Smelting

Q.

While your siblings are eagerly anticipating their first batches of Gold and diamond, you are still yet to get a single gram of copper! Armed with the know-how of extracting copper, you smelt the calcine from the roasting process in a blast furnace. What is the smelt composed of?

1. Pure Cu metal

2. Crude Cu metal

3. $C{u}_{2}S$ and FeS

4. Matte Copper

Q.

Assertion – The non-fusible impurities present in iron ore are removed by $CaC{O}_3$ .

Reason: $CaC{O}_3$ which decomposes into $CaO$ and $C{O}_2$. The $CaO$ formed reacts with $Si{O}_2$ to remove silica

1. Both assertion and reason are correct and the reason is the correct explanation for the assertion.

2. Both assertion and reason are correct but reason is not the correct explanation for the assertion.

3. Assertion is correct but reason is wrong

4. Assertion is incorrect but reason is correct

5. Both assertion and reason are wrong.

Q. What will be the volume of $C{O}_2$ at STP (atm) obtained on heating 10 grams of 90% pure limestone?

1. $22.4\text{L}$
2. $2.02\text{L}$
3. $2.24\text{L}$
4. $20.2\text{L}$

Q. Metals which can be extracted by smelting process is/are:

1. $Sn$
2. $Cu$
3. $Zn$
4. $Al$

Q. Which of the following reactions occur in blast furnace during the extraction of iron?

1. $CaO+Si{O}_2\to CaSi{O}_3$
2. $F{e}_2{O}_3+CO\to 2FeO+C{O}_2$
3. $FeO+CO\to Fe+2CO$
4. All of the above

Q.

The smelting of iron in a blast furnace involves the following process

1. Combustion

2. Reduction

3. Slag formation

4. Sublimation