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 471 Discuss
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The 'Faraday's Constant' (F) is approximately:

A
96500 C/mol
B
6.023 x 10^23 C/mol
C
1.6 x 10^-19 C/mol
D
8.314 J/mol K

Answer & Explanation

Correct Option: A

Faraday's constant represents the charge of one mole of electrons.
Question 472 Discuss
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Which among the following is a 'weak acid'?

A
hcl
B
hno3
C
h2so4
D
ch3cooh

Answer & Explanation

Correct Option: D

Acetic acid does not fully dissociate in water, unlike the strong mineral acids listed.
Question 473 Discuss
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The 'Octet Rule' is not followed in which of the following?

A
ch4
B
nh3
C
pcl5
D
h2o

Answer & Explanation

Correct Option: C

Phosphorus in PCl5 has 10 valence electrons, representing an expanded octet.
Question 474 Discuss
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What is the primary constituent of 'Limestone'?

A
calcium oxide
B
calcium carbonate
C
calcium chloride
D
calcium sulphate

Answer & Explanation

Correct Option: B

Limestone consists mainly of CaCO3, used in construction and the steel industry.
Question 475 Discuss
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Which of the following has 'sp2' hybridisation?

A
ethane
B
ethene
C
ethyne
D
methane

Answer & Explanation

Correct Option: B

Ethene ($C_2H_4$) contains a double bond where carbon atoms are trigonal planar.
Question 476 Discuss
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The 'Raoult's Law' deals with:

A
solubility of gases in liquids
B
vapor pressure of solutions
C
osmotic pressure
D
diffusion of gases

Answer & Explanation

Correct Option: B

It states that the partial vapor pressure of a component is proportional to its mole fraction in the solution.
Question 477 Discuss
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Which of the following is an 'addition reaction'?

A
methane + chlorine
B
ethene + hydrogen
C
ethanol + sodium
D
benzene + nitric acid

Answer & Explanation

Correct Option: B

Hydrogenation of ethene to ethane is a classic addition across a double bond.
Question 478 Discuss
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Which among the following is used in the 'Manufacture of Nylon 6'?

A
adipic acid
B
caprolactam
C
phthalic acid
D
vinyl cyanide

Answer & Explanation

Correct Option: B

Nylon 6 is produced by the ring-opening polymerization of caprolactam.
Question 479 Discuss
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The 'Avogadro's Number' represents the number of particles in:

A
1 kg of substance
B
1 g of substance
C
1 mole of substance
D
1 liter of substance

Answer & Explanation

Correct Option: C

Avogadro's number ($6.022 imes 10^{23}$) defines the quantity of particles in one mole.
Question 480 Discuss
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Which of the following is used as 'flux' in the extraction of iron?

A
silica
B
limestone
C
coke
D
hematite

Answer & Explanation

Correct Option: B

Limestone decomposes to CaO, which reacts with silica impurities to form slag.
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