Answer:
(a) (i) Baking powder has tasty
tartaric acid which reacts withproduced
during decomposition of and
neutralizes it, so if tartaric acid is not present, the cake will taste bitter
due to the presence of sodium carbonate
(ii) By adding tartaric acid to
baking soda we can form baking powder. (1)
(iii) Tartaric acid neutralizes
the sodium carbonate formed during decomposition of hence, it
makes the cake tasty and not bitter intaste. (1)
(b) The acid is formic acid
(HCOOH). If baking soda (abase) is applied on the sting (biting area), it
givesrelief.
(1 x 2)
Or
(a) X is calcium carbonate.
(1)
Solution Y is lime water
(1/2)
During electrolysis of brine, gas is released
at anode. So, gas G is Cig gas (chlorine gas). (1/2)
(1/2)
Hence, Z is calcium oxychloride
(bleaching powder). (1/2)
(ii) Egg shells are made up of
calcium carbonate. (1)
So, brisk effervescence due to
the liberation of CO2 gas is observed. There action is
(1)
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