Q. Until the nineteenth Century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The inventor was
1) Goldschmidt
2) Mond
3) Charles-Martin Hall
4) Parkes
Q. The two elements that exist as liquids at 25°C are
1) mercury and lithium
2) mercury and Caesium
3) bromine and mercury
4) mercury and argon
Q. The term 'Carat' is used to express the purity of gold. The purest form of gold is
1) 18 carats
2) 20 carats
3) 22 carats
4) 24 carats
Q. The sulphide ores of metals are concentrated by
1) cupellation
2) electrolysis
3) froth floatation
4) calcinations
Q. The substance that is least prone to catch and spread fire is
1) Nylon
2) Terycot
3) Cotton
4) Polyester
Q. The substance that contains the maximum amount of nitrogen is
1) Urea
2) Ammonium Sulphate
3) Ammonium Nitrate
4) Ammonium Chloride
Q. The purest form of iron is
1) pig iron
2) cast iron
3) wrought iron
4) stainless steel
Q. The nucleus of a hydrogen atom consists of
1) One Proton + One Neutron
2) One Protons + Two Neurons
3) One Neutron Only
4) One Electron Only
Q. The nuclear particles that are assumed to hold nucleons together are
1) Electrons
2) Positrons
3) Neutrons
4) Mesons
Q. The National Chemical Laboratory is situated in
1) New Delhi
2) Bangalore
3) Pune
4) Patna
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