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 121 Discuss
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Select the name of the hydrocarbon with a structural formula CH3 − CH2 − CH2 − CH2 −CH2−CH3.

A
2-Methylpentane
B
n-Hexane
C
2,2-Dimethylbutane
D
3-methyl hexane

Answer & Explanation

Correct Option: B

The given structural formula displays a continuous, unbranched chain of exactly six carbon atoms. In formal IUPAC nomenclature, a straight-chain alkane possessing six carbons is universally designated as n-hexane.
Question 122 Discuss
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Which of the following is a CLOSED chain organic compound?

A
Ethane
B
Isobutane
C
Acetic acid
D
Cyclopropane

Answer & Explanation

Correct Option: D

Cyclopropane and cyclohexane are textbook examples of alicyclic or closed-chain compounds, as their carbon atoms connect directly to form a geometric ring. Ethane, isobutane, and acetic acid are all open-chain (aliphatic) compounds with no ring structures.
Question 123 Discuss
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Name the white precipitate formed in the reaction of sodium sulphate and barium chloride.

A
Sodium chloride
B
Sodium oxide
C
Barium hydroxide
D
Barium sulphate

Answer & Explanation

Correct Option: D

When aqueous solutions of sodium sulfate and barium chloride are mixed, a rapid double displacement reaction occurs. This historically common analytical reaction yields heavily insoluble barium sulfate, which crashes out of the solution as a distinct, cloudy white precipitate.
Question 124 Discuss
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The depositional pattern of CaCO3 and other materials that extend upwards from the floor of a limestone cavern is known as:

A
Stalactite
B
Dripstone
C
Stalagmite
D
Hatectite

Answer & Explanation

Correct Option: C

Stalagmites are speleothems that form upward from the floor of a limestone cave as calcium carbonate precipitates from mineral-rich water dripping from the ceiling. A historically helpful memory device is that stalagmites 'might' reach the roof, while stalactites hold 'tight' to the ceiling.
Question 125 Discuss
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Which of the following organic compounds is a benzenoid?

A
Aniline
B
Hexane
C
Propane
D
Acetaldehyde

Answer & Explanation

Correct Option: A

A benzenoid is a chemical compound that contains at least one intact, six-membered benzene ring within its molecular structure. Aniline is a classic benzenoid, consisting of a phenyl group (the benzene ring) directly attached to an amino group.
Question 126 Discuss
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Which of the following is the IUPAC name of m-Dichlorobenzene?

A
3,4-Dichlorobenzene
B
1,2-Dichlorobenzene
C
2,3-Dichlorobenzene
D
1,3-Dichlorobenzene

Answer & Explanation

Correct Option: D

In IUPAC nomenclature, the 'meta' (m-) prefix signifies that two functional substituents on a benzene ring are separated by exactly one carbon atom. Therefore, m-dichlorobenzene formally corresponds to the precise locants of 1,3-dichlorobenzene.
Question 127 Discuss
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2-Methylpropan-2-ol is commonly known as:

A
prim-propyl alcohol
B
tert-butyl alcohol
C
ethyl alcohol
D
methanol

Answer & Explanation

Correct Option: B

2-Methylpropan-2-ol is a tertiary alcohol where the reactive hydroxyl group is attached to a central carbon that is bonded to three other carbons. Its historical, and still widely accepted, common name in industry is tert-butyl alcohol.
Question 128 Discuss
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In the IUPAC name of a compound, the indicates the total number of carbon atoms present in the longest carbon chain belonging to the compound.

A
Word root
B
Prefix
C
Primary suffix
D
Secondary suffix

Answer & Explanation

Correct Option: A

In standard IUPAC nomenclature rules, the 'word root' (such as meth-, eth-, prop-, but-) explicitly identifies the number of carbon atoms present in the principal parent chain. The suffixes and prefixes subsequently identify functional groups and branched side chains.
Question 129 Discuss
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In which of the following years did Antoine Lavoisier discover the law of conservation of mass and state that mass is conserved in

A
1787
B
1786
C
1788
D
1789

Answer & Explanation

Correct Option: D

Antoine Lavoisier, widely considered the father of modern chemistry, formally defined the law of conservation of mass in his landmark 1789 textbook, 'Traité élémentaire de chimie'. He definitively proved through rigorous measurement that matter is neither created nor destroyed during a chemical reaction.
Question 130 Discuss
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H2 is a molecular formula indicating how many atoms are bonded in a single molecule of hydrogen gas?

A
5
B
4
C
3
D
2

Answer & Explanation

Correct Option: D

Hydrogen naturally exists as a highly stable diatomic gas under standard atmospheric conditions. The subscript '2' in its molecular formula (H2) explicitly indicates that two hydrogen atoms are covalently bonded together to form a single molecule.
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