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 31 Discuss
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The decomposition of gaseous Ammonia on a hot platinum surface is a ____ order reaction at high pressure.

A
two
B
zero
C
three
D
one

Answer & Explanation

Correct Option: B

At high pressures, the catalyst surface becomes completely saturated with reactant molecules, making the reaction rate independent of concentration.
Question 32 Discuss
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What is the IUPAC name of tertiarybutyl alcohol?

A
2-Methylpropan-2-ol
B
1-propylpropan-3-ol
C
1-Methylpropan-3-ol
D
1-ethylpropan-3-ol

Answer & Explanation

Correct Option: A

In IUPAC naming, the longest chain has three carbons (propan-ol) with a methyl group and hydroxyl group on the second carbon.
Question 33 Discuss
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Which of the following is a correct order of basicity for Group 1 hydroxides?

A
LiOH > NaOH > KOH > CsOH
B
LiOH > KOH > CsOH > NaOH
C
KOH > CsOH >NaOH >LiOH
D
CsOH > KOH >NaOH >LiOH

Answer & Explanation

Correct Option: D

Basicity increases down the group because the larger cation size leads to weaker attraction for the OH- ion, making it easier to release.
Question 34 Discuss
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Palladium on barium sulphate (Pd/BaSO4) is also known as:

A
a Hillman reaction catalyst
B
a Cannizzaro reaction catalyst
C
the Rosenmund catalyst
D
an aldol reaction catalyst

Answer & Explanation

Correct Option: C

The Rosenmund catalyst is a poisoned palladium catalyst used to selectively reduce acid chlorides to aldehydes.
Question 35 Discuss
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Which of the following decomposition reactions is NOT a redox reaction?

A
Decomposition of sodium bicarbonate
B
Decomposition of sodium hydride
C
Decomposition of potassium chlorate
D
Decomposition of calcium carbonate

Answer & Explanation

Correct Option: D

Decomposition of calcium carbonate into CaO and CO2 involves no change in the oxidation states of the atoms involved.
Question 36 Discuss
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An organic reaction used to convert an aryl diazonium salt into an aryl halide using a copper(I) halide catalyst is called:

A
Finkelstein reaction
B
Gattermann reaction
C
Sandmeyer reaction
D
Balz-Schiemann reaction

Answer & Explanation

Correct Option: C

The Sandmeyer reaction is a classic substitution method discovered in 1884 for synthesizing aryl halides from primary aromatic amines.
Question 37 Discuss
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Which of the following isotopes is used as fuel in nuclear reactors?

A
Uranium-235
B
Arsenic-74
C
Carbon-14
D
Sodium-24

Answer & Explanation

Correct Option: A

Uranium-235 is a fissile isotope that can sustain a nuclear chain reaction, providing the energy for power generation.
Question 38 Discuss
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Identify a carbohydrate that is considered a 'deoxysugar' and does not fit the general formula Cx(H2O)y.

A
Maltose
B
Sucrose
C
Fructose
D
Rhamnose

Answer & Explanation

Correct Option: D

Rhamnose has the formula C6H12O5, which does not follow the standard hydrate of carbon ratio, yet it is chemically classified as a carbohydrate.
Question 39 Discuss
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Which of the following is an example of a 'solid in a liquid' type of solution?

A
Tincture of iodine
B
Vinegar
C
Brass
D
Bronze

Answer & Explanation

Correct Option: A

Tincture of iodine is a medicinal solution created by dissolving solid iodine and potassium iodide in a liquid mixture of ethanol and water.
Question 40 Discuss
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Milk of magnesia is a suspension of ____ in water.

A
magnesium oxalate
B
magnesium hydroxide
C
magnesium chlorate
D
magnesium bromide

Answer & Explanation

Correct Option: B

Milk of magnesia is an antacid consisting of magnesium hydroxide particles suspended in water, which neutralizes excess stomach acid.
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