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
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
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
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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