#### 11th Standard Chemistry Chemical bonding English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. Which one of the following is the likely bond angles of sulphur tetrafluoride molecule?

(a)

120o,80o

(b)

109o,28

(c)

90o

(d)

89o,117o

2. According to Valence bond theory, a bond between two atoms is formed when

(a)

fully filled atomic orbitals overlap

(b)

half filled atomic orbitals overlap

(c)

non- bonding atomic orbitals overlap

(d)

empty atomic orbitals overlap

3. Hybridisation of central atom in PClinvolves the mixing of orbitals

(a)

s, px, py, dx2 , dx2-y2

(b)

s, px . py, pxy . dx2-y2

(c)

s, px, py, pz, dx2-y2

(d)

s, px, py, dxy, dx2-y2

4. Which one of the following is diamagnetic?

(a)

O2

(b)

$O_2^{2-}$

(c)

$O_2^+$

(d)

None of these

5. Shape and hybridisation of IF5 are

(a)

Trigonal bipyramidal, Sp3d2

(b)

Trigonal bipyramidal, Sp3d

(c)

Square pyramidal, Sp3d2

(d)

Octahedral, Sp3d2

6. Xe F2 is isostructural with

(a)

SbCl2

(b)

BaCl2

(c)

TeF2

(d)

ICI2-

7. Non- Zero dipole moment is shown by

(a)

CO2

(b)

p-dichlorobenzene

(c)

carbontetrachloride

(d)

water

8. Identify the molecule which has more than 8 electrons in outermost orbit-

(a)

SO3

(b)

SO2

(c)

P2O5

(d)

All of these

9. The total number of lone pair present in XeF4 is

(a)

10

(b)

12

(c)

14

(d)

16

10. Find out the most favourable condition for electrovalent bonding.

(a)

Low ionization potential of one atom and high electron affinity of the other atom.

(b)

High electron affinity and high ionisation potential of both the atoms.

(c)

Low electron affinity and low ionisation potential of both the atoms.

(d)

High ionisation potential of one atom and low electron affinity of the other atom.

11. Which of the following is not true about covalent compounds?

(a)

They undergo molecular reactions

(b)

They possess low melting and boiling points

(c)

They undergo ionic reactions

(d)

They exhibit isomerism

12. The sharing of valence electrons between the atoms will lead to the formation of_____

(a)

Ionic bond

(b)

Covalent bond

(c)

Co-ordinate bond

(d)

Hydrogen bond

13. The geometry of electron pairs around S in SF6 is

(a)

Octahedral

(b)

Trigonal bipyramidal

(c)

Square pyramidal

(d)

Linear

14. Which molecule among the following has both polar and non-polar covalent bond?

(a)

${ NH }_{ 4 }^{ + }$

(b)

H2O2

(c)

HCI

(d)

CH4

15. Which of the following is a polar molecule?

(a)

BF3

(b)

SiF4

(c)

SF4

(d)

XeF4

16. In the formation of ethylene molecule, the carbon atom makes use of___________ hybridisation.

(a)

sp

(b)

Sp2

(c)

sp3

(d)

dsp2

17. Statement I : Bond angle of BF3 and NF3 are different
Statement II : Both the molecules are having different shapes.

(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

18. CO2 is isostructural with

(a)

C2H2

(b)

SnCl2

(c)

N02

(d)

SO2

19. The atomic orbitals involved in hybridisation of SF6 molecule is

(a)

3s, 3px' 3py, 3pz,3dz

(b)

4s, 4px, 4py, 4pz,3dx2-y2,3dxy

(c)

3s, 3px, 3py, 3pz,3${ d }_{ z }^{ 2 }$,dx2-y2

(d)

3s, 3px,3py, 3dxy,3dyz, 3dxy

20. Which among the following cannot be formed?

(a)

H2

(b)

He2

(c)

N2

(d)

O2