In which of the following Compounds does the central atom obey the octet rule ?

(a)

XeF₄

(b)

AlCl₃

(c)

SF₆

(d)

SCl₂

In the molecule O_A = C = O_B, the formal charge on O_A, C and O_B are respectively.

(a)

-1, 0, +1

(b)

+1, 0, -1

(c)

-2, 0, +2

(d)

0, 0, 0

The ratio of number of sigma (σ) and pi (л) bonds in 2- butynal is __________

(a)

8/3

(b)

5/3

(c)

8/2

(d)

9/2

Assertion: Oxygen molecule is paramagnetic.
Reason: It has two unpaired electron in its bonding molecular orbital.
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) Both assertion and reason are false

(a)

both assertion and reason are true and reason is the correct explanation of assertion

(b)

both assertion and reason are true but reason is not the correct explanation of assertion

(c)

assertion is true but reason is false

(d)

Both assertion and reason are false

In ClF₃, NF₃ and BF₃ molecules the chlorine, nitrogen and boron atoms are ______

(a)

sp³ hybridised

(b)

sp³ ,sp³ and sp² respectively

(c)

sp² hybridised

(d)

sp³d, sp³ and sp hybridised respectively

Which of these represents the correct order of their increasing bond order _________

(a)

C₂ < C₂ ^2- < O₂ ^2- < O₂

(b)

C ₂ ^2- < C₂ ⁺  < O₂ < O₂ ^2-

(c)

O₂ ^2- < O₂ < C₂ ^2-  < C ²⁺

(d)

O₂ ^2- < C₂ ⁺ < O₂ < C₂ ^2-

Hybridisation of central atom in PCl₅ involves the mixing of orbitals __________

(a)

s, p_x, p_y, d_x2 , d_x²-y²

(b)

s, p_x . p_y, p_xy . d_x²-y²

(c)

s, p_x, p_y, p_z, d_x²-y²

(d)

s, p_x, p_y, d_xy, d_x²-y²

Shape and hybridisation of IF₅ are ________

(a)

Trigonal bipyramidal, Sp³d²

(b)

Trigonal bipyramidal, Sp³d

(c)

Square pyramidal, Sp³d²

(d)

Octahedral, Sp³d²

In which of the following molecules /ions BF₃, NO₂^-, H₂O the central atom is sp² hybridised?

(a)

NH₂^- and H₂O

(b)

NO₂^- and H₂O

(c)

BF₃ and NO₂^-

(d)

BF₃ and NH₂^-

Draw the M.O diagram for oxygen molecule calculate its bond order and show that O₂ is paramagnetic.

Draw MO diagram of CO and calculate its bond order.

Discuss the formation of N₂ molecule using MO Theory

Hydrogen gas is diatomic where as inert gases are monoatomic – explain on the basis of MO theory.

What is Polar Covalent bond ? explain with example.

Explain VSEPR theory. Applying this theory to predict the shapes of IF₇, and SF₆.

CO₂ and H₂O both are triatomic molecule but their dipole moment values are different. Why ?

Describe fajan's rule.