Chemical change does not take place in case of
1 Souring of milk into curd
2 Rusting of iron in atmosphere
3 Burning of magnesium ribbon in air
4 emitting of light by a red hot platinum wire
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(4) emitting of light by a red hot platinum wire
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Superphosphate fertilizer is prepared by the reaction between 1 Calcium phosphate and Sulphuric hydroxide 2 Sodium phosphate and Sodium nitrate 3 Magnesium phosphate and Sodium nitrate 4 Sodium sulphate and Phosphoric acid
2 Answers Central Police Forces, Odisha Police,
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Which of the following is in liquid form at room temperature? 1 Cerium 2 Sodium 3 Francium 4 Lithium
Heavy water is 1 Tritium oxide 2 Deuterium oxide 3 Rain water 4 None of these
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In laundry soaps, a material called ‘filler’ is used. Which of the following is a ‘filler? 1 Talc 2 Sodium silicate 3 Soda ash 4 Sodium phosphate
What is difference between nanoscience and nanotechnology?
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