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PPSC Lecturer Chemistry Test 7 Online Preparation MCQs

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Given below on this Website Online Free Taleem is free online MCQ’s test related to PPSC of Lecturer Chemistry. All the individuals who are going to appear in PPSC Lecturer of Chemistry written test can attempt these tests in order to prepare for it in best possible way. Our tests include all the important questions MCQs of Lecturer of PPSC Chemistry, all Past Papers of Lecturer of Chemistry PPSC that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

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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 7
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 7

1 / 25

An increase in which of the following results in a decrease in the rate of the chemical reaction?

energy of activation

concentration

collision frequency

temperature

2 / 25

What does a “curved” arrow represent?

the movement of two electrons

that two structures are resonance structures

that two structures are equivalent

a link between reactants and products

3 / 25

Which of the following is correct?

Curved arrows are always drawn from an electron poor center to an electron rich center

A single headed arrow means two electrons have been moved

Curved arrows are always drawn from an electron rich center to an electron poor center

A doubled headed arrow means one electron has been moved

4 / 25

What orbitals overlap to create the H–C bond in CH3+?
(a) sp³–sp³
(b) sp²–sp³
(c) s–p
(d) s–sp²

5 / 25

Which of the following is a nucleophile?
(a) AlCl₃
(b) H₃O+
(c) BF₃
(d) CN–

6 / 25

What is the name given for a species that contains a positively charged carbon atom?

methyl radical

carbanion

free radical

carbocation

7 / 25

The isomers of a substance must have:

same functional groups

same chemical properties

same molecular weight

same structural formula

8 / 25

Which statement is correct?

Energy is released when a bond forms.

Energy is released when a bond breaks.

A carbanion is positively charged

A sigma bond results from attraction of protons and electrons

9 / 25

The reaction step that has its transition state at the highest point on the reaction coordinate is the called the:

product favored step

activation energy

rate-determining step

transition step

10 / 25

Which of the following is the strongest interaction?

hydrogen bonding

van der Waals

dipole-dipole interactions

a covalent bond

11 / 25

Which of the following is incorrect?

Resonance stabilization is the extra stability a compound gains from having delocalized electrons

The greater the number of relatively stable resonance contributors, the greater is the resonance stabilization

Delocalized electrons destabilize a compound.

(a) and (c)

12 / 25

Two compounds have the same composition and also have the same atoms attached to the same atoms, although with different orientations in space. These compounds are:

Stereoisomers

Identical

Position isomers

Structural isomers

13 / 25

Which of the following statements is correct?

The stronger the acid, the weaker its conjugate base.

e stronger the base, the stronger its conjugate base.

The stronger the acid, the stronger its conjugate base.

The stronger the acid, the weaker its conjugate acid.

14 / 25

Which of the following statements is incorrect?

An electron-rich atom is called an electrophile.

Electrons move toward positively charged locations.

A nucleophile has a a pair of electrons it can share.

An electrophile is electron loving.

15 / 25

Which describes the bond strength or bond dissociation energy?

a & c

energy released when a bond breaks

energy required to break a bond

energy released when a bond is formed

16 / 25

The stronger the acid:

the larger the pKa

the larger the pH

the less stable its conjugate base

the weaker its conjugate base

17 / 25

Which of the following statements is correct regarding nucleophiles?

They have an unpaired electron

They have a lone-pair of electrons

They have an overall positive charge

They have empty orbitals

18 / 25

Which of the following ranges best represents the strength of a hydrogen bond?

60-80 kcals

80-100 kcals

5-10 kcals

100-120 kcals

19 / 25

Which is defined as a species that accepts a proton?

Bronsted-Lowry acid

Lewis acid

Bronsted-Lowry base

Lewis base

20 / 25

Which of the following is a nonpolar molecule?
(a) HCl
(b) CH₃Cl
(c) H₂
(d) NH₃

21 / 25

Which of the following is the strongest acid?
(a) HI
(b) H₂O
(c) CH₄
(d) CH₃OH

22 / 25

Which statement is correct about acid-base chemistry?

the smaller the pKa, the stronger the acid

all of the above

a small pKa correspond to a large Ka

the larger the Ka, the stronger the acid

23 / 25

Which of the following is not normally considered to be a nucleophile?
(a) NH₃
(b) CH₃NH₂
(c) HC≡C:–
(d) CH₃CH₂+

24 / 25

An electrophile acts as a .................................when it reacts with a nucleophile.

Lewis base

Lewis acid

Arrhenius base

Bronsted-Lowry base

25 / 25

What is the predicted shape, bond angle, and hybridization for CH3+?
(a) trigonal planar, 120°, sp2
(b) trigonal planar, 120°, sp3
(c) trigonal planar, 109.5°, sp2
(d) trigonal pyramidal, 120°, sp2

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