Question

The students of class X went to the Chemistry Laboratory of nearby school. They saw different chemical used in the laboratory. They were very much interested to know the uses of different chemicals. They have collected the following chemicals. NaHCO3 , Na2 CO3 , CaOCl2 , CaSO4 . ½H2 O, HCl, NaOH (i) Name the reaction when HCl and NaOH combined. (ii) What is the use of Na2 CO3 ? (iii) Which one is strong acid and strong base? (iv) What is the use of NaHCO3 ? (v) What is the use of CaSO4 . ½ H2 O? (vi) What is the use of CaOCl2 ? Ses

Answer 1

It is a neutralisation reaction.
HCl is a strong acid and NaOH is a strong base

Answer 2

The students of class X went to the Chemistry Laboratory of nearby school. They saw different chemical used in the laboratory. They were very much interested to know the uses of different chemicals. They have collected the following chemicals. NaHCO3 , Na2 CO3 , CaOCl2 , CaSO4 . ½H2 O, HCl, NaOH

(i)The reaction when HCl and NaOH combined is neutalisation reaction. (ii) Na2 CO3 is used in water softener.

(iii)HCl is strong acid and NaOH is strong base.

(iv)NaHCO3 is used for antacid.

(v)CaSO4 . ½ H2 O is used in making sculpture.

(vi) CaOCl2 is used as germicide in the sterilization of drinking water.