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 to-
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
pottassium hydrogen tartarate.
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
226. Gun
metal is made from-
tin and copper.
227. Cobalt
is used in making-
rust - resistant alloys.
228. Steel is
a form of iron. To make steel from iron, The carbon content is reduced from-
5% to 0.5 -1.5%)
229. Platinum
metal occurs in its pure form in-
earth's crust
230. The
first known super conductor is –
mercury.
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65. Silver
is the best conductor of –
heat and
electricity.
66. Iodine
is a-
solid non-metal
67. Iron is
the-
first metal used by man
68. Metallic
cofactor present in chlorophyll is-
magnesium.
69. Metallic
cofactor present in haemoglobin is-
iron.
70. Metal
abundant in sea water is-
Vanadium
71. The
metal most abundant in human body is-
calcium.
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