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Chemistry CBSE Live product
Class 10 (2026-27)
Acids, bases and salts
Chemicals from common salt
7.
Applications of chemicals from common salts
Question:
4
m.
Answer the following questions given below:
Varsha heats baking soda in a test tube and passes the gas evolved through limewater. The limewater turns milky.
1.
Identify the gas evolved.
Sulphur dioxide
Oxygen
Hydrogen
Carbon dioxide
2.
Write the chemical reaction.
\(NaHCO_3 → Na + H_2O + CO_2\)
\(2NaHCO_3 → Na_2CO_3 + H_2O + SO_2\)
\(2Na_2CO_3 → NaHCO_3 + H_2O + CO_2\)
\(2NaHCO_3 → Na_2CO_3 + H_2O + CO_2\)
3.
Why does limewater turn milky?
Formation of calcium carbonate
Formation of sodium choride
Formation of carbon dioxide
Formation of sodium carbonate
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