Give reasons for
a) Rain water conducts electricity but distilled water does not.
b) We feel burning sensation in stomach when we over eat.
c) A tarnished copper vessel regains its shine when rubbed with lemon.
d) Washing soda becomes white powder when exposed to air.
e) Aqueous solution of NaCl is neutral but aqueous solution of Na2Co3is basic.
Answers
Answer:
a. Distilled water is pure form of water which do not contain any solute in it. Therefore it cannot conduct electricity because it does not contain ions while rain water contains dissolved salts and acids which dissociates in ions and conducts electricity.
B. When we overeat excess of acid is produced in the stomach which causes burning sensation
C. On rubbing a tarnished copper vessel with lemon, it begins to shine again. ... Lemon is acidic. Thus, on rubbing the tarnished copper vessel with lemon, the basic copper oxide or copper carbonate reacts with the acid (citric acid) present in the lemon to form a salt which is washed away with wate
D. Washing soda is sodium carbonate decahydrate. which when exposed to air loses 10 molecules of water and changes to white powder.