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 251 Discuss
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Which element is commonly used as a tracer in the diagnosis of thyroid disorders?

A
carbon-14
B
iodine-131
C
cobalt-60
D
uranium-238

Answer & Explanation

Correct Option: B

The thyroid gland absorbs iodine; radioactive Iodine-131 is used to image and treat thyroid issues.
Question 252 Discuss
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The blue color of the copper sulphate crystal is due to:

A
copper ions
B
sulphate ions
C
water of crystallization
D
impurities

Answer & Explanation

Correct Option: C

Anhydrous copper sulphate is white; it turns blue upon forming the pentahydrate complex with water.
Question 253 Discuss
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Which of the following is the most electronegative element?

A
chlorine
B
fluorine
C
oxygen
D
nitrogen

Answer & Explanation

Correct Option: B

Fluorine has the highest electronegativity value (4.0) on the Pauling scale.
Question 254 Discuss
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In the manufacture of Ammonia by Haber's process, the condition for maximum yield is:

A
high temperature and high pressure
B
low temperature and high pressure
C
high temperature and low pressure
D
low temperature and low pressure

Answer & Explanation

Correct Option: B

The reaction is exothermic and involves a decrease in volume; Le Chatelier's principle favors low T and high P.
Question 255 Discuss
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Which of the following salts is known as 'Epsom Salt'?

A
magnesium sulphate heptahydrate
B
copper sulphate pentahydrate
C
sodium carbonate decahydrate
D
calcium sulphate dihydrate

Answer & Explanation

Correct Option: A

Epsom salt is MgSO4.7H2O, used in bath salts and as a fertilizer.
Question 256 Discuss
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The main constituent of 'LPG' used in households is:

A
methane
B
butane
C
ethane
D
acetylene

Answer & Explanation

Correct Option: B

LPG is a mixture of propane and butane, with n-butane and isobutane being the major components.
Question 257 Discuss
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Which radioactive series is also known as the 'Actinium series'?

A
4n series
B
4n+1 series
C
4n+2 series
D
4n+3 series

Answer & Explanation

Correct Option: D

The Actinium series starts with U-235 and its mass numbers follow the formula 4n+3.
Question 258 Discuss
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Which among the following is a greenhouse gas that contains only carbon and fluorine?

A
methane
B
cfcs
C
tetrafluoromethane
D
carbon dioxide

Answer & Explanation

Correct Option: C

Tetrafluoromethane (CF4) is a perfluorocarbon (PFC) and a very potent greenhouse gas.
Question 259 Discuss
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Which of the following metals can be cut with a knife?

A
sodium
B
iron
C
copper
D
aluminium

Answer & Explanation

Correct Option: A

Alkali metals like Sodium and Potassium are soft and have low density, allowing them to be cut easily.
Question 260 Discuss
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What is the main component of 'Tear Gas'?

A
chlorine
B
chloropicrin
C
ammonia
D
ether

Answer & Explanation

Correct Option: B

Chloropicrin (nitrochloroform) or CS gas are the active chemicals used in tear gas for riot control.
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