. [Ne] 3s2 3p1
4. [Ne] 3s2 3p3

Identify the correct order of the size of the following:

1. Ca2+ < K+ < Ar < Cl- < S2-
2. Ar < Ca2+ < K+ < Cl- < S2-
3. Ca2+ < Ar < K+ < Cl- < S2-
4. Ca2+ < K+ < Ar < S2- < Cl-

With which of the following electronic configuration an atom has the lowest ionisation enthalpy?

1. 1s2 2s2 2p3
2. 1s2 2s2 2p6 3s1
3. 1s2 2s2 2p6
4. 1s2 2s2 2p5

Which of the following is the most basic oxide?

1. SeO2
2. Al2O3
3. Sb2O3
4. Bi2O3

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

1. S < O < Cl < F
2. Cl < F < S < O
3. F < Cl < O < S
4. O < S < F < Cl