50
MCQ (Single Correct Answer)
Assertion (A) Nickel can be purified by Mond's process.
Reason (R) $\mathrm{Ni}(\mathrm{CO})_4$ is a volatile compound which decomposes at 460 K to give pure Ni.
A
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Assertion is false but reason is true.
E
Assertion and reason both are wrong.
51
MCQ (Single Correct Answer)
Assertion (A) Zirconium can be purified by van Arkel method.
Reason (R) $\mathrm{ZrI}_4$ is volatile and decomposes at 1800 K .
A
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Assertion is false but reason is true.
E
Assertion and reason both are wrong.
52
MCQ (Single Correct Answer)
Assertion (A) Sulphide ores are concentrated by froth flotation method.
Reason (R) Cresols stabilise the froth in froth floatation method.
A
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Assertion is false but reason is true.
E
Assertion and reason both are wrong.
53
MCQ (Single Correct Answer)
Assertion (A) Zone refining method is very useful for producing semiconductors.
Reason (R) Semiconductors are of high purity.
A
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Assertion is false but reason is true.
E
Assertion and reason both are wrong.
54
MCQ (Single Correct Answer)
Assertion (A) Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal.
Reason (R) Copper is extracted by hydrometallurgy.
A
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Assertion is false but reason is true.
E
Assertion and reason both are wrong.