Which of the following species contains an equal number of σ and Π bond? 

• HCO₃^-

• XeO₄

• (CN)₂

• (CN)₂

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

• Ar < K⁺< Ca²⁺

• Ca²⁺ < Ar < K⁺

• Ca²⁺ < K⁺ < Ar

• Ca²⁺ < K⁺ < Ar

Solubility of the alkaline earth's metal sulphates in water decreases in the sequence

• Mg>Ca>Sr>Ba

• Ca>Sr>Ba>Mg>

• Sr>Ca>Mg>Ba

• Sr>Ca>Mg>Ba

Which of the following pairs of ions are isoelectronic and isostructural? 

Magnetic moment 2.84 BM is given by (At. no. Ni= 28, Ti= 22, Cr=24, Co = 27)

• Ni²⁺

• Ti³⁺

• Cr³⁺

• Cr³⁺

If the value of an equilibrium constant ofr particular reaction is 1.6 x10¹² then at equilibrium the system will contains

• all reactants

• mostly reactants

• mostly products

• mostly products

The number of d- electrons in Fe²⁺ (Z = 26) is not equal to the number of electrons in which one of the following?

• S- electronic in Mg (Z=12)

• p-electrons in Cl( Z=17)

• d- electrons in Fe (Z=26)

• d- electrons in Fe (Z=26)

The angular momentum of electrons in d orbital is equal to

9.

The K_sp of Ag₂CrO₄, AgCl, AgBr and AgI are respectively, 1.1 x 10^-12, 1.8 x 10^-11, 8.3 x 10^-17. Which one of the following salts will precipitate last if AgNO₃ solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na₂CrO₄? 

• AgI

• AgCl

• AgBr

• AgBr

Which of the following statements is correct for a reversible process in a state of equilibrium?

• ΔG = -2.303RT log K

• ΔG = 2.303RT log K

• ΔG⁰ = -2.303RT log K

• ΔG⁰ = -2.303RT log K