Occurrence of Metals

Q.

Which of the following is the chief ore of copper?

1. Chalcopyrite

2. Cuprite

3. Ruby copper

4. Copper glance

Q.

Cinnabar is an ore of ____.

1. mercury
2. copper
3. calcium
4. lead

Q.

Which ore contains both Iron and copper?

1. Cuprite

2. Malachite

3. Chalcocite

4. Chalcopyrite

Q. Define and explain the meaning of the term ore.

Q.

Carnallite is the mineral of

1. Na

2. Mg

3. C

4. Ca

Q. The minerals from which the metals are extracted are called ___.

Q.

Which of the following is a sulphide ore of copper?

1. Azurite

2. Copper glance

3. Cuprite

4. Malachite

Q.

(a) What is the difference between a mineral and an ore?
(b) Which metal is extracted from cinnabar ore?
(c) Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
(d) How is sodium metal extracted? Explain with the help of the equation of the reaction involved.
(e) Name three other metal s which are extracted in a manner similar to sodium.

Q.

The metal which can be extracted from pyrolusite ore is:
(a) mercury (b) manganese (c) calcination (d) sulphonation

Q. Name the most abundant metal and non-metal in the earth's crust.

Q.

Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg (b) Ag and Zn (c) Au and Hg (d) Au and Ag

Q.

Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper (b) mercury (c) aluminium (d) zinc

Q.

Which of the following metals can be obtained from haematite ore?
(a) copper (b) sodium (c) zinc (d) iron

Q.

Azurite is an ore of -

1. Silver

2. Iron

3. Copper

4. Gold

Q.

Magnalium is an alloy of aluminium.

1. True

2. False

Q.

Is zincite is a carbonate ore?

Q.

Which of the following alloy is used in the construction of aircraft and scientific instruments?

1. Stainless steel

2. Brass

3. Bronze

4. Magnalium

Q. The elements or compounds of the metals which occur in nature in the earth crust are called ___.

Q.

Which hydride is commercially known as hydrolith ?

1. MgH₂

2. CaH₂

3. NaH

4. KH

Q.

(a) Name two metals which are found in nature mainly in the free state (as metallic elements).
(b) Name two metals which are always found in the combined state.
(c) What iron compound is present in haematite ore? Also, write its chemical formula.

Q.

In nature, metal A is found in a free state while metal B is found in the form of its compounds, Which of these two will be nearer to the top of the activity series of metals?

Q.

What are the two different alloys of aluminum?

Q.

Give one word for the following.

A metal which burns with a non-persistent green flame in air or oxygen.

Q.

Which of the following statement is correct?

1. All ores are minerals

2. All minerals are ores

3. Some ores are minerals

4. Ores are not minerals

Q. Comment on the statement that-"All ores are minerals but all minerals are not ores".

Q. Question 1 (i)

Define the term mineral.

Q.

(a) Name the most abundant metal in the earth's crust
(b) Name the most abundant non-metal in hte earth's crust.

Q.

If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?

Q.

Reactive metals do not occur in nature in free state.

1. True

2. False

Q.

All minerals are not ores. True or False?

1. Yellow

2. Red