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Chemistry

Chemistry
Acid rain is caused by

SO2 and NO2
CO2and CFCs
SO2 and particulates
NO2and particulates

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Chemistry
Aqueous solution of which of the following is a good conductor of electricity

Acetic acid
Glucose
Ammonium acetate
Ammonia

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Chemistry
Percentage of lead in lead pencils is

40
31-66
80

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Chemistry
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

All of these
O3
CO2
CO

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Chemistry
The three elements most needed in common fertilisers are :

Phosphorous, Sodium and Nitrogen
Nitrogen, Potassium and Phosphorous
Sulphur, Phosphorous and Sodium
Calcium, Phosphorous and Potassium

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Chemistry
Heating of a ore below its melting point in the absence of air is known as

Refining
Calcination
Smelting
Roasting

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