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Physical Chemistry Quiz
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1. The ratio of the rates of diffusion of a given element to that of helium is 4. What will be the molecular weight of the element?
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2. The vapour density of a gas is 22. Its molecular weight will be.........
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3. Dry corrosion is
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4. Which of the following statements is incorrect about the adsorption theory?
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5. Quantum yield is related to...........
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6. Cold light is emitted in
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7. Dry cell is an example of
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8. If the equivalent weight of a trivalent metal is 32.7, the molecular weight of its chloride is
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9. From which of the following types of corrosion cavities or holes are produced on a metal surface?
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10. In galvanic series, Which metals are most passive?
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11. The equivalent weight of calcium phosphate Ca3(PO4)2 is (Mol. wt. 310)
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12. Which of the following is used as a catalytic promoter?
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13. The hydrogen phosphate of certain metals has the formula MHPO4. The formula of metal chloride would be
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14. The percentage of P2O5 in diammonium phosphate (NH4)2HPO4 is
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15. During electro galvanizing technique, which metal is used to protect steels against corrosion?
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16. The formula of metallic hydroxide (eq. wt. = 150) is M(OH)2. x. H2O. If the atomic weight of the metal is 176 then, the value of x will be
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17. Rust is hydrated
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18. Which one of the following pairs of compounds illustrates the law of multiple proportions?
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19. Rusting of iron is an example of
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20. Stress corrosion, fatigue corrosion, and hydrogen embrittlement fall under the category of which type of corrosion?
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21. When Pt and Zn are electrically connected, which one gets corroded?
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22. The amount of zinc (atomic weight 65) required to produce 224ml of H2 at STP on treatment with dilute H2SO4 will be
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23. Corrosion is accelerated by.....
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24. The law of reciprocal proportions can be used to determine.......
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25. The specific heat of metal is 0.16, its approximate atomic weight would be
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26. In which of the following combinations of galvanic cells, the rate of corrosion of magnesium is highest in
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27. Zincification involves ........................metal.
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28. A metallic oxide contains 66% of the metal. The equivalent weight of the metal is
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29. Rusting of Iron is enhanced by
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30. The type of corrosion that is very dangerous and difficult to monitor is
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31. The modern atomic weight scale is based on.........
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