PPSC Lecturer Chemistry Test 6 Online Preparation MCQs |

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Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
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Test Instructions:-
Test Name	Lecturer Chemistry
Subject	Chemistry Test 6
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC Lecturer of Chemistry Practice Test 6

1 / 25

The carbon-carbon bond lengths in rank of increasing bond length is :

triple, single, double

single, double, triple

single, triple, double

triple, double, single

2 / 25

The H–C–H bond angle in ethylene is:

180°

90°

60°

120°

3 / 25

Which molecule has a nonzero dipole moment?

CHCl3

CO2

Cl2

CCl4

4 / 25

The order of stability of carbanions isl

tertiary > secondary > primary

tertiary > primary > secondary

primary > secondary > tertiary

secondary > tertiary > primary

5 / 25

Resonance structures of a molecule have:

different number of paired electrons

different arrangement of atoms

(a) and (c)

same number of paired electrons

same arrangement of atoms

6 / 25

Which statement is true?

Resonance hybrids are averages of all resonance forms resembling the less stable forms

Resonance hybrids are inherently unstable.

Resonance hybrids are more stable than any individual resonance form

Resonance hybrids are averages of all resonance forms resembling the more stable forms

7 / 25

Which of the following is a planar molecule?

Acetic acid

Acetone

Formaldehyde

Formic acid

8 / 25

What is bond angle between the hybrid orbitals in methane?

120°

109.5°

115.5°

180°

9 / 25

When the carbon atom is sp2 hybridized in a compound, it is bonded to:

5 other atoms

3 other atoms

4 other atoms

2 other atoms

10 / 25

The carbon-carbon bond length is maximum in:

CH3CH3

HC≡CH

CH2=CH2

11 / 25

Homolytic fission of covalent bond between carbon atoms will produce:

Two molecules

Carbonium ion and carbanion

Free radicals

Two carbonium ions

12 / 25

Which of the following compounds have highest dipole moment?

chloroform

dichloromethane

chloromethane

carbon tetrachloride

13 / 25

Which of the following hydrocarbons has the shortest C–C bond length?

CH3CH3

CH2=CH2

HC≡CH

14 / 25

Which molecule has the greatest dipole moment
(a) CH₃Cl
(b) CH₃Br
(c) CH₃F
(d) CH₃I

15 / 25

Homolytic fission of C–C bond leads to the formation of :

None of these

Carbanions

Free radicals

Carbonium ions

16 / 25

What is the bond length of a carbon-carbon double bond?

1.54 Å

1.20 Å

1.34 Å

1.68 Å

17 / 25

How many atoms are attached to an atom having a sp hybridization?

18 / 25

Which of the following compounds have planar molecules?

ethyl alcohol

formaldehyde

diethyl ether

1,3-butadiene

(b) and (d)

19 / 25

Compound in which carbons use only sp3 hybrid orbitals for bond formation is
(a) CH3CH2CH3
(b) CH3C≡CH
(c) CH3CH=CH2
(d) CH2=CH—CH=CH2

20 / 25

Which of the following is the correct order of bond lengths:

C–C < C=C < C≡C

C≡C > C–C > C=C

C–C > C≡C > C=C

C≡C < C–C > C=C

21 / 25

Which of the following compounds have lowest dipole moment?

chloromethane

carbon tetrachloride

dichloromethane

chloroform

22 / 25

The H–C–C bond angle in ethane is:

118°28′

120°

109.5°

60°

23 / 25

Which alkyl free radical is the most stable?

methyl

secondary

primary

tertiary

24 / 25

The order of stability of carbonium ions is:

secondary > tertiary > primary

primary > secondary > tertiary

primary > tertiary > secondary

tertiary > secondary > primary

25 / 25

Turbulent flow of a fluid occurs when the Reynold number is a above about:

Turbulent flow of a fluid occurs when the Reynold number is a above about

Your score is

The average score is 58%

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