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 411 Discuss
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The 'Solvay Process' is used for the manufacture of:

A
sodium hydroxide
B
sodium carbonate
C
potassium hydroxide
D
calcium carbonate

Answer & Explanation

Correct Option: B

The Solvay process uses brine, ammonia, and limestone to produce Sodium Carbonate (Washing Soda).
Question 412 Discuss
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Which of the following is 'Paramagnetic' in nature?

A
n2
B
o2
C
h2
D
cl2

Answer & Explanation

Correct Option: B

According to Molecular Orbital Theory, Oxygen has two unpaired electrons in its antibonding orbitals.
Question 413 Discuss
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Which indicator is used for the titration of 'oxalic acid' against 'potassium permanganate'?

A
phenolphthalein
B
methyl orange
C
starch
D
no indicator (self-indicator)

Answer & Explanation

Correct Option: D

Potassium permanganate acts as a self-indicator; the first permanent pink color marks the endpoint.
Question 414 Discuss
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The 'Zeigler-Natta' catalyst is used in the polymerization of:

A
vinyl chloride
B
ethene
C
styrene
D
formaldehyde

Answer & Explanation

Correct Option: B

It is a mixture of titanium tetrachloride and triethylaluminium used to make high-density polyethylene (HDPE).
Question 415 Discuss
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Which among the following elements is most likely to show the '+7' oxidation state?

A
iron
B
manganese
C
chromium
D
cobalt

Answer & Explanation

Correct Option: B

Manganese has 5 d-electrons and 2 s-electrons, allowing it to reach +7 (e.g., in KMnO4).
Question 416 Discuss
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What is the role of 'Gypsum' in cement manufacture?

A
increases strength
B
reduces setting time
C
slows down setting rate
D
provides color

Answer & Explanation

Correct Option: C

Gypsum acts as a retarder, preventing cement from flash setting too quickly.
Question 417 Discuss
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The 'Bond Angle' in a methane molecule (CH4) is:

A
90 degrees
B
120 degrees
C
109 degrees 28 minutes
D
107 degrees

Answer & Explanation

Correct Option: C

Methane has a perfect tetrahedral geometry with sp3 hybridisation.
Question 418 Discuss
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Which of the following is not a 'Radioactive' element?

A
astatine
B
tellurium
C
francium
D
polonium

Answer & Explanation

Correct Option: B

Tellurium is a stable metalloid; Astatine, Francium, and Polonium are highly radioactive.
Question 419 Discuss
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The 'Critical Temperature' is the temperature above which a gas:

A
cannot be liquefied by pressure
B
cannot exist as a gas
C
solidifies immediately
D
becomes a plasma

Answer & Explanation

Correct Option: A

Above $T_c$, kinetic energy of molecules is too high for intermolecular forces to cause liquefaction.
Question 420 Discuss
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Which among the following is used as 'Gunpowder' component?

A
calcium carbonate
B
potassium nitrate
C
sodium hydroxide
D
magnesium sulphate

Answer & Explanation

Correct Option: B

Gunpowder is a mixture of charcoal, sulfur, and potassium nitrate (Saltpetre).
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