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Chemistry

Chemistry
Gypsum is used for improvement of:

Alkaline soils
Saline soils
Acidic soils
Podsols

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Chemistry
In sugar solution,

Sugar is solvent, water is solute
Sugar is solute, water is solvent
Both are solvents
Both are solutes

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Chemistry
Percentage of lead in lead pencils is

80
40
31-66

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Chemistry
Which one of the following organic compound is used to remove stains of iron compounds?

Benzoic acid
Cinnamic acid
Phthalic acid
Oxalic acid

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Chemistry
Of the following, which one pollutes the air of a big city ?

Chromium
Copper
Cadmium
Lead

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Chemistry
Which of the following has no unit

Excitation potential
Electron affinity
Ionization energy
Electronegativity

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