d²sp³ hybridisation of the atomic orbitals gives

• square planar structure

• triangular structure

• tetrahedral structure

• octahedral structure

A group of atoms can function as a ligand only when

• It is a small molecule

• It has an unshared electron pair

• Its a negatively charged ion

• It is a positively charge ion

Which of the following is diamagnetic?

• H${}_2^{+}$

• He${}_2^{+}$

• O₂

• N₂

The number of anti-boinding electron present in O${}_2^{+}$ molecular ion is

• 8

• 6

• 5

• 4

The pair of compounds having identical shapes for their molecules is

• CH₄, SF₄

• BCl₃, ClF₃

• XeF₂, ZnCl₂

• SO₂, CO₂

The correct arrangement for the ions in the increasing order of their radii is

• Na⁺, Cl^-, Ca²⁺

• Ca²⁺, K⁺, S^2-

• Na⁺, Al³⁺, Be²⁺

• Cl^-, F^-, S^2-

The correct arrangement of the species in the decreasing order of the bond length between carbon and oxygen in them is

• CO, CO₂, HCO${}_2^{-}$, CO${}_3^{2-}$

• CO₂,CO, CO${}_3^{2-}$, HCHO${}_2^{-}$

• CO${}_3^{2-}$, HCO${}_2^{-}$, CO₂, CO

• CO, CO${}_3^{2-}$, CO₂, HCO${}_2^{-}$

A correct statement is

• [Co(NH₃)₆]²⁺ is paramagnetic

• [MnBr₄]^2- is tetrahedral

• [CoBr₂(en)₂]^- exhibits linkage isomerism

• [Ni(NH₃)₆]²⁺ is an inner orbital complex

559.

Which one of the following conversion results in the change of hybridisation and geometry?

• CH₄ to C₂H₂

• NH₃ to N⁺H₄

• BF₃ to BF${}_4^{-}$

• H₂O to H₃O⁺

If the bond energies of H-H, Br-Br and H-Br are 433, 192 and 364 kJ mol^-1 respectively, then $∆$H° for the reaction-

H₂ (g) + Br₂ (g) → 2HBr (g) is

• -261 kJ

• +103 kJ

• +261 kJ

• -103 kJ