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Chemistry

Chemistry
Periodic table contains how many periods

10
7
6
8

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Chemistry
Which of the following is ozone depleting pesticide ?

D.T.
Methyl bromide
Benzene
Ethylene ozonide

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Chemistry
The two metal ions that cause hardness to water are:

Calcium, Magnesium
Sodium, Calcium
Sodium, Magnesium
Sodium, Potassium

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Chemistry
Zinc sulphide is commonly used as

Deodorant
Herbicide
Rodenticide
Fungicide

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Chemistry
Citric acid is present in free form in

Apple
Milk
Lemon
Tamarind

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Chemistry
Which one is the lightest element in the periodic table

Oxygen
Carbon
Hydrogen
Helium

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