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Chemistry

Chemistry
The percentage of oxygen in air is approximately

0.01
0.21
1
0.78

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Chemistry
The main active constituent of tea and coffee is

caffeine
chlorophyll
nicotine
aspirin

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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
D
C
B

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Chemistry
The wire of flash bulb is made of:

Silver
Barium
Copper
Magnesium

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Chemistry
When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is

Carbon dioxide
Hydrogen
Oxygen
All of them

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Chemistry
Major portion of the earth’s crust is mainly constituted by

Silicon and Aluminium
Oxygen and Silicon
Silicon and Iron
Oxygen and Iron

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