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 421 Discuss
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The 'Saponification Value' is used to determine the:

A
acidity of fat
B
average molecular weight of fat
C
unsaturation in fat
D
purity of alcohol

Answer & Explanation

Correct Option: B

It indicates the number of milligrams of KOH needed to saponify 1g of fat; higher value means shorter fatty acid chains.
Question 422 Discuss
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Which of the following is 'Heavy Water' used for in nuclear reactors?

A
coolant and moderator
B
fuel
C
shielding material
D
control rod material

Answer & Explanation

Correct Option: A

Heavy water slows down fast neutrons and transfers heat away from the reactor core.
Question 423 Discuss
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Which among the following is a 'Heterogeneous' mixture?

A
brass
B
air
C
oil and water
D
salt solution

Answer & Explanation

Correct Option: C

Oil and water are immiscible and form two distinct phases, making them heterogeneous.
Question 424 Discuss
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What is the common name of 'Carbonyl Chloride'?

A
phosgene
B
teargas
C
mustard gas
D
laughing gas

Answer & Explanation

Correct Option: A

Phosgene ($COCl_2$) is a highly toxic colorless gas used as a chemical weapon in WWI.
Question 425 Discuss
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Which of the following is not a 'Synthetic Fiber'?

A
rayon
B
nylon
C
polyester
D
jute

Answer & Explanation

Correct Option: D

Jute is obtained from the stem of the jute plant and is biodegradable.
Question 426 Discuss
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The 'Lattice Energy' of an ionic compound increases when:

A
ionic radii increase
B
charges on ions increase
C
inter-ionic distance increases
D
atomic weight increases

Answer & Explanation

Correct Option: B

Lattice energy is directly proportional to the product of charges ($Q_1Q_2$) and inversely proportional to distance.
Question 427 Discuss
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Which of the following elements has the lowest 'electronegativity' on the Pauling scale?

A
fluorine
B
cesium
C
helium
D
oxygen

Answer & Explanation

Correct Option: B

Cesium is the most electropositive and least electronegative stable element.
Question 428 Discuss
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The 'Tyndall effect' is most clearly observed in which of the following?

A
true solution
B
suspension
C
colloidal solution
D
saturated solution

Answer & Explanation

Correct Option: C

Colloidal particles are large enough to scatter light but small enough to remain dispersed.
Question 429 Discuss
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What is the 'pH' of a 0.01 M NaOH solution?

A
2
B
10
C
12
D
14

Answer & Explanation

Correct Option: C

[OH-] = 10^-2, so pOH = 2. Since pH + pOH = 14, pH = 12.
Question 430 Discuss
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Which gas is released when 'Calcium Carbide' reacts with water?

A
methane
B
ethene
C
ethyne
D
butane

Answer & Explanation

Correct Option: C

$CaC_2 + 2H_2O
ightarrow Ca(OH)_2 + C_2H_2$ (acetylene/ethyne).
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