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Chemistry

Chemistry
Gypsum is used for improvement of:

Alkaline soils
Saline soils
Podsols
Acidic soils

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Chemistry
Browning of paper in old books is caused by

Lack of aeration
Oxidation of cellulose
Collection of dust
Frequent use

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Chemistry
Which one is heaviest naturally-occurring element of the periodic element

Iron
Uranium
Rhodium
Thorium

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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 structure of (HPO3)3 is

Tetrahedral
Linear
Cyclic
Octahedral

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Chemistry
Sodium is produced by the electrolysis of

Aqueous brine solution
Molten sodium chloride
Molten sodium carbonate
Its cyanide complex

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