The sp³d² hybridisation of central atom of a molecule would lead to

• square planar geometry

• tetrahedral geometry

• trigonal bipyramidal geometry

• octahedral geometry

Hybridisation of C₂ and C₃ of H₃C-CH=C-CH₃ are

• sp, sp³

• sp², sp

• sp², sp²

• sp, sp

Nitrogen forms stable N₂ molecule, but phosphorus is converted to P₄ from P₂ because

• $\mathrm{p\pi }-\mathrm{p\pi }$ bonding is strong in phosphorus 

• $\mathrm{p\pi }-\mathrm{p\pi }$  bonding is weak in phosphorus 

• double bond is present in phosphorus

• single P-P bond is weaker than N-N bond

Which of the following ion is diamagnetic?

• Nd³⁺

• La³⁺

• Tb³⁺

• Er³⁺

An aqueous solution of titanium chloride, when subjected to magnetic measurement, show zero magnetic moment. The formula of complex in aqueous solution is

• [Ti(H₂O)₆]Cl₄

• [Ti(H₂O)₆]Cl₃

• [Ti(H₂O)₅Cl]Cl₂

• [Ti(H₂O)₆]Cl

Among [Fe(H₂O)₆]⁺, [Fe(CN)₆]^3-, [Fe(Cl)₆]^3- species, the hybridisation state of the Fe atom are, respectively.

• d²sp³, d²sp³, sp³d²

• sp³d²,d²sp³, d²sp³

• sp³d², d²sp³,sp³d²

• None of the above

Which of the following ligands is tetradentate?

Some of the properties of the two species, ${\mathrm{NO}}_3^{-} \mathrm{and} {\mathrm{H}}_3{\mathrm{O}}^{+}$ are described below. Which one of them is correct?

• Dissimilar in hybridisation for the central atom with different structures

• Isostructural with same hybridisation for the central atom

• Isostructural with different hybridisation for the central atom

• Similar in hybridisation for the central atom with different structures

69.

Which of the following structures is the most preferred and hence of lowest energy for SO₃?

• 

• 

• 

• 

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

• ${\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-}$ - Both diamagnetic 

• ${\mathrm{O}}^{+}, {\mathrm{O}}_2^{2-}$ - Both diamagnetic 

• ${\mathrm{O}}_2^{+}, {\mathrm{O}}_2$ - Both diamagnetic 

• $\mathrm{O}, {\mathrm{O}}_2^{2-}$ - Both diamagnetic