48
MCQ (Single Correct Answer)
Match the items of Column I with the items of Column II nd assign the correct code.
| Column I | Column II | ||
|---|---|---|---|
| A. | Sapphire | 1. | $\mathrm{Al_2O_3}$ |
| B. | Sphalerite | 2. | $\mathrm{NaCN}$ |
| C. | Depressant | 3. | $\mathrm{Co}$ |
| D. | Corundum | 4. | $\mathrm{ZnS}$ |
| 5. | $\mathrm{Fe_2O_3}$ |
A
A - 3, B - 4, C - 2, D - 1
B
A - 5, B - 4, C - 3, D - 2
C
A - 2, B - 3, C - 4, D - 5
D
A - 1, B - 2, C - 3, D - 4
49
MCQ (Single Correct Answer)
Match the items of Column I with items of Column II and assign the correct code.
| Column I | Column II | ||
|---|---|---|---|
| A. | Blisterred Cu | 1. | Aluminium |
| B. | Blast furnace | 2. | $\mathrm{2Cu_2O+Cu_2S\longrightarrow 6Cu+SO_2}$ |
| C. | Reverberatory furnace | 3. | Iron |
| D. | Hall-Heroult process | 4. | $\mathrm{FeO+SiO_2\longrightarrow FeSiO_3}$ |
| 5. | $\mathrm{2Cu_2S+3O_2\longrightarrow 2Cu_2O+2SO_2}$ |
A
A - 2, B - 3, C - 4, D -1
B
A - 1, B - 2, C - 3, D - 5
C
A - 5, B - 4, C - 3, D -2
D
A - 4, B - 5, C - 3, D -2
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.