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Random Questions in Objective Chemistry

2 pages, 35 questions, 30 questions with responses, 33 total responses,    0    0
Utkarsh Kushwaha
North Point School, Koparkhairane, Navi Mumbai
2nd to 10th Science
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Random Questions in Objective Chemistry Name the following: 1. The most radioactive alkali metal 2. An Organic liquid which bursts into flames on addition of conc. nitric acid. 3. A metallic sulphide soluble in water 4. An explosive formed when ammonia reacts with excess of chlorine 5. A gas having a pungent choking smell, used to bleach fruit juices 6. An unsaturated hydrocarbon formed by dehydration of ethyl alcohol with concentrated sulphuric acid 7. A coloured metallic hydroxide insoluble in excess of sodium hydroxide but soluble in excess of ammonium hydroxide 8. A salt which decomposes on heating to give a metal as residue 9. An insoluble salt formed from two soluble salt solutions, one of which is sodium chloride solution 10.A metallic sulphide insoluble in water. 11. The colour of Xanthoproteic acid 12. A nitrate which leaves a black residue on heating 13. The compound also known as chile salt petre 14. The catalyst used for conversion of sulphur dioxide to sulphur trioxide 15. A substance used to absorb arsenic impurity Give reasons for the following: 1. Large quantities of sulphuric acid are used in iron and steel industry. 2. All glass apparatus should be used in preparing nitric acid by heating conc. sulphuric acid and potassium nitrate. 3. Lime juice has a sour taste but lime water is bitter. 4. During electroplating, a small current should be used for a longer time. 5. Aluminum is extracted from its oxide by electrolytic reduction and not by conventional reducing agents. 6. Ammonia is unionized in the gaseous state but in the aqueous solution is a weak electrolyte. 7. Carbon tetrachloride is liquid but does not conduct electricity. 8. Why is it necessary to add an acid to water before proceeding with electrolysis of water 9. Aluminum is used in flash bulbs. 10. Non metals are good oxidizing agents. 11. The catalyst chamber in the formation of ammonia provided with ammonia exchanger 12. Ammonia is present in sewage water. 13. Ammonia is used as a cleansing agent 14. Commercial concentrated nitric acid is yellow, but turns colorless when diluted with water. 15. In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated above 200 degrees centigrade.

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