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 231 Discuss
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The 'Gold Number' is related to which of the following properties of colloids?

A
electrophoresis
B
protective power
C
coagulation
D
tyndall effect

Answer & Explanation

Correct Option: B

The Gold Number measures the protective action of lyophilic colloids in preventing the coagulation of a gold sol.
Question 232 Discuss
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What is the oxidation number of Chromium in K2Cr2O7?

A
+3
B
+5
C
+6
D
+7

Answer & Explanation

Correct Option: C

2(+1) + 2x + 7(-2) = 0 results in 2x = 12, so x = +6.
Question 233 Discuss
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Which of the following fuels has the highest calorific value?

A
coal
B
petrol
C
lpg
D
hydrogen

Answer & Explanation

Correct Option: D

Hydrogen has the highest calorific value (approx 150 kJ/g), making it a highly efficient fuel.
Question 234 Discuss
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Which catalyst is used in the manufacture of Sulphuric acid by the Contact process?

A
iron
B
platinum or vanadium pentoxide
C
nickel
D
manganese dioxide

Answer & Explanation

Correct Option: B

Vanadium pentoxide (V2O5) is commonly used to catalyze the oxidation of SO2 to SO3.
Question 235 Discuss
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Which law states that at constant temperature, the solubility of a gas in a liquid is directly proportional to its partial pressure?

A
boyles law
B
charles law
C
henrys law
D
daltons law

Answer & Explanation

Correct Option: C

Henry's Law explains the effect of pressure on gas solubility in liquids, relevant for carbonated drinks.
Question 236 Discuss
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Bakelite is a polymer of:

A
ethylene glycol and phthalic acid
B
phenol and formaldehyde
C
vinyl chloride
D
adipic acid and hexamethylenediamine

Answer & Explanation

Correct Option: B

Bakelite is a thermosetting phenol-formaldehyde resin used for electrical switches and pot handles.
Question 237 Discuss
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Which of the following is responsible for the 'rotten egg' smell of sewer gas?

A
ammonia
B
methane
C
hydrogen sulphide
D
carbon monoxide

Answer & Explanation

Correct Option: C

Hydrogen Sulphide (H2S) is a colorless gas with a characteristic odor of decaying organic matter.
Question 238 Discuss
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When an iron nail is dipped in copper sulphate solution, the color of the solution changes from blue to green due to the formation of:

A
copper oxide
B
iron sulphate
C
iron oxide
D
copper chloride

Answer & Explanation

Correct Option: B

Iron is more reactive than copper; it displaces copper from CuSO4 to form light-green FeSO4.
Question 239 Discuss
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Which of the following acids is present in red ants?

A
acetic acid
B
citric acid
C
formic acid
D
oxalic acid

Answer & Explanation

Correct Option: C

Formic acid (Methanoic acid) is injected by red ants when they bite.
Question 240 Discuss
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The radioactive element most commonly used in cardiac pacemakers is:

A
uranium-235
B
plutonium-238
C
radium-226
D
deuterium

Answer & Explanation

Correct Option: B

Plutonium-238 is used in radioisotope thermoelectric generators for long-lived medical devices.
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