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Chemistry

Chemistry
Among the following, carbonate ore of Zinc is

Sphalerite
Zincblende
Zincite
Calamine

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

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

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Chemistry
The metallic constituents of hard water are :

Calcium, magnesium and iron
Magnesium, tin and iron
Iron, tin and calcium
Magnesium, calcium and tin

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Chemistry
The main active constituent of tea and coffee is

nicotine
caffeine
chlorophyll
aspirin

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Chemistry
The most malleable metal is

silver
gold
platinum
iron

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Chemistry
Muddy water is treated with alum in purification process, itis termed as :

Absorption
Coagulation
Adsorption
Emulsification

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