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Chemistry

Chemistry
Non-stick kitchenwares are coated with

Silicon
Graphite
PVC
Teflon

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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

B
A
C
D

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Chemistry
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

d-electrons in Fe(Z = 26)
p-electrons in CI(Z = 17)
p-electrons in Ne(Z = 10)
s-electrons in Mg(Z = 12)

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Chemistry
The compound that has the least value for octane number is :

Iso-octane
2-methyl heptane
2,2-dimethyl hexane
N-heptane

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Chemistry
The third shell of an atom can have a maximum of ______ electrons

15
18
21
13

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Chemistry
Which of the following is not a precious/semi-precious stone?

Sapphire
Ruby
Pearl
Emerald

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