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Chemistry

Chemistry
An electric iron has a heating element made of :

Nichrome
Copper
Zinc
Tungsten

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Chemistry
The hardest form of carbon is

coke
diamond
graphite
charcoal

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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

A
C
B
D

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Chemistry
The electronic configuration of an atom having atomic number ‘20’ is

2, 8, 10
2, 8, 8, 2
2, 6, 8, 4
2, 10, 8

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Chemistry
The most suitable unit for expressing nuclear radius is :

Micron
Angstrom
Fermi
Nanometre

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Chemistry
Copper substances when exposed to air gains a green coating due to the formation of:

CuO
CuSO4
Cu(NO3)2
CuCO3 Cu(OH)2

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