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Chemistry

Chemistry
Which of the following is used to remove rust stains on cloth?

Kerosene
Lime
Oxalic acid solution
Petrol

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Chemistry
If the equilibrium constants for the systems H2 + I2 ? 2HI and 2HI ? H2 + I2 are K1 and K2 respectively, the relationship between K1 and K2 is :

K1 = 2K2
K1 = K2
K 1 = 1 /K2
K1 = K2/2

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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 non-metal found in the liquid state is

Bromine
Chlorine
Fluorine
Nitrogen

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Chemistry
The function of sedimentation tank in sewage treatment is to:

Disinfect the sewage
Remove suspended solids
Aerate the sewage
Remove water content

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Chemistry
What is the covalency of nitrogen in ammonia molecule

2
3
5
4

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