Write scientific reasons. [5 marks]
a. Graphite is a conductor of electricity.
b. Graphite is not used in ornaments.
c. Limewater turns milky when carbon dioxide is passed through it.
d. Biogas is an eco-friendly fuel.

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Solution

a. Graphite contains free electrons between its layers and they move continuously within the entire layer. Due to this, graphite conducts electricity. [1 mark]

b. Graphite is soft, brittle and slippery due to which it is not used in ornaments. [1 mark]

c. When carbon dioxide gas is passed through limewater, it turns milky due to the formation of calcium carbonate. [1 marks]

The balanced equation is:

$Ca {(OH)}_{2} + {CO}_{2} \to {CaCO}_{3} + H_{2} O$ [1 mark]

d. Biogas helps to reduce the greenhouse gas emissions and our dependency on fossil fuels. Thus, it is an eco-friendly fuel. [1 mark]

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(a) ………… is a good conductor of heat and electricity.

(b) Fullerene is an ………… of carbon.

(d) Charcoal is an ………… of carbon.

(e) Diamond is a ………… conductor of electricity.

(d) A biogas plant produces ………… gas.

Write scientific reasons

a) Graphite is a conductor of electricity.

b) Graphite is not used in ornaments.

c) Limewater turns milky when CO2 is passed through it.

d) Biogas is an eco-friendly fuel.

When carbon dioxide is passed through limewater, it turns milky due to the formation of ____________.

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