Ores and Minerals

Q.

Distinguish between the ferrous and nonferrous minerals.

Q.

What are the uses for aluminum bromate?

Q. Sulphide ores are common for the metals:

1. Ag, Cu and Pb

2. Ag, Cu and Sn

3. Ag, Mg and Pb

4. Al, Cu and Pb

Q.

Answer the following question:

Name the impurity present in Emerald.

Q. Match the following ores with their ore types

1. Gypsum
2. Galena
3. Horn silver
4. Cuperite

Q. Match the anionic species given in Column I that are present in the ore(s) given in the column II:

$$\begin{array}{cccc}& ColumnI& & ColumnII\\ A.& Carbonate& p.& Siderite\\ B.& Sulphide& q.& Malachite\\ C.& Hydroxide& r.& Bauxite\\ D.& Oxide& s.& Calamine\\ & & t.& Argentite\end{array}$$

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

Q. $A$ and $B$ are two ores of copper.
$A$ undergoes calcination to form a solid, $C{O}_{2\left(g\right)}$ and $O_{2\left(g\right)}$
$B$ undergoes roasting to form a solid and a gas $C$ which turns acidified $K_{2}C{r}_2{O}_7$ to green solution.
$B$ also reacts with dil $HCl$ to form a solid and gas $D$ which turns lead acetate solution black. $D$ also reacts with $C$ to form colloidal sulphur in the presence of moisture.

The copper ores $A$ and $B$ respectively are:

1. Carbonate and hydroxide
2. Carbonate and oxide
3. Carbonate and sulphide
4. Sulphide and carbonate

Q. Which ore is malachite among the following?

1. $CuFe{S}_2$
2. $Cu(OH{)}_2$
3. $F{e}_3{O}_4$
4. $CuC{O}_3.Cu(OH{)}_2$

Q.

Salts that are least likely to be found in minerals are:

1. Carbonates

2. Sulphates

3. Nitrates

4. Sulphides

Q.

Salts that are least likely to be found in minerals are:

1. Carbonates

2. Sulphates

3. Nitrates

4. Sulphides

Q.

What do you mean by the Free State?

1. Elements in their compound form

2. Elements existing as gases

3. Elements existing in very pure and stable forms

4. Elements existing as elements but mixed with impurities

Q.

Pick the odd one out

1. Sodium borohydride reacts very violently with cold water to produce $H_2$

2. Sodium borohydride reacts very slowly with cold water

3. Solubility of sodium borohydride in water at ${25}^{\circ }$C is $10.05gm{L}^{-1}$

4. Melting point of sodium borohydride is ${500}^{\circ }C$

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) s; (b) p; (c) q; (d) r

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

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

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