Uses of metals and nonmetals

Q.

The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called

1. Decantation

2. Calcination

3. Roasting

4. Boiling

Q. Why are alloys considered mixture?

Q.

Why the Iron pillar in Delhi do not get rusted?

Q.

Name two metals which are used for making cooking utensils and water boilers for factories.

Q.

When iron is mixed with carbon, nickel and chromium in an appropriate quantity, which of the following alloy is formed?

1. Brass
2. Anodised iron
3. Stainless steel
4. Aluminium oxide

Q.

Which metal has been used to make the wires shown in the picture?

1. Al

2. Fe

3. C

4. Cu

Q. The property by which materials can be drawn into wires is called _____

1. None of the above
2. Lustre
3. Ductility
4. Malleability

Q. Carbon and iron form an alloy called steel. What is the function of carbon in this alloy?

1. Increase the melting point
2. Increase the strength
3. Increase the ductility
4. Make the alloy corrosion resistant

Q. Steel is made from a combination of

1. Iron and Zinc
2. Iron and Nickel
3. Iron and Cobalt
4. Iron and Carbon

Q.

Corrosion of iron can be prevented by :-

1. Coating of Zinc

2. Aluminium Paint

3. Both Aluminium and Zinc

4. Copper Paint

Q. Metals generally do not react with which of the following acid?

1. Sulphuric acid
2. Nitric acid
3. Hydrochloric acid
4. Carbonic acid

Q. Why don't other metals have the ability to form a protective layer on them after corrosion, like aluminium and copper?

Q.

Write the properties of the following:

Neutral oxides

Q.

The main use of Iron is in the construction industry.

1. True

2. False

Q.

Calcination is defined as:

1. Heating of sulphide ores in absence of air

2. Heating of carbonate ores in presence of air

3. Heating of carbonate ores in absence of air

4. Heating of sulphide ores in presence of air

Q.

How are metals extracted?

Q. What is the difference between roasting and calcination?

Q.

____ occurs in iron by the influence of water vapour and oxygen present in the air.

1. Galvanisation

2. None of these

3. Combustion

4. Rusting

Q.

What is the use of Zinc oxide?

Q. Explain why we don't store lemon pickle in an aluminum utensil.

Q. What is roasting ?

Q. When Iron is mixed with Carbon, Nickel and Chromium, the alloy formed is ___

Q.

Calcination is defined as:

1. Heating of sulphide ores in presence of air

2. Heating of sulphide ores in absence of air

3. Heating of carbonate ores in presence of air

4. Heating of carbonate ores in absence of air

Q.

Which among the following non-metal combines with sodium to form common salt?

1. Carbon

2. Chlorine

3. Iodine

4. Bromine

Q.

Which metal has been used to make the wires shown in the picture?

1. Al

2. Fe

3. C

4. Cu

Q. Iron articles are shiny when new, but get coated with a reddish brown layer when left in open for a long time.

1. True
2. False

Q.

Coating and painting can be done to prevent rusting.

1. Copper

2. Aluminium

Q.

The process of calcination is used for

1. Carbonate ores

2. Sulphide ores

3. Nitrate ores

4. Sulphate ores

Q. The hydrogen phosphate of certain metal has formula MHPO4.The formula of metal chloride would be 1)MCL 2)MCL2 3)M2CL2 4)MCL3

Q.

Complete the following reaction.

1. 3Al; H₂O

2. Al₂O₃; 3H₂

3. 2AlO; H₂

4. Al₂H₂; 3O₂