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Chemistry

Chemistry
Among the following, carbonate ore of Zinc is

Calamine
Zincite
Zincblende
Sphalerite

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Chemistry
The metal chiefly used for galvanising iron is :

Mercury
Zinc
Tin
Cadmium

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Chemistry
Physico-chemical characteristics of water in water sources undergo changes due to

Effluents
Auatic fungi
Aquatic macrophytes
Evapotranspiration

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Chemistry
In arc welding, Argon is used because of its

High calorific value
Low reactivity with metal
High flammability
Ability to lower the melting point of the metal

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Chemistry
Brass is a solution of molten copper in

Gaseous zinc
Solid zinc
Molten zinc
Molten tin

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Chemistry
Which one of the following elements is least likely to be found in commercial fertilisers?

Potassium
Silicon
Phosphorous
Nitrogen

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