The reason for chlorinating water is _____.

1. 1. to kill germs
   2. to add minerals
   3. to add taste
   4. to propagate germs

Which among the following is in liquid state at normal room temperature?

1. 1. Phosphorus
   2. Sodium
   3. Mercury
   4. None of the above

Atomic weight of uranium is _____.

1. 1. 238 u
   2. 237 u
   3. 226 u
   4. 245 u

Enzymes are _____.

1. 1. Chemical catalyst
   2. Organic catalyst
   3. Biological catalyst
   4. Inorganic catalyst

In colourful diamond, different colours are present due to _____.

1. 1. Impurities
   2. Different patterns of carbon chains
   3. Angular bonds between the carbon atoms
   4. None of the above

In Pakistan and other countries which of the following methods is used in manufacture of sulphuric acid?

1. 1. Frasch method
   2. Contact process
   3. Haber’s process
   4. Ostwald’s method

Ammonia was obtained from urine by _____.

1. 1. Al-Beruni
   2. Jabir bin Hayan
   3. Aljahiz
   4. Wohler

Detergents are better than soaps because _____.

1. 1. They wash clothes better
   2. Absorb the hardness of water
   3. They are less soapy
   4. They are less affected by hard water

Chemically, soap is _____.

1. 1. Salt
   2. Base
   3. Acid
   4. Hydrocarbon

Lipids are _____.

1. 1. Long chain sulphonic acid esters
   2. Long chain fatty acid esters
   3. Polymeric hydrocarbons
   4. Polymeric aldehydes