Ans: (a)
207. Consider the following statements:
     1) Anhydrous sodium carbonate is commonly known as baking soda.
     2) Baking soda is used in fire extinguishers.
     3) Bleaching powder is manufactured in Hasenclever plant.
     Which of the statements given above is/are correct? [IAS 2005]
     (a)  1, 2 and 3
     (b)  2 and 3
     (c)  3 only
     (d)  1 and 2
Ans: (a)
208. Consider the following statements:
     1) Marble is a constituent of tooth paste.
     2) Gypsum is used for the manufacture of ammonium sulphate.
     Which of the statements given above is/are correct? [CDS 2005]
     (a)  1 only
     (b)  2 only
     (c)  Both 1 and 2
     (d)  Neither 1 nor 2
Ans: (c)
209. Consider the following statements:
     1) Glycerol is used in explosives.
     2) Detergents are made from hydrocarbons obtained from coal or petroleum.
     3) Sodium perborate is a mild bleaching agent.
     4) Methanol is used for making synthetic fibres.
     Which of the statements given above are correct? [CDS 2005]
     (a)  1, 2, 3 and 4
     (b)  1.2 and 3
     (c)  2. 3 and 4
     (d)  1 and 4
Ans: (b)
210. Nail polish remover contains: [CDS 2009]
     (a) acetone
     (b) benzene
     (c) petroleum ether
     (d) acetic acid
Ans: (a)
211. Aqua regia used by alchemists to separate silver and gold is a mixture of: [CDS 2009]
     (a) hydrochloric acid (concentrated) and nitric acid (concentrated)
     (b) hydrochloric acid (concentrated) and sulphuric acid (concentrated)
     (c) nitric acid (concentrated) and sulphuric acid (concentrated)
     (d) hydrochloric acid (dilute) and sulphuric acid (dilute)
Ans: (a)
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