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Chemistry

Chemistry
One carat of diamond is equal to

250 mg
200 mg
100 mg
150 mg

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Chemistry
Percentage of lead in lead pencils is

40
80
31-66

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Chemistry
Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ?

Eutrophication
Acidity
Alkalinity
Hardness

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Chemistry
Candle is a mixture of

Higher fatty acids and stearic acid
Paraffin was and stearic acid
Bees wax and paraffin wax
Bees wax and stearic acid

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Chemistry
Which of the following contains high content of lead?

Cooking gas
High octane fuel
Low octane fuel
Coal

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Chemistry
The three elements most needed in common fertilisers are :

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

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