Question : 'Plaster of Paris' is made by partial dehydration of

Option 1: epsom salt

Option 2: gypsum salt

Option 3: blue vittriol

Option 4: green vitriol

Question : The purest form of water is

Option 1: Tap water

Option 2: Rain water

Option 3: Ground water

Option 4: Distilled water

Question : The advantge of detergents over soaps is :

Option 1: Detergents are soluble in water

Option 2: Detergents could not give much lather

Option 3: Dtergents give lather even with  hard water

Option 4: Soapes give lather with only soft water

Question : In a mixture of 25 litres, the ratio of milk to water is 4 : 1. Another 3 litres of water is added to the mixture. The ratio of milk to water in the new mixture is:

Option 1: 5 : 1

Option 2: 5 : 2

Option 3: 5 : 3

Option 4: 5 : 4

Question : PVC is obtained by the polymerisation of 

Option 1: Propane

Option 2: Vinyl chloride

Option 3: Styrene

Option 4: Acetylene