Minerals, Ores and their Formation

Q.

Why is Aluminium used to make aeroplanes?

Q.

What is an amalgam? State its use with an example.

Q.

What are the minimum and maximum percentages of steel used in columns, beams, and slabs?

Q.

What is the difference between Sulphur and Sulphide?

Q.

The incorrect statement(s) among (a) - (c) is (are):

(a)$\mathrm{W}\left(\mathrm{VI}\right)$ is more stable than$\mathrm{Cr}\left(\mathrm{VI}\right)$.

(b) In the presence of $\mathrm{HCl}$, permanganate titrations provide satisfactory results.

(c) Some Lanthanoid oxides can be used as Phosphors.

1. (a) only

2. (b) and (c) only

3. (a) and (b) only

4. (b) only

Q.

An alloy which does not contain copper is-

1. Magnalium

2. Bronze

3. Brass

4. German Silver

Q.

Which of the following alloy is used in making household utensils?

1. Stainless steel

2. Brass

3. Bronze

4. Duralumin

Q.

What is the chemical name for limestone, ${\mathrm{CaCO}}_3$?

Q. Less reactive metals such as magnesium, aluminum, zinc, and iron react with steam to liberate dihydrogen gas.

1. True
2. False

Q.

What is the composition of stainless steel?

Q.

Malachite is a mineral of: a) Aluminium b) Magnesium c) Iron d) Copper

1. Aluminum

2. Magnesium

3. Iron

4. Copper

Q.

Name the compounds of calcium which are used for making statues and buildings.

Q.

Name:

A metal used for making flexible water pipes.

Q.

Give the chemical formula of Calcium sulphate hemihydrate

Q.

Which of the following allotropic form of carbon used in making crucibles-

1. Diamond

2. Graphite

3. Fullerene

4. Coke

Q. A non metal forms only two oxides.One oxide on hydrolysis give an
acid.Identify the non metal.

Q.

Match the important chemicals given in Column (A) with the chemical formulae given in Column (B)

Column 1	Column 2
Plaster of Paris	$\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$
Gypsum	${\mathrm{CaSO}}_4.1/2{\mathrm{H}}_2\mathrm{O}$
Bleaching powder	${\mathrm{CaSO}}_4.2{\mathrm{H}}_2\mathrm{O}$
Slaked Lime	${\mathrm{CaOCl}}_2$

Q.

To Design The Body Of An Aircraft Aluminium Alloys Are Used. Give Reasons

Q.

Magnesium reacts vigorously with ______ and produces intense heat and forms magnesium oxide.

Q.

Which of the following are the properties of aluminum, which is essential for their uses in industries?

1. Low density

2. Strength

3. Corrosion-resistant

4. All the above

Q.

What is the chemical formula for calcium (II) nitrate?

Q.

(i) Non - metals are good conductors of heat and electricity.

1. True
2. False

Q.

Aircraft bodies are made up of .

Q. What is the formula of White vitriol ?

1. $ZnS{O}_4\cdot H_{2}O$
2. $ZnS{O}_4\cdot 4H_{2}O$
3. $ZnS{O}_4\cdot 6H_{2}O$
4. $ZnS{O}_4\cdot 7H_{2}O$

Q.

what is gypsum , coral and glass sand

Q.

Which of the following non-metal is the good conductor of electricity?

1. Graphite

2. Bromine

3. Phosphorus

4. Fluorine

Q.

Metal used to fill the hole at the base of all standard weights is _____.

Q. Names of some minerals are given below.
i. Haematite
ii. Bauxite
iii. Dolomite
(a) Identify the mineral of iron (Fe).
(b) Name the reducing agent mainly used in the extraction of iron from its ore.
(c) What is the role of powdered lime stone in the extraction process of iron?

Q.

A mineral from which a metal can be profitably recovered is called an ________.

Q.

Diamond is the hardest substance found in nature.

1. True
2. False