PPSC Lecturer Chemistry Test 37 Online Preparation MCQs

1 Comment / By Hassan / May 23, 2021

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.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
Practice this test at least 5 times if you want to secure High Marks.
At the End of the Test you can see your Test score and Rating.
If you found any incorrect answer in Quiz. Simply click on the quiz title and comment below on that MCQ. So that I can update the incorrect answer on time.

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Test Instructions:-
Test Name	Lecturer Chemistry
Subject	Chemistry Test 37
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 TEST NO. 37

1 / 25

An aqueous solution of glucose behaves as an aldehyde because:

it is a ketone, but is in equilibrium with the aldehyde form

glucose is actually a cyclic aldehyde

it is hydrolyzed by water to the free aldehyde

its cyclic hemiacetal, the predominant form, is in equilibrium with the free aldehyde form

2 / 25

How many stereoisomers are possible for a 2-ketohexose?

3 / 25

Which of the following statements best describes the meaning of “mutarotation”?

a rapid exchange between the D and L forms

a slow exchange between hydrogen and deuterated hydrogen

a slow change in optical rotation to reach an equilibrium value

a rapid exchange between the α and β forms of diastereomeric sugars

4 / 25

How many chirality centers are there in a 2-ketohexose?

5 / 25

The most stable conformation of cyclohexane is the :

Chair form

Haworth form

Boat form

6 / 25

The bond angle between carbon atoms in cyclohexane is

60°

120°

90°

109.5°

7 / 25

Which of the following is true about sucrose?

It is a monosaccharide.

It hydrolyzes to fructose and glucose.

It is a reducing sugar.

It undergoes mutarotation in water.

8 / 25

Which of the following statements best describes the meaning of a “glycoside”?

It is the enantiomer of a sugar.

It is the acetal of a sugar.

It is the hemiacetal of a sugar.

It is the mirror image of a sugar.

9 / 25

Monosaccharides are classified according to :

the number of carbon atoms in the molecule.

whether they contain an aldehyde or a ketone group.

all of the above.

their configurational relationship to glyceraldehyde.

10 / 25

What percentage of cyclohexane molecule is estimated to be in the boat form at any given time?

less than 1%

over 99%

approximately 50%

between 90% and 99%

11 / 25

Uriedes are

Alkyl derivatives of urea

None of these

Acetyl derivatives of urea

Halogen derivatives of urea

12 / 25

Which term describes a sugar where one of the OH groups has been replaced with a hydrogen?

deoxy sugar

imino sugar

dehydroxy sugar

amino sugar

13 / 25

All chiral D-sugars rotate plane-polarized light :

in a direction that cannot be predicted but must be determined experimentally

clockwise

counterclockwise

+20.0°

14 / 25

The designation D or L before the name of a monosaccharide

indicates the length of the carbon chain in the carbohydrate.

indicates the position of the OH group on the carbon next to the primary alcohol group.

indicates the position of the asymmetric carbon atoms in the carbohydrate.

indicates the direction of rotation of polarized light.

15 / 25

In solution, glucose exists as:

the cyclic hemiacetal form only

the cyclic acetal form only

the open-chain form only

an equilibrium mixture of the open-chain form and cyclic hemiacetal forms

16 / 25

A carbohydrate composed of three to ten sugar molecules is called a(n) :

polysaccharide

disaccharide

oligosaccharide

monosaccharide

17 / 25

Anomers of D-glucopyranose differ in their stereochemistry at

18 / 25

Which is a disaccharide?

Maltose

Glucose

Cellulose

Fructose

19 / 25

The principal sugar in blood is

Fructose

Glucose

Galactose

Sucrose

20 / 25

Which of the following statements best describes the difference between amylose and amylopectin?

Amylose is composed of thousands of D-glucose units while amylopectin is composed of thousands of D-galactose units.

Amylose contains α-1,6-glycosidic linkage which amylopectin does not contain.

Amylose is a branched polysaccharide while amylopectin is a chain polysaccharide.

Amylose is a straight-chain polysaccharide while amylopectin is a branched polysaccharide.

21 / 25

Diethyl malonate reacts with urea in the presence of sodium ethoxide to form

Phenobarbital

Barbital

Uric acid

Barbituric acid

22 / 25

Which of the following is not a monosaccharide?

Fructose

Ribose

Glucose

Sucrose

23 / 25

Which of the following would give a positive Tollen’s test?

methyl β-D-glucopyranoside

methyl α-D-ribofuranoside

α-D-glucopyranose

sucrose

24 / 25

Uric acid on oxidation with alkaline KMnO4 forms :

Barbituric acid

Caffeine

Urea

Allantoin

25 / 25

Which is a monosaccharide?

Sucrose

Galactose

Maltose

Cellulose

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1 thought on “PPSC Lecturer Chemistry Test 37 Online Preparation MCQs”

Abaid ullah
May 23, 2021 at 3:47 pm

Excellent

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