Chemistry- Questions and Answers 07
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. Duralumin 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 Acetylsalicylic 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 are made up of-
Graphite.
202. Acid rain is caused by the pollution of the 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. Aqua Regia 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 rusting is called-
galvanisation.
210. Lead is used in petrol as an –
antiknocking agent.
211. Natural gas predominantly contain ---
methane.
212. Liquified Petroleum Gas mainly consists of-
liquified butane and isobutane.
213. Ethylene is used for the artificial ripening of-
green fruit.
214. Gelatine is used in the manufacture of ice cream too -
prevent crystal growth.
215. Vulcanisation is the process of adding sulphur to rubber to make it-
strong and bounceable
216. Non-stick kitchenware is coated with-
Teflon (Poly tetra Fluro Ethylene) and potassium hydrogen tartrate.
217. Stainless Steel is an alloy of –
iron (73%), Carbon(1%), Chromium (18%) and Nickel (8%)
218. Solder is an Alloy of-
lead (50%) and tin (50%)
219. Bronze is an alloy –
of copper and tin.
220. Brass is an alloy of-
copper (60-80%) and Zinc (40-20%)
221. Mercury and gallium are metals which are liquids at-
room temperature.
222. The hardest metal is –
Tungsten.
223. Wrought iron is the purest type of iron that contains-
least amount of carbon.
224. Silver, gold and platinum are known as –
noble metals.
225. Metals which has the highest density is-
Osmium
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