Ores and Minerals

Q. 52. give the hybridisation and shape of [Cu(NH3)4]2+

Q.

What is blue vitriol?

Q.

What is the color of Potassium iodide?

Q.

What is an ore?

Q. In the leaching of Alumina from bauxite, concentration of the ore is done by digesting the powdered ore with $NaOH$ and then it is later reacted with $C{O}_2$ gas. Consider the major impurities presents related to them.

I. $Si{O}_2$ is leached out along with $A{l}_2{O}_3$ as silicate and aluminate on reaction with $NaOH$.

II. Iron oxides and titanium oxide are insoluble in $NaOH$ and are left behind as impurity.

III. On passing $C{O}_2$, the silicate is precipitated leaving aluminate in the filtate from which Alumina can be recovered.

The correct statements from the ones given are

1. II and III only
2. I and II only
3. I and III only
4. I, II and III

Q.

What is the chemical formula of Nickel bisulfate?

Q.

Which of the following ore contains iron and copper?

1. Malachite

2. Azurite

3. Copper pyrite

4. None of these

Q. (a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

Q.

A sulphate salt of the group $2$ element of the Periodic table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound is left in the open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt, and why does it show such behaviour? Give the reaction involved.

Q.

The froth flotation process is best suited for the purification of sulphide ores. Give reason.

Q. A glassy bead formed by heating borax on a platinum wire loop is

1. Sodium tetraborate
2. Sodium metaborate
3. Sodium metaborate and boric anhydride
4. Boric anhydride and sodium tetraborate

Q.

What is the formula for common salt?

Q. Blister copper is refined by stirring molten impure metal with green logs of wood because such woods liberate gases (like $C{H}_4$ ). This process X is called , and it is used to purify the metal that initially contain impurities of the oxide Y. X and Y can be:

1. X = poling, $Y=Sn{O}_2$
2. X = cupellation. Y = CuO
3. X = cupellation, Y = ZnO
4. X = poling, Y = CuO

Q. ( Which of the following oxide is thermally least stable(2) Al2O3(4) Ag2O(1) CaO(3) Fe2O3

Q.

Write the principle behind the froth floatation process. What is the role of collectors in this process?

Q. Calamine, malachite, magnetite and cryolite, respectively are:

1. $ZnC{O}_3,CuC{O}_3.Cu(OH{)}_2,F{e}_3{O}_4,N{a}_{3}Al{F}_6$
2. $ZnS{O}_4,CuC{O}_3,F{e}_2{O}_3,Al{F}_3$
3. $ZnC{O}_3,CuC{O}_3,F{e}_2{O}_3,N{a}_{3}Al{F}_6$
4. $ZnS{O}_4,Cu(OH{)}_2,F{e}_3{O}_4,N{a}_{3}Al{F}_6$

Q. How many of the following ores belong to either aluminium or copper?
Bauxite, Siderite, Diaspore, Cuprite, Malachite, Carborundum, Kaolinite, Azurite,
Calamine, Cerussite, Cassiterite, Dolomite

Q.

The dihydrate of calcium sulphate is commercially known as ______.

Q. What is the value of Z ( rank ) for Diamond?

Q.

Why Metal Extraction Is A Reduction Process?

Q. 24. Is froth flotation process employed ONLY for sulphide ores?

Q. One mole of anhydrous salt AB dissolves in water and liberates 15 J/mol of heat. The value of DH^°(hydration) of AB is -20.5 J/mol. Hence the dissolution of hydrated salt AB.3H2O (S) is 1) 5.5 J/mol 2) -5.5 J/mol 3) -35.5 J/mol 4) 35.5 J/mol

Q.

Alkaline earth metals show by losing electrons.

Q. Refining of impure copper with zinc impurity is to be done. The appropriate electrodes are:

1. Cathode- Pure Copper
   Anode - Pure Zinc
2. Cathode- Pure Zinc
   Anode - Pure Copper
3. Cathode- Pure Copper
   Anode - Impure Copper
4. Cathode- Pure Zinc
   Anode - Impure Zinc

Q.

Differentiate between minerals' and ores'.

Q.

Write the composition and uses of the following alloys:

1. Brass
2. Solder
3. Duralumin

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.

Why does hydrogen go to the negative electrode?

Q.

What is the role of carbon monoxide in the purification of nickel

Q.

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