40+ Most Important Chemistry MCQs for All Competitive Exams

Chemistry plays a crucial role in any competitive exam, whether you are preparing for government or academic exams. In this article we have compiled 40+ chemistry mcqs.

These mcqs are essential for aspirants worldwide, including CSS, PPSC, FPSC, NEET, MDCAT, SAT and MCAT. We have carefully compiled these mcqs to ensure your success.

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Chemistry

1) How many groups are there in periodic table?

None of these

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Chemistry

2) Chemical formula of salt:

HCL

NaCL

CLO3

None of these

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Chemistry

3) Modern classification of element is based on:

Dobereiner's law of triads

Law of constant proportion

Both

None of these

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Chemistry

4) One Carbon is ________ times heavier than Hydrogen:

None of these

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Chemistry

5) Which of the following is most readily nitrated?

Phenol

Benzaldehyde

Nitrobenzene

Benzoic Acid

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Chemistry

6) Ketones can be prepared by reaction of Grignard reagent with:

Acid Amides

Acid Chloride

Carboxylic Acid

Epoxides

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Chemistry

7)Polysaccharides yield many monosaccharide's on:

Hydration

Oxidation

Reduction

Hydrolysis

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Chemistry

8) Which of the following is not aromatic?

Benzene

Cyclooctatetraene

Pyridine

Phenol

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Chemistry

9) Which of the following is most basic?

H20

NH2

CH3 NH2

CH3OH

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Chemistry

10) Which of the following has lowest pH?

CH3COOH

CF3COOH

CICH2COOH

СІЗС СООН

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Chemistry

11) ......... of the following gives a tertiary alcohol when it treated with Grignard reagent:

HCHO

CH3CHO

C3H5CHO

CH3COCH3

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Chemistry

12) ......... of the following tests is not used to identify aldehyde?

Tollen's test

Benedict solution test

Fehling solution test

Ammonia Test

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Chemistry

13) Which is incorrect about alkaloids?

Naturally Occurring

Possess a heterocyclic ring

Exhibit biological action

Acidic in nature

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Chemistry

14) Which of the followings will not give iodoform test:

Acetone

Ethyl alcohol

Benzaldehyde

Ammonia Test

Acetaldehyde

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Chemistry

12) Which of the following tests is not used to identify aldehyde?

Tollen's test

Benedict solution test

Fehling solution test

Ammonia Test

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Chemistry

15) The reaction of aniline with bromine water gives:

o- Bromoaniline

p- Bromoaniline

2,4-dibromoaniline

2,4,6-tribromoaniline

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Chemistry

16) The reaction of Tripalmitin, with sodium hydroxide is called:

Hydrolysis

Saponification

Esterification

Combustion

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Chemistry

17) Which one is not petrochemical?

Naphthalene

Mineral Oil

Wax

Table salt

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Chemistry

18) Chemical adsorption:

is exothermic

Is irreversible

Takes place at high temp

None of these

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Chemistry

19) The most commonly used absorbent for chromatographic separation of organic compound is:

Activated charcoal

Fuller's Earth

Alumina

Silica gel

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Chemistry

20) Grignard reagent is:

Oregano Zinc halide

Oregano cadmium bromide

n-Butyl Lithium

Oregano Magnesium halide

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Chemistry

21) How many laws of newton about motion?

None of these

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Chemistry

22) Select the type of reaction that occurs when a metal undergoes corrosion?

Reduction reaction

Electromagnetic reaction

Oxidation reaction

None of these

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Chemistry

23) Bohr theory can also be applied to ion like:

Li^+

Be^+3

Li^-

None of these

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Chemistry

24) Stronger the bond.......the bond energy:

Weaker

Greater

Constant

None of these

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Chemistry

25) Which one of following gas is called laughing gas?

Ch4

N20

None of these

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Chemistry

26) Prop-2-ene & Prop-3-ene show which type of isomerism:

Positional isomerism

Geometrical isomerism

Chain isomerism

None of these

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Chemistry

27) Which sequence of main shells is correct in term of decreasing or increasing energy?

N < k> l > m

N >m > l >k

K < l < m < n

Only b & c

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Chemistry

28) Formula of water is:

H20

H202

None of these

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Chemistry

29) The value of Plank's Constant is:

6.63×10^-24js

6.63x10^-34js

6.63×10^-24js

None of these

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Chemistry

30) The H_____ bond is strongest in:

S-H ......O

O-H ......S

F-H ......O

F-H ......S

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Chemistry

31) Heavy water (D20) in a nuclear reactor serves as a --------?

Coolant

Moderator

Both a & b

Neutron absorber

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Chemistry

32) pH + pOH of a solution is:

Zero

-14

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Chemistry

33) The compound that is not Lewis acid:

BF3

BaCl2

SnCl4

AICI3

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Chemistry

34) Strongest acid having Ka:

104

10-4

10-2

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Chemistry

35) Ore of Aluminum:

Calamine

Dolomite

Bauxite

Limestone

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Chemistry

36) Oxidation number of S in sulphuric acid:

Four

Two

Six

Eight

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Chemistry

37) d-block elements form coordination compounds because of:

Small Cationic size

Large ionic Charge

Unfilled d-orbital's

Filled d-orbital's

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Chemistry

38) Brass is an alloy of:

Cu and Zn

Cu, Ni, Zn

Cu and Ni

Cu, Al, Zn

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Chemistry

39) Urea is a high quality nitrogenous fertilizer with:

76% nitrogen

46% nitrogen

66% nitrogen

26% nitrogen

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Chemistry

40) Rust is:

FeO + Fe(OH)2

Fe203 + Fe(OH)2

Fe203

Fe203 + Fe(OH)3

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Chemistry

41) Calcium Carbide reacts with water to give:

Methane

Ethylene

Acetylene

Ethane

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