(i) Sodium bicarbonate/Sodium hydrogencarbonate/ baking soda and its formula is NaHCO3
heat
(ii) 2NaHCO3 Na2CO3 + CO2 + H2O
(iii) It is used in fire extinguisher and for baking. (any one)
OR
(i) Add 10 mL of concentrated sulphuric acid slowly to 90 mL of water with constant stirring.
Dilution of acid is a highly exothermic process. If water is added to concentrated sulphuric acid, heat
generated causes the mixture to splash leading to burns and the glass container can break.
(ii) Decreases per unit volume.
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where is the question because you have written a whole paragraph
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