191. Butane is used in-
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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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