Q13 of 53 Page 60

Write the name and chemical formula of the calcium compound used for disinfecting drinking water. How is this compound manufactured?

i. The name and chemical formula of the calcium compound used for disinfecting drinking water is:-


Chemical name - Calcium oxychloride


Formula - CaOCl2


ii. This compound is manufactured by the action of chlorine on dry slaked lime as per the following reaction:


Ca(OH)2 + Cl2→ CaOCl2 + H2O


More from this chapter

All 53 →
11

Crystals of CuSO4 are heated in a test tube for some time.

(a) What is the colour of CuSO4 crystals:


(i) before heating, and


(ii)after heating?


(b) What is the source of liquid droplets seen on the inner upper side of the test tube during the heating process?

 12

(i) Name the products formed when NaHCO3 is heated.

(ii) Write the chemical equation for the reaction involved in the above.

 14

Show the decomposition of gypsum to P.O.P. and back interconversion of P.O.P. of gypsum.

 15

What happens when:

(a) CO2 is passed through lime water in a limited quantity?


(b) CO2 is passed through lime water in excess?