(b) Aluminium
     (c) Iron
     (d) Lithium
Ans: (a)
245. Which one of the following is correct? Butter is:
     (a) a super cooled oil
     (b) an emulsion
     (c) a molecular solid
     (d) None of the above
Ans: (b)
246. Which one of the following is an element? [CDS 2008]
     (a) Topaz
     (b) Diamond
     (c) Ruby
     (d) Sapphire
Ans: (b)
247. Among the following elements, which one is not present in a pure sugar? [Asstt Comm 2008]
     (a) Carbon
     (b) Hydrogen
     (c) Nitrogen
     (d) Oxygen
Ans: (c)
248. Consider the following statements:
     1) Baking soda is used in fire extinguishers.
     2) Quick lime is used in the manufacture ofglass.
     Which of the statements "given above is/are correct ? [Asstt Comm 2008]
     (a) 1only
     (b) 2 only
     (c) Both 1and 2
     (d) Neither 1 nor 2
Ans: (c)
249. Which one of the following is used in preparing match sticks? [Asstt Comm 2008]
     (a) Chile saltpetre
     (b) Indian saltpetre
     (c) Red phosphorus
     (d) Sodium bicarbonate
Ans: (c)
250. Which one of the following metals is found in "plaster of paris" ? [Asstt Comm 2008]
     (a) Calcium
     (b) Magnesium
     (c) Potassium
     (d) Sodium
Ans: (a)