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231.

Aluminium is more reactive than iron but aluminium is less easily corroded than iron, because
(a)Oxygen forms a protective oxide layer
(b)It is noble metal
(c)Iron undergoes reaction easily with water
(d)Iron forms ions
Comment
Answer is: DNA

232.

Which one if the following metal is extracted through alloy formation?
(a)Manganese
(b)Silver
(c)Nickel
(d)Lead
Comment
Answer is: BNA

233.

Blister copper is about
(a)60% Cu
(b)90% Cu
(c)98% Cu
(d)100% Cu
Comment
Answer is: CNA

234.

Refining of silver is done by
(a)Liquation
(b)Poling
(c)Cupellation
(d)Van Arkel method
Comment
Answer is: CNA

235.

Flux is used to removed
(a)Basic impurities
(b)Acidic impurities
(c)All type of impurities
(d)Acidic and basic both impurities
Comment
Answer is: DNA

236.

Black tin is
(a)An alloy of Sn
(b)An allotrope of Sn
(c)60-70% SnO2
(d)100% SnO2
Comment
Answer is: CNA

237.

Lead pencils contains
(a)Graphite
(b)Softened lead
(c)Galena
(d)Anglesite
Comment
Answer is: ANA

238.

Which ore contains both iron and copper?
(a)Cuprite
(b)Chalcocite
(c)Chalcopyrite
(d)Malachite
Comment
Answer is: CNA

239.

The hardest naturally occurring substance is
(a)Iron
(b)Graphite
(c)Diamond
(d)Astatine
Comment
Answer is: CNA

240.

By annealing, steel
(a)Become soft
(b)Become liquid
(c)Become hard and brittle
(d)Is covered with a thin film of Fe3O4
Comment
Answer is: ANA

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