31.  Mortar is a mixture of water, sand -

Answer & Explanation
Slaked Lime

32.  Chile saltpeter is the common name of-

Answer & Explanation
Sodium                         Nitrate (NaNo3)

33.  Chemical formula of washing soda is-

Answer & Explanation
Na2Co3 10H2O

34.  Commercial name of sodium bicarbonate is -

Answer & Explanation
Baking Soda

35.  Chemical name of baking soda is-

Answer & Explanation
Sodium Bicarbonate

36.  Sodium chloride or Table salt occours in nature as the mineral

Answer & Explanation
Halite

37.  Most commonly bleaching agent is -

Answer & Explanation
Chlorine

38.  Sodium carbonate commonly known as-

Answer & Explanation
Washing soda

39.  Chemically 'Philosopher wood' is a-

Answer & Explanation
Zinc oxide (zno)

40.  Why Helium gas used in balloons?

Answer & Explanation
Its Lighter than air

41.  Chemical Name of common salt is-

Answer & Explanation
Sodium chloride

42.  Helium gas is filled in the balloon instead of Hydrogen because its-

Answer & Explanation
Non-Combustible

43.  What is asbestos?

Answer & Explanation
Magnesium silicate

44.  pH-scale ranges from -

Answer & Explanation
0-14

45.  Conversion of Heat into electric energy is achieved by using -

Answer & Explanation
Thermocouple
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