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Chemistry

Chemistry
Hardest allotrope of carbon is

Diamond
Lamp black
Coke
Graphite

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Chemistry
Match the List-I with List-II and select the correct answer using the codes given belowList-I (Vitamin)List-II(Chemical compound)F.Vitamin A1.ThiaminG.Vitamin B12.RetinolH.Vitamin C3.Ascorbic acidJ.Vitamin E4.TocopherolCodes :FGHJA.4132B.2314C.4312D.2134

C
D
A
B

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Chemistry
The important metal used with iron to produce stainless steel is

Aluminium
Carbon
Chromium
Tin

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Chemistry
The polymer used in making plastic crockery is

Decron
Nylon
Bakelite
Melamine

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Chemistry
Aquaregia is a mixture of the following in the ratio 1 : 3 by volume

Dil. HCl and dil. HNO3
Conc. HCl and conc. HNO3
Conc. HNO3 and conc. H2SO4
Conc. HNO3 and conc. HCl

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Chemistry
The most important ore of aluminium is

monazite
haematite
bauxite
magnetite

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