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Sunday 10 January 2016

General Science Chemistry- 12

191. Butane is used in-
cigarette lights.

192. A mixture of oxygen and acetylene gases are used for-
 gas welding.

193. Methane is the main component of-
 biogas.

194. The smell of cooking gas is due to the Ethyl Mercaptan which helps to-
 detect gas leakage.

195. Alnico is an alloy of aluminium used for-
 making magnets.

196. Duralmin is an alloy of aluminium (94%), copper (4%) and Magnesium (1%) used for –
constructing air crafts.

197. Invar is a nickel -iron alloy used for-
 making clocks.

198. Aspirin or Acetyl salicylic acid is used as a –
pain killer and it has anti-inflammatory properties.

199. Tri Nitro Toluene (TNT) is used as an-
 explosive.

200. The most commonly used Synthetic rubber is-
 styrene Buta-diene rubber (SBR).

201. The electrodes of dry cell is made up of-
 Graphite.

202. Acid rain is caused by the pollution of environment due to-
 nitrogen oxide and sulphur dioxide.

203. The most chemically active element is-
 Fluorine.

204. Chlorofluro carbon (CFCS) used in refrigerators causes-
 ozone hole formation.

205. Sodium/Potassium salt of stearic acid, palmitic acid and oleic acid is-
 soap.

206. Aquaregia is a mixture of concentrated nitric acid and hydrochloric acid which can dissolve-
 gold and platinum.

207. Coins are made of coinage alloy which consists of-
 copper and nickel.

208. Coloured glasses for goggles contain-
 ferrous oxide.

209. Coating of iron with zinc to prevent from rusting, is called-
 galvanisation.

210.Lead is used in petrol as an –
antiknocking agent.
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