Ores and Minerals

Q.

Question 11
Which of the following metals exist in their native state in nature?
(i) $\text{Cu}$
(ii) $\text{Au}$
(iii) $\text{Zn}$
(iv) $\text{Ag}$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

Q.

A mineral is called ore if

1. the metal extracted is costly

2. the metal can be extracted from it

3. a metal can be profitably extracted from it

4. a metal can not be extracted from it

Q. Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It thermally decomposes the carbonate.
$A\stackrel{Calcination}{\to }CaO+MgO+2C{O}_2$
find out A:

1. $CaC{O}_3$
2. $MgC{O}_3$
3. $CaC{O}_3.MgC{O}_3$
4. $CaS{O}_4.MgC{O}_3$

Q.

Question 12
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) $Au$
(ii) $Cu$
(iii) $Na$
(iv) $K$

(a) (i) and (ii) (b) (i) and (iii)

(c) (ii) and (iii) (d) (iii) and (iv)

Q. Match the column:
$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& Anglesite& \left(p\right)& Sulphateore\\ \left(b\right)& Galena& \left(q\right)& Sulphideore\\ \left(c\right)& Cerussite& \left(r\right)& OreofPb\\ \left(d\right)& Cinnabar& \left(s\right)& Carbonateore\\ & & \left(t\right)& OreofHg\end{array}$

1. (a) p, r; (b) q, r; (c) r, s (d) q, t
2. (a) q, t; (b) q, r; (c) r, s (d) p, r
3. (a) p, r; (b) q, r; (c) q, t (d) r, s
4. (a) q, r; (b) p, r; (c) r, s (d) q, t

Q.

Name the metal which is extracted from the calamine ore.

Q.

Match the column (for electrolytic refining of Cu):
$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& Anode& \left(p\right)& ThinsheetsofpureCu\\ \left(b\right)& Cathode& \left(q\right)& Anaqueoussolutionofcoppersulphatecontaining{H}_{2}S{O}_4\\ \left(c\right)& Electrolyte& \left(r\right)& Ag,Au\\ \left(d\right)& Anodemud& \left(s\right)& ImpuremetalofCu\end{array}$

1. (a) p; (b) s; (c) q; (d) r

2. (a) r; (b) p; (c) q; (d) s

3. (a) s; (b) r; (c) q; (d) p

4. (a) s; (b) p; (c) q; (d) r

Q.

Match Column I with Column II with reference to Haber's process:

$$\begin{array}{cccc}& ColumnI& & ColumnII\\ A.& Catalyst& p.& BoschProcess\\ B.& Promotor& q.& Quicklime\\ C.& DryingofAmmonia& r.& AluminiumOxide\\ D.& UseOfHydrogengas& s.& Finelydividediron\end{array}$$

1. A $⟶$ p; B $⟶$ s; C $⟶$ r; D $⟶$ q

2. A $⟶$ s; B $⟶$ q; C $⟶$ r; D $⟶$ p

3. A $⟶$ s; B $⟶$ r; C $⟶$ q; D $⟶$ p

4. A $⟶$ p; B $⟶$ s; C $⟶$ r; D $⟶$ q

Q. Differentiate hydrate and anhydrous salts with examples.​

Q.

From the given set of minerals, the number of ores of copper is/are ___
Chalcocite, pyrargyrite, cuprite, carnallite, covellite, sphalerite, azurite, malachite, cryolite

Q. Chromite is concentrated by:

1. chemical separation
2. froth floatation
3. hydraulic washing
4. magnetic separation

Q. Compare the chemical properties of metals and non-metals with reference to discharge of ions at the respective electrodes :

1. both deposit at cathode
2. both deposit at anode
3. non metals deposit at anode while metal deposit at cathode
4. metals deposit at anode while non metal deposit at cathode

Q.

Explain the difference between ores and minerals?

Q. Percentage composition of zinc in sodium zincate

Q. Sulphide ores are common for the metals:

1. Al, Cu and Pb

2. Ag, Cu and Pb

3. Ag, Cu and Sn

4. Ag, Mg and Pb

Q. The concentration of chromite ($FeO.C{r}_2{O}_3$) is done by which method?

1. Leaching process
2. Calcination
3. Magnetic separation
4. Froth - Flotation

Q. The most important ore of tin is:

1. cassiterite
2. cryolite
3. cerussite
4. none of these

Q. Extraction of metal from the ore cassiterite involves
(IIT-JEE, 2011)

1. Carbon reduction of an oxide ore
2. Self-reduction of sulphide ore
3. Removal of copper impurity
4. Removal of iron impurity

Q.

Predict which of the formulae are not correct for the given compounds: Correct the wrong ones.
Cadmium iodide : ${\mathrm{CdI}}_3$