PERIODIC TABLE JEE

The radius of La³⁺ (atomic no. of La=57) is 1.06A. Which one of the following given values will be closest to the radius of Lu³⁺ (atomic no. of Lu=71)?

• 40A

• 1.06A

• 0.85A

• 1.60A

The increasing order of the ionic radii of the given isoelectronic species is?

• K⁺, S^2-, Ca²⁺, Cl^-

• Cl^-, Ca²⁺, K⁺, S^2-

• S^2-, Cl^-, Ca²⁺, K⁺

• Ca²⁺, K⁺, Cl^-, S^2-

The first ionisation potential of Na is 5.1eV. The value of electron gain enthalpy of Na⁺ will be?

• -2.55eV

• -5.1eV

• -10.2eV

• +2.55eV

According to the Periodic Law of elements, the variation in properties of elements is related to their:

• nuclear masses

• atomic numbers

• nuclear neutron-proton number ratios

• atomic masses

Which one of the following is an amphoteric oxide?

• Na₂O

• SO₂

• B₂O₃

• ZnO

The order of increasing sizes of atomic radii among the elements O, S, Se and As is:

• As < S < O < Se

• O < S < As < Se

• Se < S < As < O

• O < S < Se < As

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in:

• exhibiting maximum covalency in compound.

• exhibiting amphoteric nature in their oxides.

• forming covalent halides.

• forming polymeric hydrides.

Which is the correct order of second ionization potential of C, N, O and F in the following?

• O > F > N > C

• O > N > F > C

• C > N > O > F

• F > O > N > C

The group having isoelectronic species is:

• O^2- ,F^- ,Na⁺ ,Mg²⁺

• O^2- ,F^- ,Na ,Mg⁺

• O^2- ,F^- ,Na ,Mg²⁺

• O^- ,F^- ,Na⁺ ,Mg²⁺

Which of the following oxides is amphoteric in character?

• CaO

• CO₂

• SiO₂

• SnO₂