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The presence of which of the following salts in water causes
corrosion in steam boilers?
1 Sodium chloride
2 Magnesium chloride
3 Calcium bicarbonate
4 Potassium bicarbonate
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The purest form of iron is 1 Steel 2 Cast iron 3 Pig iron 4 Wrought iron
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What is the speed of arihant?
tea will coll most easily in a:
Define science
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The Contact Process is involved in the manufacture of 1 Nitric acid 2 Sulphuric acid 3 Ammonia 4 Caustic soda
The neutral atom’s two isotopes differ in the number of 1 Electron shells 2 Protons 3 Valence electrons 4 Neutrons
Which of the following is used in making smoke bombs? 1 Sulphur 2 phosphorus 3 Hydrogen 4 Carbon
Why sun seems to be a red colour while sun-rising and sun- setting?
infra-red rays were first detected by? the intensity level of sound is measured in? the material used for a fuse wire should? radioactivity is a property of? what is the source of electric energy in an artificial satellite? the following is used as a lubricant in heavy machines? supher, bauxite , graphite, phosphorus
What is the Organic Evolution ?
The material used for bleaching paper pulp is 1 Chlorine 2 Caustic soda 3 Sodium hypochlorite 4 Lime
Biological Sciences 
