Question - 2 : -
Which of the following statements is correct?
(a) All metals are ductile.
(b) All non-metals are ductile.
(c) Generally, metals are ductile.
(d) Some non-metals are ductile.

Answer - 2 : -

Question - 3 : -
Fill in the blanks.
(a) Phosphorus is a very ____ non-metal.
(b) Metals are _____ conductors of heat and _____
(c) Iron is ______ reactive than copper.
(d) Metals react with acids to produce ______ gas.

Answer - 3 : -

(a) reactive

(b) good, electricity

(d) hydrogen

Question - 4 : -
Mark ‘T’ if the statement is true and ‘F’ if it is false.
(a) Generally, non-metals react with acids.
(b) Sodium is a very reactive metal.
(c) Copper displaces zinc from zinc sulphate solution.
(d) Coal can be drawn into wires.

Answer - 4 : -

(a) False

(b) True

(d) False

Question - 5 : -
Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties.

Properties

Metals

Non-metals

Appearance

Hardness

Malleability

Ductility

Heat Conduction

Conduction of Electricity

Answer - 5 : -

Properties	Metals	Non-metals
1. Appearance	have metallic lustre	dull
2. Hardness	hard	soft
3. Malleability	malleable	non-malleable
4. Ductility	ductile	non-ductile
5. Heat Conduction	good conductors	bad conductors
6. Conduction of Electricity	good conductors	bad conductors/insulators

Question - 6 : -
Give reasons for the following.
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene.

Answer - 6 : -

(a) Aluminium is highly malleable and it can be easily beaten in sheets to make its foil for wrapping purposes. It is also soft and does not react with food items. That is why aluminium foils are used . to wrap food items.

(b) Immersion rods made up of metallic substances because metals are good conductors of heat and electricity. They get hot very soon on the passage of electric current and warm the water.

(d) Sodium and potassium are highly reactive, so they are stored in kerosene.

Question - 7 : -
Can you store the lemon pickle in an aluminium utensil? Explain.

Answer - 7 : -

No, we cannot store lemon pickle in an aluminium utensil because aluminium is a metal and metals readily react with acids to produce hydrogen. When aluminium comes in contact with lemon, which is acidic, would react to give hydrogen and the pickles will be spoiled.

Question - 8 : -
Match the substances given in column A with their uses given in column B.

A

B

Gold

Thermometers

Iron

Electric wire

Aluminium

Wrapping food

Carbon

Jewellery

Copper

Machinery

Mercury

Fuel

Answer - 8 : -

(i) (d)

(ii) (e)

(iii) (c)

(iv) (f)

(v) (b)

(vi) (a)

Question - 9 : -
What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in a copper sulphate solution?
Write word equations of the reactions involved.

Answer - 9 : -

(a) No reaction will take place because copper is very less reactive.

(b) Iron being more reactive than copper will replace copper from its solution and brown coating of copper is deposited on the iron nails. Also, the blue colour turns green.

Iron + Copper sulphate (solution) → Iron sulphate (solution) + Copper

Question - 10 : -
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down the word equations of all the reactions taking place in this process.

Answer - 10 : -

(a) She can find the nature of the gas by using a wet litmus paper. After bringing the litmus paper in contact with the gas, if it turns the blue litmus paper into red, it is acidic. Similarly, if it turn the red litmus into blue, it is basic.

(b) (i) Carbon + Oxygen → Carbon dioxide

(ii) Carbon dioxide + Lime water → Milky

Free - Previous Years Question Papers

A	B
Gold	Thermometers
Iron	Electric wire
Aluminium	Wrapping food
Carbon	Jewellery
Copper	Machinery
Mercury	Fuel

Chapter 4 Materials Metals and Non Metals Solutions

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