Answer:
(a)
When baking powder is added to the mixture during cake preparation, the baking
soda present in it, produces gas on heating,
which makes the cake soft and spongy.
(b)
The gas produced by
the reaction of baking soda and acid in the soda-acid fire extinguisher, helps
in extinguishing fire. (1)
(c) pH value of baking soda solution is higher than 7, i.e.,
it is alkaline. (1)
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