Chapter 2: Materials: Metals and Non-metals

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Q
Materials: Metals and Non-metals

Question:

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 word equations of all the reactions taking place in this process.

Answer:

(a) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. She can find the nature of the gas by using most litmus paper. When a moist litmus paper comes in contact with an acidic gas, it turns red. Similarly, it turns blue when moist litmus paper comes in contact with a basic solution.

(b) Carbon (charcoal) is a non-metal. So, it burns in presence of oxygen gas to form carbon dioxide gas.

{color{Blue} mathbf{Carbon+Oxygen
ightarrow Carbon dioxide}}

When we pass the carbon dioxide gas to moist litmus paper, carbon dioxide gas reacts with the water present on the litmus to form carbon acid that turns the litmus paper red.

{color{Blue} mathbf{Carbon dioxide+Water
ightarrow Carbonic acid}}


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