PPSC Lecturer Chemistry Test 7 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 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

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

transition step

rate-determining step

activation energy

product favored step

2 / 25

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

3 / 25

The stronger the acid:

the less stable its conjugate base

the larger the pH

the weaker its conjugate base

the larger the pKa

4 / 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

5 / 25

Which statement is correct about acid-base chemistry?

the larger the Ka, the stronger the acid

all of the above

a small pKa correspond to a large Ka

the smaller the pKa, the stronger the acid

6 / 25

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

carbanion

carbocation

free radical

methyl radical

7 / 25

Which is defined as a species that accepts a proton?

Lewis acid

Bronsted-Lowry base

Lewis base

Bronsted-Lowry acid

8 / 25

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

concentration

temperature

energy of activation

collision frequency

9 / 25

Which of the following is incorrect?

Delocalized electrons destabilize a compound.

(a) and (c)

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

10 / 25

Which of the following statements is correct regarding nucleophiles?

They have an unpaired electron

They have an overall positive charge

They have empty orbitals

They have a lone-pair of electrons

11 / 25

Which of the following statements is incorrect?

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

An electron-rich atom is called an electrophile.

Electrons move toward positively charged locations.

An electrophile is electron loving.

12 / 25

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

13 / 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:

Structural isomers

Stereoisomers

Identical

Position isomers

14 / 25

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

100-120 kcals

80-100 kcals

60-80 kcals

5-10 kcals

15 / 25

Which of the following is correct?

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

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

16 / 25

Which describes the bond strength or bond dissociation energy?

energy released when a bond is formed

energy required to break a bond

energy released when a bond breaks

a & c

17 / 25

What does a “curved” arrow represent?

a link between reactants and products

that two structures are equivalent

the movement of two electrons

that two structures are resonance structures

18 / 25

Which of the following statements is correct?

The stronger the acid, the stronger its conjugate base.

e stronger the base, the stronger its conjugate base.

The stronger the acid, the weaker its conjugate base.

The stronger the acid, the weaker its conjugate acid.

19 / 25

Which of the following is the strongest interaction?

hydrogen bonding

van der Waals

a covalent bond

dipole-dipole interactions

20 / 25

Which statement is correct?

Energy is released when a bond forms.

A carbanion is positively charged

A sigma bond results from attraction of protons and electrons

Energy is released when a bond breaks.

21 / 25

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

22 / 25

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

23 / 25

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

24 / 25

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

Arrhenius base

Lewis acid

Bronsted-Lowry base

Lewis base

25 / 25

The isomers of a substance must have:

same functional groups

same molecular weight

same structural formula

same chemical properties

Your score is

The average score is 58%

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