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 321 Discuss
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Which gas has the odor of 'Rotten Fish'?

A
phosphine
B
ammonia
C
hydrogen sulphide
D
carbon monoxide

Answer & Explanation

Correct Option: A

Pure phosphine (PH3) is odorless, but impurities give it a decaying fish smell.
Question 322 Discuss
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Which of the following is a 'Radioactive Liquid'?

A
radium
B
uranium
C
francium
D
radon

Answer & Explanation

Correct Option: C

Francium is predicted to be a liquid or very soft metal near room temperature.
Question 323 Discuss
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What is the common name of 'Potassium Nitrate'?

A
saltpetre
B
caustic potash
C
pearl ash
D
borax

Answer & Explanation

Correct Option: A

KNO3 is called Saltpetre (Nitrate of Potash) and is used in fertilizers and explosives.
Question 324 Discuss
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Which of the following is used as 'Fuel' in jet aircrafts?

A
petrol
B
kerosene
C
diesel
D
lpg

Answer & Explanation

Correct Option: B

Aviation Turbine Fuel (ATF) is a highly refined form of kerosene.
Question 325 Discuss
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Which of the following is the 'Strongest Natural Acid'?

A
hydrochloric acid
B
nitric acid
C
sulphuric acid
D
fluoroantimonic acid

Answer & Explanation

Correct Option: D

Fluoroantimonic acid is a superacid, significantly stronger than pure sulfuric acid.
Question 326 Discuss
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Which element is found in 'Hemoglobin'?

A
magnesium
B
calcium
C
iron
D
zinc

Answer & Explanation

Correct Option: C

Iron is the central atom in the heme group of hemoglobin, responsible for oxygen transport.
Question 327 Discuss
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Which among the following is a 'Liquid' at room temperature?

A
lithium
B
sodium
C
gallium
D
magnesium

Answer & Explanation

Correct Option: C

Gallium has a very low melting point (approx 29.7°C) and can melt in the hand.
Question 328 Discuss
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What is the common name of 'Calcium Sulphate Hemihydrate'?

A
gypsum
B
plaster of paris
C
bleaching powder
D
limestone

Answer & Explanation

Correct Option: B

POP (CaSO4.1/2 H2O) is formed by heating gypsum at 373 K.
Question 329 Discuss
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Which gas is used in 'Neon Signs'?

A
helium
B
argon
C
neon
D
krypton

Answer & Explanation

Correct Option: C

Neon gives a bright reddish-orange glow when an electric discharge is passed through it.
Question 330 Discuss
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Which among the following is used as an 'Acid-Base Indicator' found in kitchen?

A
salt
B
turmeric
C
sugar
D
vinegar

Answer & Explanation

Correct Option: B

Turmeric turns reddish-brown in basic solutions (like soap) and remains yellow in acids.
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