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Chemistry Unit 6 Test

Total questions: 40

Worksheet time: 3600secs

Name
Class
Date
1.

The molecule which has strongest bond is:

a)

F-F

b)

B r-B r

c)

Cl-Cl

d)

I-I

2.

Mark the pair of species which have dissimilar geometry:

a)

BF3, AlCI3

b)

HgCl2, BeCl2

c)

HgCl2, BeCl2

d)

NH3, H2O

3.

Which one of the following bonds has greater bond energy?

a)

C - C

b)

C = C

c)

C ≡ C

d)

C ≡ N

4.

Which overlapping may not lead to sigma bond formation?

a)

s-p in hydrogen fluoride

b)

sp2-sp2 in benzene        

c)

p-p in fluorine

d)

p-p in ethane

5.

In which one of the following compounds is the bonding most ionic?

a)

LiCl

b)

NaCl

c)

LiBr

d)

NaBr

6.

The second ionization potential of alkali metals are very high due to:

a)

ns1 electronic configuration

b)

Inert gas configurations

c)

Being s-block elements

d)

Being metals

7.

Which one of the following factors does not increase bond energy:

a)

Greater bond order

b)

Greater electronegative difference

c)

smaller size

d)

Greater bond length

8.

1, 3-Butadiene has number of sigma and pi bonds:

a)

7 sigma bonds and 1 pi bond

b)

9 sigma bonds and 2 pi bonds

c)

8 sigma bonds and 2 pi bonds

d)

6 sigma bonds and 1 pi bond

9.

Which of the following is not limitation of VSEPR theory?

a)

It cannot be applied to ionic compounds

b)

It is not useful for predicting the geometry of transition metal complexes

c)

It fails to predict the extent of distortions in irregular geometries

d)

Both lone pair as well as bond pair participate in determining geometry of the molecule

10.

Which one of the following statements is incorrect about orbital hybridization?

a)

Atomic orbitals taking part in orbital hybridization have smaller energy difference

b)

Unhybridized p-atomic orbitals determine geometry of the molecule

c)

Number of atomic orbitals mixed = number of hybrid orbitals

d)

Hybrid orbitals have electron density concentrated on one side of the nucleus i.e. it has one lobe larger in size than other

11.

The radius of an atom cannot be measured precisely because

a)

Atom has no sharp boundary

b)

Size of atom changes from one compound to other

c)

Finding probability of electrons never becomes zero

d)

All of the above

12.

In ammonium ion the bond angle is equal to

a)

NF3

b)

H2S

c)

CCl4

d)

CO2

13.

Which of the following specie contains only sp–hybridized carbon atom

a)

Hydrogen cyanide

b)

Propyne

c)

Vinyl alcohol

d)

1, 3-Butadiene

14.

Which of the following pair has same geometry but different bond angle

a)

SiO2 and SO2

b)

H2S and CS2

c)

BeCl2 and CO2

d)

H2S and H2O

15.

Which of the following halogen has almost same bond energy

a)

F2 and Cl2

b)

F2 and I2

c)

Cl2 and Br2

d)

Br2 and I2

16.

Which one of the following molecules has minimum value of bond angle?

a)

SiH4

b)

NF3

c)

BH3

d)

CO2

17.

The correct ascending order of electron affinity is

a)

I > F > Cl

b)

 I < F < Cl

c)

I > Cl > F

d)

I < Cl < F

18.

Which one of the following species shows maximum types of van der waal’s repulsions?

a)

H2S

b)

NF3

c)

H3O+

d)

NH4+

19.

All of the following are co-planar molecules except

a)

Propyne

b)

Ethyne

c)

Benzene

d)

Ethene

20.

Which of the following has lowest first ionization energy

a)

Ne

b)

N

c)

O

d)

F

21.

Total number of sigma and pi bonds in vinyl alcohol are

a)

5 sigma and 1 pi

b)

6 sigma and 1 pi

c)

5 sigma and 2 pi

d)

6 sigma and 2 pi

22.

The carbon-carbon sigma bond in ethyne molecule, is formed by overlapping between orbitals of carbon atoms

a)

sp2

b)

sp3

c)

sp

d)

2pz

23.

Which C-atom has sp2 hybridization in given molecule 1CH- = 2CH- 3CH = 4CH2

a)

1, 2

b)

2, 3

c)

3, 4

d)

 1, 2, 3, 4

24.

Hybridization is the extended form of         theory

a)

VSEPR

b)

Molecular orbital

c)

Lewis

d)

Valence bond

25.

Which one of the following processes requires the highest amount of energy

a)
b)
c)
d)
26.

The I.E. of nitrogen is more than that of oxygen due to the

a)

The smallest size of nitrogen

b)

The extra stability of the half-filled p orbitals

c)

More penetrating effect

d)

The greater attraction of electron by the nucleus

27.

The elements of group                      shows abnormal low values of electron affinity in every period of periodic table

a)

IIIA and VIA

b)

IIA, VA and VIIA

c)

IIA and VIIIA

d)

IIA, VA and VIIIA

28.

The incorrect statement among the following is

a)

The first ionization energy of Al is less than the first I.E. of Mg

b)

The second ionization energy of Mg is greater than the second I.E. of Na

c)

The first ionization energy of Na is less than the first I.E. of Mg

d)

The third I.E. of Mg is greater than that of Al

29.

Which factor does not effect I.E. across the period

a)

A) Number of shells

b)

B) Shielding effect

c)

C) Nature of orbitals

d)

Both A. and b

30.

A regular hexagonal crystalline lattice of ice is mostly formed by

a)

Ionic bond

b)

Covalent bond

c)

Metallic bond

d)

Hydrogen bond

31.

Choose the species that is incorrectly matched with the shape of the central atom

a)

CF4 tetrahedral

b)

H2O tetrahedral

c)

BeCl2 linear

d)

NH3 pyramidal

32.

A compound which has all the three types of chemical bonds

a)

CuSO4. 5H2O

b)

NaBH4

c)

NH4Cl

d)

All of these

33.

Which one of the following molecules has the highest dipole moment

a)

H2S

b)

H2O

c)

SO2

d)

CS2

34.

Bonding in phosphonium ion is       percent covalent

a)

25

b)

50

c)

33

d)

75

35.

Formation of MgO is an example of

a)

Ionic bond

b)

Polar covalent bond

c)

Non-polar Covalent bond

d)

Double Covalent bond

36.

The bond between H-H is

a)

Stronger than the bond between C-C

b)

Weaker than the bond between C-C

c)

Neither stronger nor weaker than the bond between C-C

d)

Not comparable

37.

Which hybrid orbitals are used for bonding in triangular pyramidal molecule

a)

sp2

b)

dsp2

c)

sp

d)

sp3

38.

The hybridization state of ‘S’ in SO3 is similar to that of

a)

C in C2H2

b)

C in CO2

c)

C in C2H6

d)

C in C2H4

39.

Which of the following is NOT tetrahedral?

a)

BF-4

b)

SO2-4

c)

NH+4

d)

CO32−CO_3^{2^-}  

40.

Which of following pair contains iso-structural species

a)

CH and CH+-

b)

SO2- and BF-

c)

NH3, BF3

d)

CO2 and SO2

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