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Chemistry

Chemistry
The nuclear particles which are assumed to hold the nucleons together are

electrons
positrons
neutrons
mesons

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Chemistry
The percentage of nitrogen present in ammonium sulphate is :

0.18
0.25
0.27
0.305

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Chemistry
Which halide is used in making sensitive emulsion on photograhic film?

Silver chloride
Sodium chloride
Silver bromide
Silver iodide

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Chemistry
The natural source of hydro-carbon is

Carbohydrates
Coal
Biomass
Crude oil

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Chemistry
Main source of lead pollution is from

Tobacco
Leaded gasoline
Sewage
Insecticides

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Chemistry
Chemical composition of cement is

Limestone and Clay
Clay and Gypsum
Limestone, Clay and Gypsum
Limestone and Gypsum

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