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

General Science

jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 451 Discuss
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The 'Entropy' of the universe is constantly:

A
decreasing
B
increasing
C
remaining constant
D
fluctuating

Answer & Explanation

Correct Option: B

The Second Law of Thermodynamics states that for any spontaneous process, the total entropy increases.
Question 452 Discuss
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What is the hybridisation of Xenon in 'XeF4'?

A
sp3
B
sp3d
C
sp3d2
D
sp2

Answer & Explanation

Correct Option: C

XeF4 has 4 bond pairs and 2 lone pairs, resulting in $sp^3d^2$ hybridisation and a square planar shape.
Question 453 Discuss
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Which of the following is a 'reducing sugar'?

A
sucrose
B
glucose
C
starch
D
cellulose

Answer & Explanation

Correct Option: B

Glucose has a free aldehyde group that can reduce Tollen's or Fehling's reagents; Sucrose does not.
Question 454 Discuss
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The 'Permanent Hardness' of water is due to the presence of:

A
bicarbonates of Ca and Mg
B
chlorides and sulphates of Ca and Mg
C
carbonates of Na and K
D
nitrates of silver

Answer & Explanation

Correct Option: B

Unlike temporary hardness, permanent hardness cannot be removed by simple boiling.
Question 455 Discuss
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Which process involves the 'Heating of Ore' in a limited supply of air?

A
calcination
B
roasting
C
smelting
D
leaching

Answer & Explanation

Correct Option: A

Calcination expels moisture and volatile matter without oxidizing the primary metal core.
Question 456 Discuss
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The 'Equilibrium Constant' ($K_c$) depends only on:

A
initial concentration
B
pressure
C
temperature
D
catalyst

Answer & Explanation

Correct Option: C

A change in temperature changes the value of $K_c$ for a specific reaction.
Question 457 Discuss
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Which of the following describes 'Dalton's Atomic Theory' incorrectly?

A
atoms are indivisible
B
atoms of the same element are identical
C
atoms can be created in lab
D
atoms combine in simple ratios

Answer & Explanation

Correct Option: C

Dalton stated that atoms can neither be created nor destroyed in a chemical reaction.
Question 458 Discuss
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Which of the following elements is used as a 'doped' impurity in n-type semiconductors?

A
boron
B
aluminum
C
phosphorus
D
indium

Answer & Explanation

Correct Option: C

n-type semiconductors are formed by adding pentavalent impurities (P, As) which provide extra electrons.
Question 459 Discuss
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Which of the following is used as an 'anti-septic' in mouthwashes?

A
aspirin
B
hydrogen peroxide
C
acetic acid
D
methyl salicylate

Answer & Explanation

Correct Option: B

Dilute H2O2 is used as a mild antiseptic and oxidizing agent for oral hygiene.
Question 460 Discuss
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The 'Degree of Dissociation' of a weak electrolyte increases with:

A
increase in concentration
B
increase in dilution
C
decrease in temperature
D
addition of common ion

Answer & Explanation

Correct Option: B

According to Ostwald's Dilution Law, the degree of dissociation is inversely proportional to the square root of concentration.
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