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Chemistry

Chemistry
A thick paste of cement, sand and water is called

Mortar
Concrete
R.C.C.
Kiln

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Chemistry
The enzyme that converts glucose to ethyl alcohol is :

Diastase
Maltase
Zymase
Invertase

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Chemistry
Acid rain is caused due to emission of which of the following in to the atmosphere ?

Carbon monoxide and nitrogen
Carbon dioxide and carbon monoxide
Oxides of nitrogen and sulphur
Ozone and carbon dioxide

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Chemistry
Bleaching powder is used in drinking water as a/an

Coagulant
Antiseptic
Antibiotic
Disinfectant

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

Alkalinity
Hardness
Eutrophication
Acidity

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Chemistry
Milk tastes sour when kept in the open for sometime due to the formation of

Citric acid
Acetic acid
Lactic acid
Carbonic acid

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