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 11 Discuss
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Which polyatomic ionic compound is a white, crystalline powder used in fire extinguishers and to neutralise acids and bases?

A
Sodium Bisulphite
B
Sodium Thiosulphate
C
Sodium Chromate
D
Sodium Bicarbonate

Answer & Explanation

Correct Option: D

Sodium Bicarbonate (baking soda) releases carbon dioxide when heated, making it effective for extinguishing fires and neutralizing acids.
Question 12 Discuss
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Name the straight chain alkane having chemical formula C9H20, which is used as a research chemical and in making biodegradable detergents.

A
Nonane
B
Dodecane
C
Nonadecane
D
Icosane

Answer & Explanation

Correct Option: A

In organic chemistry nomenclature, the prefix 'non-' denotes a chain of nine carbon atoms, matching the formula C9H20.
Question 13 Discuss
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Which of the following is a saturated hydrocarbon?

A
C3H8
B
C6H6
C
C2H4
D
C4H8

Answer & Explanation

Correct Option: A

C3H8 (Propane) is a saturated hydrocarbon because it follows the general alkane formula CnH2n+2 and contains only single bonds.
Question 14 Discuss
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Which of the following is NOT a greenhouse gas?

A
Carbon Dioxide
B
Methane
C
Nitrous Oxide
D
Nitrogen

Answer & Explanation

Correct Option: D

Nitrogen makes up 78% of the atmosphere but does not trap heat, unlike greenhouse gases which absorb infrared radiation.
Question 15 Discuss
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Which of the following radiations is primarily blocked by the ozone layer?

A
Gamma
B
Infra-red
C
Microwave
D
Ultraviolet

Answer & Explanation

Correct Option: D

Ozone molecules absorb high-energy ultraviolet radiation from the sun, protecting life on Earth from genetic damage.
Question 16 Discuss
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When electricity is passed through water, what kind of chemical reaction occurs?

A
Decomposition
B
Displacement
C
Double displacement
D
Combination

Answer & Explanation

Correct Option: A

Electrolysis of water is a decomposition reaction where electrical energy breaks water molecules into hydrogen and oxygen gases.
Question 17 Discuss
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Which of the following statements are true based on the 4NH3( g)+5O2( g) → 4NO(g) +6H2O(g) ?

A
N gets oxidized.
B
O gets oxidized.
C
N gets reduced.
D
O gets reduced.

Answer & Explanation

Correct Option: A

Nitrogen is oxidized because its oxidation state increases from -3 in ammonia to +2 in nitric oxide during the reaction.
Question 18 Discuss
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Which of the following elements is used as a sacrificial anode to protect iron from rusting?

A
sodium
B
aluminium
C
magnesium
D
beryllium

Answer & Explanation

Correct Option: C

Magnesium is more reactive than iron, so it corrodes first when connected to iron, effectively protecting the iron from oxidation.
Question 19 Discuss
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Which of the following statements is INCORRECT?

A
Fats and oils get reduced over time and smell bad.
B
Fats and oils are oxidised, they become rancid.
C
Antioxidants are added to foods containing fats and oil to prevent oxidation.
D
Chips manufacturers usually flush bags of chips with Nitrogen to prevent the chips from getting ranicid.

Answer & Explanation

Correct Option: A

Fats and oils undergo oxidation, not reduction, which causes the development of foul odors and tastes known as rancidity.
Question 20 Discuss
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Ernest Rutherford used about ____ thick gold foil for alpha scattering experiments.

A
500 atoms
B
1000 atoms
C
900 atoms
D
700 atoms

Answer & Explanation

Correct Option: B

Rutherford selected gold foil because it could be hammered into an incredibly thin layer, approximately 1000 atoms thick.
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