CBSE Class 8 Science Materials Metals And Non Metals Assignment Set E

CBSE Class 8 Science - Materials Metals And Non-Metals (5)

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Q1. How are elements classified ?

Q2. What are metalloids ? Give 2 examples.

Q3 a. Define the terms: Malleability and Ductility

b. Name the two most malleable metals.

Q4. State the difference between metals and non metals on the basis of the following

criteria –

a. Lustre b. Thermal & electrical conductivity

c. Physical state d. Ductility

Q5. Answer in one word:

a. A liquid metal

b. A liquid non metal

c. A soft metal

d. A lustrous non metal

e. A hardest naturally occurring non metal

f. A non-metal which conducts electrically

g. A metal having low melting point

Q6. State the differences between:-

Metals and non –metals in their reaction with Oxygen. Give 2 examples of the kind

of oxides formed by them.

Q7. Explain the phenomena of rusting with the help of a word equation ?

Q8. Give reasons:-

a. When Iron is mixed with Copper Sulphate Solution, the colour of the solution

changes.

b. Metals like Sodium & Potassium are stored in Kerosene oil while non-metals like

Phosphorous is stored in water.

c. Copper is used for making electrical wires.

d. Copper loses its Lustre and develops a green coating over it when exposed to

atmosphere.

Q9. An unknown element X reacts in air to form its oxide Y. This Y dissolves in water

which turns blue litmus into red. Predict whether X is a metal or a non-metal ?

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