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

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

67.

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 

Which of the following is correct comparison of the stability of the molecules?

• $\mathrm{CN} < {\mathrm{O}}_2^{+}$

• CN = N₂

• N₂ < O₂

• ${\mathrm{H}}_2^{+} > {\mathrm{He}}_2^{+}$

Dipole moment of HCl = 1.03 D, HI = 0.38 D. Bond length of HCl = 1.3 $\stackrel{°}{\mathrm{A}}$ and HI= 1.6 $\stackrel{°}{\mathrm{{\rm A}}}$.  The ratio of fraction of electric charge, $\mathrm{\delta }$, existing on each atom in HCl and HI is

• 12: 1

• 2.7: 1

• 3.3: 1

• 1: 3.3