General Science Jkssb Chemistry Set 1 Mcqs (504 MCQs) | JKSSB & SSC Quiz

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jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 381 Discuss
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The conversion of 'Hard Water' into 'Soft Water' by using Zeolite involves:

A
adsorption
B
ion exchange
C
sedimentation
D
distillation

Answer & Explanation

Correct Option: B

Zeolites exchange their Sodium ions for the Calcium and Magnesium ions present in hard water.
Question 382 Discuss
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Which among the following is a 'Polyamide'?

A
terylene
B
nylon 6,6
C
teflon
D
polythene

Answer & Explanation

Correct Option: B

Nylon 6,6 is formed by the condensation of adipic acid and hexamethylenediamine, containing amide linkages.
Question 383 Discuss
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Which of the following is not a 'Nucleophile'?

A
h2o
B
nh3
C
alcl3
D
oh-

Answer & Explanation

Correct Option: C

AlCl3 is an electron-deficient Lewis acid (electrophile), while the others have lone pairs or negative charges.
Question 384 Discuss
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What is the main chemical constituent of 'Safety Matches' striking surface?

A
white phosphorus + glass powder
B
red phosphorus + glass powder
C
phosphorus trisulphide
D
potassium chlorate

Answer & Explanation

Correct Option: B

The box side contains red phosphorus and glass powder, while the match head contains potassium chlorate.
Question 385 Discuss
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Which of the following is an 'Amphoteric' oxide?

A
na2o
B
zno
C
so2
D
cao

Answer & Explanation

Correct Option: B

Amphoteric oxides like ZnO and Al2O3 react with both acids and bases to form salts.
Question 386 Discuss
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The 'Brown Ring Test' is used for the qualitative analysis of which radical?

A
nitrate
B
carbonate
C
sulphate
D
chloride

Answer & Explanation

Correct Option: A

The brown ring is formed due to the complex $[Fe(H_2O)_5NO]^{2+}$ at the junction of two liquids.
Question 387 Discuss
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Which radioactive isotope is used in 'smoke detectors'?

A
uranium-238
B
americium-241
C
cobalt-60
D
carbon-14

Answer & Explanation

Correct Option: B

Americium-241 ionizes the air in a chamber; smoke particles disrupt this current, triggering the alarm.
Question 388 Discuss
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The 'Kjeldahl's Method' is used for the estimation of which element in organic compounds?

A
carbon
B
hydrogen
C
nitrogen
D
sulfur

Answer & Explanation

Correct Option: C

It involves digesting the organic compound with sulphuric acid to convert Nitrogen into ammonium sulphate.
Question 389 Discuss
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Which of the following describes 'Enthalpy' (H)?

A
h = u + pv
B
h = u - pv
C
h = g + ts
D
h = w + q

Answer & Explanation

Correct Option: A

Enthalpy is defined as the sum of internal energy and the product of pressure and volume.
Question 390 Discuss
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Which indicator is best suited for the titration of a 'strong acid' and a 'weak base'?

A
phenolphthalein
B
methyl orange
C
litmus
D
thymol blue

Answer & Explanation

Correct Option: B

Strong acid-weak base titrations have an equivalence point in the acidic range (pH < 7), where methyl orange works best.
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