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

(a)

XeF₄

(b)

AlCl₃

(c)

SF₆

(d)

SCl₂

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-

The correct order of O-O bond length in hydrogen peroxide, ozone and oxygen is _______

(a)

H₂O₂ > O₃ >O₂

(b)

O₂ > O₃ > H₂O₂

(c)

O₂ > H₂O₂ > O₃

(d)

O₃ > O₂ > H₂O₂

Bond order of a species is 2.5 and the number of electons in its bonding molecular orbital is formd to be 8 The no. of electons in its antibonding molecular orbital __________

(a)

three

(b)

four

(c)

Zero

(d)

cannot be calculated form the given unformation

Pick out the incorrect statement from the following.

(a)

Sp³ hybrid orbitals are equivalent and are at an angle of 109^o 28' with each other

(b)

dsp² hybrid orbitals are equivalent and bond angle between any two of them is 90^o

(c)

All five sp³d hybrid orbitals are not equivalent out of these five sp³d hybrid orbitals, three are at an angle of 120^o, remainir two are perpendicular to the plane containing the other three

(d)

none of these

Which of the following molecule has no dative bond?

(a)

CO

(b)

\({ SO }_{ 4 }^{ 2- }\)

(c)

\({ CO }_{ 3 }^{ 2- }\)

(d)

None of these

Which among the following molecule obeys octet rule?

(a)

NO

(b)

NO₂

(c)

N₂O₃

(d)

ClO₂

Calculate the formal charge on C-atom in carbonate ion.

(a)

-1

(b)

0

(c)

+1

(d)

+2

Pick out the molecule having double bond.

(a)

O₂

(b)

N₂

(c)

He₂

(d)

H₂

The correct sequence of increasing covalent character is __________

(a)

LiCl < NaCl 2

(b)

NaCl < LiCl < BeCl₂

(c)

BeCl₂

(d)

The formula of the compound is A₂B₃. The number of electrons in the outermost orbits of A and B respectively are ________

(a)

3 and 6

(b)

3 and 2

(c)

2 and 3

(d)

5 and 2

Which compound has planar structure?

(a)

XeF₄

(b)

XeOF₂

(c)

XeO₂F₂

(d)

XeO₄

The correct order of increasing bond angles in the following triatomic species is ____________

(a)

\({ NO }_{ 2 }^{ + }\)< NO₂ <\({ NO }_{ 2 }^{ - }\)

(b)

\({ NO }_{ 2 }^{ - }\)< NO₂ <\({ NO }_{ 2 }^{ + }\)

(c)

\({ NO }_{ 2 }^{ - }\)<\({ NO }_{ 2 }^{ + }\)< NO₂

(d)

\({ NO }_{ 2 }^{ + }\)< \({ NO }_{ 2 }^{ - }\)2

H₂O is polar, whereas BeF₂ is not It is because ___________

(a)

The electronegativity of F is greater than that of O.

(b)

H₂O involves hydrogen bonding whereas BeF₂ is a discrete molecule

(c)

H₂O is linear and BeF₂ is angular

(d)

H₂O is angular and BeF₂ is linear

Which of the following statements are correct with respect to bond order?
(i) Bond order of N₂ is 3.5
(ii) Bondorder of O₂ is 2
(iii) Bond order of NO⁺ is 3.0
(iv) Bond order of NO is 2.5

(a)

Only (i)

(b)

(i), (ii), (iv)

(c)

(ii), (iii), (iv)

(d)

(i), (ii), (iii), (iv).

Statement I: N₂, CO and CN^- are having same bond order.
Statement II : Isoelectronic species always have same bond order.

(a)

Both statement I and II are true and statement II explains statement I.

(b)

Both statement I and II are true but statement I does not explain statement II.

(c)

Statement I is true, but statement II is false

(d)

Both-statement I and II are false

Identify the incorrect statement with respect to hybridisation.

(a)

Hybridisation is intermixing of orbitals of nearly equal energies.

(b)

Shape of molecule depends upon type of hybridisation only.

(c)

Hybrid orbitals are identical in all aspects.

(d)

Hybrid orbitals can form \(\sigma\) and \(\pi\) bond

The hybrididsation of S in SO₂ is __________

(a)

sp

(b)

Sp²

(c)

sp³

(d)

None of these