The ions N^3-, O^2-, F^-, Na⁺, Mg²⁺ are isoelectronic. Their ionic radii show

• an increase from N^3- to F^- and then decrease from N⁺ to Mg²⁺

• a decrease from N^3- to F^- and then increase from Na⁺ to Mg²⁺

• a significant increase from N^3- to Mg²⁺

• a significant decrease from N^3- to Mg²⁺

Which of the following pairs of ions cannot be separated by H₂S in dilute HCl?

• Bi³⁺, Sn⁴⁺

• Al³⁺, Hg²⁺

• Cu²⁺, Zn²⁺

• Ni²⁺, Cu²⁺

The radius of H-atom in its ground state is 0.58Å .The radius of, ₃Li²⁺ ithe similar state is

• 0.1777 Å

• 0.706 Å

• 1.06 Å

• 0.058 Å

The correct order of ionization energies is

• Cu > Ag > Au

• Cu > Au > Ag

• Au > Cu > Ag

• Ag > Au > Cu

The set representing the correct order of ionic radius is

• Li⁺ > Be²⁺ > Na⁺ > Mg²⁺

• Na⁺ > Li⁺ > Mg²⁺ > Be²⁺

• Li⁺ > Na⁺ > Mg²⁺ > Be²⁺

• Mg²⁺ > Be²⁺ > Li⁺ > Na⁺

376.

Which of the following is the correct decreasing order of oxidation state of nitrogen?

• HNO₃ > NO > NH₄Cl > N₂

• HNO₃ > NO > N₂ > NH₄Cl

• HNO₃ > NH₄Cl > NO > N₂

• NO > HNO₃ > NH₄Cl > N₂

Which of the following has highest electron affinity?

• N

• O

• F

• Cl

The one electron species having ionisation energy of 54.4 eV is

• He⁺

• H

• Be²⁺

• Be³⁺

Ionisation energy in group 1A varies in the decreasing order as

• Li > Na > K > Cs

• Na > Li > K > Cs

• Li > Cs > K  Na

• K > Cs > Na > Li

An example of a non-stoichiometric compound is

• PbO

• NiO₂

• Al₂O₃

• Fe₃O₄