Roasting

Q.

Question 65
Two ores A and B were taken. On heating, ore A gives ${\text{CO}}_2$ whereas, ore B gives ${\text{SO}}_2$. What steps will you take to convert them into metals ?

Q.

Sulphide ores are converted into oxides by the process of _____ .

1. calcination
2. roasting
3. simple heating
4. electrolysis

Q. Match the conversion in $ColumnI$ with the type(s) of reaction(s) given in $ColumnII$.
$$\begin{array}{cccc}& ColumnI& & ColumnII\\ A.& PbS⟶PbO& p.& Roasting\\ B.& CaC{O}_3⟶CaO& q.& Calcination\\ C.& ZnS⟶Zn& r.& Carbonreduction\\ D.& C{u}_{2}S⟶Cu& s.& Self-reduction\end{array}$$

1. $A.\to s;B.\to q;C.\to p,r;D.\to p,s.$
2. $A.\to p,s;B.\to q,r;C.\to p,r;D.\to p,s.$
3. $A.\to p,s;B.\to q;C.\to p,q,r;D.\to p,s.$
4. $A.\to p;B.\to q;C.\to p,r;D.\to p,s.$

Q.

An ore gives ${\mathrm{SO}}_2$ on heating. Name the method to enrich this one?

Q. Sulfide ores are common for the metals.
(IIT-JEE, 2013)

1. Ag, Cu and Pb
2. Ag, Cu and Sn
3. Ag, Mg and Pb
4. Al, Cu and Pb

Q.

Of the given options, choose the combination that contains metals whose ores are most appropriate for roasting. In other words, Sulphide ores are common for which kind of metals?

1. Ag, Cu, Pb

2. Ag, Cu, Sn

3. Ag, Mg, Pb

4. Al, Cu, Pb