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 391 Discuss
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The 'Plaster of Paris' hardens when mixed with water due to:

A
oxidation
B
hydration to gypsum
C
dehydration
D
carbonation

Answer & Explanation

Correct Option: B

POP absorbs water to reform the crystalline dihydrate, gypsum, which is hard and rigid.
Question 392 Discuss
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Which of the following gases is produced during the 'Chlor-alkali' process at the anode?

A
hydrogen
B
oxygen
C
chlorine
D
carbon dioxide

Answer & Explanation

Correct Option: C

Electrolysis of brine (NaCl) yields Chlorine at the anode and Hydrogen at the cathode.
Question 393 Discuss
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The process of heating an ore in the 'absence' of air below its melting point is called:

A
roasting
B
calcination
C
smelting
D
bessemerization

Answer & Explanation

Correct Option: B

Calcination is used mainly for carbonate ores to expel CO2 and convert them into oxides.
Question 394 Discuss
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Which of the following is the most effective 'coagulating agent' for a negative sol?

A
na+
B
mg2+
C
al3+
D
k+

Answer & Explanation

Correct Option: C

Hardy-Schulze rule states that higher the valency of the flocculating ion, the greater is its power to cause precipitation.
Question 395 Discuss
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What is the coordination number of 'Sodium' in its Body-Centered Cubic (BCC) crystal structure?

A
4
B
6
C
8
D
12

Answer & Explanation

Correct Option: C

In a BCC lattice, an atom at the center is surrounded by 8 atoms at the corners.
Question 396 Discuss
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Which of the following is a 'thermosetting' polymer?

A
pvc
B
polystyrene
C
bakelite
D
polyethene

Answer & Explanation

Correct Option: C

Thermosetting polymers like Bakelite undergo permanent chemical changes and cross-linking upon heating and cannot be remolded.
Question 397 Discuss
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The 'Ostwald's Process' is used for the industrial manufacture of:

A
nitric acid
B
sulphuric acid
C
hydrochloric acid
D
ammonia

Answer & Explanation

Correct Option: A

Ostwald's process involves the catalytic oxidation of ammonia to produce nitric acid.
Question 398 Discuss
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Which of the following is not an 'allotrope' of Sulfur?

A
rhombic sulfur
B
monoclinic sulfur
C
plastic sulfur
D
pyritic sulfur

Answer & Explanation

Correct Option: D

Rhombic and Monoclinic are crystalline allotropes; Plastic sulfur is amorphous. Pyritic sulfur is an ore (FeS2).
Question 399 Discuss
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The 'Molar Conductivity' of an electrolyte generally:

A
increases with dilution
B
decreases with dilution
C
remains constant
D
depends on temperature only

Answer & Explanation

Correct Option: A

With dilution, the degree of dissociation increases (for weak electrolytes) and ionic mobility increases, raising molar conductivity.
Question 400 Discuss
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Which of the following represents the 'Le Chatelier's Principle' correctly?

A
change in pressure affects solids
B
equilibrium shifts to counteract a change
C
catalysts shift equilibrium
D
temperature only affects rate

Answer & Explanation

Correct Option: B

If a system at equilibrium is disturbed, it adjusts to minimize the effect of that disturbance.
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