Chemistry : Chemical Bonding and Molecular Structure

Peroxide ion ......
(i) has five completely filled antibonding molecular orbitals
(ii) is diamagnetic
(iii) has bond order one
(iv) is isoelectronic with neon
Which one of these is correct?

• (ii) and (iii)

• (i), (ii) and (iv)

• (i), (ii) and (iii)

• (i) and (iv)

When O₂ is converted into O${}_2^{+}$

• both paramagnetic character and bond order increase

• bond order decreases

• paramagnetic character increases

• paramagnetic character decreases and the bond order increases

Increasing order of carbon-carbon bond length for the following is

$\underset{\left(\mathrm{A}\right)}{{\mathrm{C}}_2{\mathrm{H}}_4} \underset{\left(\mathrm{B}\right)}{{\mathrm{C}}_2{\mathrm{H}}_2} \underset{\left(\mathrm{C}\right)}{{\mathrm{C}}_6{\mathrm{H}}_6} \underset{\left(\mathrm{D}\right)}{{\mathrm{C}}_2{\mathrm{H}}_6}$

• C < B < A < D

• B < C < A < D

• D < C < A < B

• B < A < C < D

Hybridised states of carbon in graphite and diamond are respectively

• sp³, sp³

• sp³, sp²

• sp², sp²

• sp² , sp³

Which of the following is not a characteristic of a covalent compound?

• No definite geometry

• Insoluble in polar solvent

• Smal difference in electronegativity between the combining atoms

• Low melting point

A ligand is a

• Bronsted acid

• either a Lewis acid or a Lewis base

• Lewis base

• Lewis acid

The C-H bond and C-C bond in ethane are formed by which of the following types of overlap?

• sp²-s and sp²-sp²

• sp-s and sp-sp

• p-s and p-p

• sp³-s and sp³-sp³

Which one of the following has a magnetic moment of.1.75 BM?

• V³⁺

• Cr³⁺

• Fe³⁺

• Ti³⁺

Which one of the following contains ionic, covalent and coordinate bonds?

• NaCl

• NaCN

• NaNC

• NaOH

Which one of the following is not true regarding electromeric effect?

• It is a temporary effect

• It operates on multiple bonds

• It requires an attacking reagent

• It results in the appearance of partial charges on the carbon atoms