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 41 Discuss
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What is the IUPAC name of the compound CH3NH2?

A
Propan-1-amine
B
Methanamine
C
2-Methyl propan-1-amine
D
Ethanamine

Answer & Explanation

Correct Option: B

In IUPAC nomenclature, the prefix 'meth-' indicates a single carbon atom, and the suffix '-amine' identifies the amino functional group.
Question 42 Discuss
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The reaction of an acid and a metal gives:

A
Hydrogen gas and salt
B
Carbon dioxide, salt and water
C
Salt and water
D
Carbon dioxide, salt and hydrogen gas

Answer & Explanation

Correct Option: A

Metals react with acids in a displacement reaction where the metal replaces hydrogen from the acid to form a salt.
Question 43 Discuss
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Which of the following devices is used to accelerate charged particles to high velocities?

A
cryotron
B
copatron
C
cosmotron
D
cyclotron

Answer & Explanation

Correct Option: D

Invented by Ernest Lawrence in 1929, the cyclotron uses magnetic and electric fields to accelerate particles in a spiral path.
Question 44 Discuss
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Which of the following contains small droplets of liquid or particles of solid dispersed in a gas?

A
Gel
B
Vapour
C
Aerosol
D
Foam

Answer & Explanation

Correct Option: C

An aerosol is a colloid where either a liquid or a solid is the dispersed phase and a gas is the dispersion medium.
Question 45 Discuss
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Which of the following planets' atmosphere is made up of thick white and yellowish clouds of sulphuric acid?

A
Venus
B
Neptune
C
Mars
D
Jupiter

Answer & Explanation

Correct Option: A

Venus has a dense atmosphere primarily composed of carbon dioxide with reflective clouds of sulfuric acid.
Question 46 Discuss
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Which scientist discovered the concept of atomic number through X-ray spectra in 1913?

A
AEB de Chancourtois
B
Dmitri Mendeleev
C
Henry Moseley
D
RA Millikan

Answer & Explanation

Correct Option: C

Henry Moseley's work proved that atomic number, rather than atomic mass, is the fundamental property for organizing the periodic table.
Question 47 Discuss
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Why is the six membered cyclic structure of glucose called a pyranose structure?

A
Pyran is a non-cyclic organic compound, with one oxygen atom and five carbon atoms in the ring.
B
Pyran is a cyclic organic compound, with one oxygen atom and five carbon atoms in the ring.
C
Furan is a five membered non-cyclic compound, with one oxygen and four carbon atoms.
D
Furan is a five membered cyclic compound, with one oxygen and four carbon atoms.

Answer & Explanation

Correct Option: B

Glucose forms a stable six-membered ring containing five carbons and one oxygen, resembling the chemical structure of pyran.
Question 48 Discuss
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The method of separating a mixture of soluble solids by dissolving them in a suitable hot solvent and then lowering the temperature slowly is called:

A
fractional crystallisation
B
dephlegmation
C
azeotropic distillation
D
sublimation

Answer & Explanation

Correct Option: A

Fractional crystallization exploits differences in the solubilities of compounds at varying temperatures to achieve separation.
Question 49 Discuss
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Which of the following statements best describes the Hardy Schulze rule?

A
liquid mixture is proportional to its mole fraction in that mixture.
B
The partial pressure of a component in
C
This is applied to obtain a colloidal solution of metals such as gold, silver or platinum.
D
The amount of electrolyte required for the coagulation of a definite amount of a colloidal solution is dependent on the valency of the coagulating ion.

Answer & Explanation

Correct Option: D

The rule states that the power of an ion to coagulate a colloid increases dramatically with the ion's valency.
Question 50 Discuss
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Which of the following reactions leads to the formation of glucose pentaacetate from acetic anhydride?

A
Acetylation of glucose
B
Oxidation
C
Addition of ketone
D
Reduction

Answer & Explanation

Correct Option: A

Acetylation of the five hydroxyl groups in glucose with acetic anhydride yields glucose pentaacetate, confirming the presence of five -OH groups.
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