Question
Copy and complete the following table:
Column $1$ Column $2$ Column $3$
Substance reacted with acid Dilute or concentrated acid Gas
    Hydrogen
    Carbon dioxide
    Only chlorine

Answer

Column $1$ Column $2$ Column $3$
Substance reacted
with acid
Dilute or concentrated
acid
Gas
Zinc Dilute sulphuric acid Hydrogen
Calcium carbonate Concentrated sulphuric acid Carbon dioxide
Bleaching power
$CaOCl_2$
Dilute sulphuric acid only chlorine

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