Ores and Mineral

Q. What happens when hydrogen gas is added to copper oxide?

Q.

Arrange the following elements in the order of their abundance in Earth's crust:

Aluminium - $Al$, Silicon - $Si$, Oxygen - $O$, Iron - $Fe$.

1. $O>Si>Al>Fe$
2. $O>Al>Si>Fe$
3. $O>Al>Fe>Si$
4. $Al>O>Fe>Si$

Q.

Calamine is an ore of

1. Iron

2. Aluminium

3. Copper

4. Zinc

Q.

The chemical name of main ore of iron is ___.

1. Iron(II) carbonate

2. Iron(II) oxide

3. Iron(III) carbonate

4. Iron(III) oxide

Q. Which among the following is a sulphide ore?

1. Haematite
2. Limestone
3. Magnetite
4. Zinc blende

Q.

Minerals from which metals are extracted are called:

1. Hydrocarbons

2. Alloys

3. Ores

4. Allotropes

Q.

The things made up of aluminum develop an Al₂O₃ layer. It acts as a protective layer. But iron oxide layer does not behave like this. Why? Explain

Q.

Haematite and magnetite are ores of:

1. aluminium

2. zinc

3. iron

4. magnesium

Q. Name 2 metals used to reduce metal oxides to metals

Q. Statement: The oxides of copper can be reduced into copper by heating alone.
Reason: Low active metals can be reduced easily by heating.

Which of the following holds true?

1. Both Statement and Reason are true but Reason is not the correct explanation for Statement.
2. Only Statement is true but the Reason is false.
3. Only Reason is true but the Statement is false.
4. Both Statement and Reason are true and Reason is the correct explanation for Statement.

Q.

Name the most common ore of the metal Aluminum from which the metal is extracted. Write the chemical formula of the ore.

Q. Give equations for the following conversions:
(i) Ferric oxide to iron
(ii) Aluminium hydroxide to aluminium oxide
(iii) Aluminium to aluminium nitride
(iv) Aluminium to sodium aluminate

Q. What is ore ?give any two ore of Fe, Zn and Al

Q.

Ores mined from the earth are usually contaminated with large amounts of impurities known as _______.

1. gangue
2. alloys

3. flux

4. minerals

Q.

Are humans made of stardust?

Q.

Which of the following metals are available in free or native state?

1. Gold

2. Silver

3. Copper

4. Platinum

Q. What is the anode and cathode used in Hall-Heroult process?

1. 
   Zinc and copper
2. 
   Iron and copper
3. 
   Carbon and zinc
4. 
   Graphite and carbon

Q. ____ are elements and compounds that occur naturally in the Earth's crust.

1. Ore
2. Minerals
3. Gangue
4. Slag

Q. The ore of zinc containing its sulphide is:

Q.

The ___ reactive metals occur in nature in the free form.

Q. What is the chemical formula of the following ores? Also write the name of the metal that can be extracted from the following ores?

(a) Bauxite
(b) Haematite
(c) Copper pyrite
[3 Marks]

Q. Is anodizing only applicable on aluminium or also on copper?

Q.

Which of the following is not an ore of Iron?

1. Haematite

2. Magnetite

3. Cryolite

4. Limonite

Q.

Name the following:

The ore of zinc, containing its sulfide.

Q.

The most abundant metal in the earth's crust is___.

1. Al

2. Fe

3. O

4. Cu

Q. ____ are elements and compounds that occur naturally in the Earth's crust.

1. Minerals
2. Gangue
3. Ore
4. Slag

Q. Sodium is highly reactive and can cause fire and explosion with water. Therefore, on a commercial scale, it is prepared as:

1. an oxide
2. a tin-plated metal
3. an alloy of lead
4. an amalgam of mercury

Q.

write the chemical equation of the following :

1. aluminium and hydrogen

2. a non metal ( except sodium) and chlorine.

3. a non metal ( except hydrogen ) and oxygen .

Q.

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

1. Carbonates

2. Sulphates

3. Nitrates

4. Sulphides

Q.

All ores are minerals whereas all minerals are not ores.

1. True

2. False