Physical Chemistry Quiz - Chemistry Notes

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Physical Chemistry Quiz

Physical Chemistry Quiz

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1 / 31

1. The percentage of P2O5 in diammonium phosphate (NH4)2HPO4 is

a. 46.96

b. 53.78

c. 23.48

d. 71.00

2 / 31

2. Which of the following statements is incorrect about the adsorption theory?

a. Enhanced activity of a rough surfaced catalyst is explained

b. specific action of catalyst is explained

c. Action of promoters is not explained

d. The catalyst is more efficient in finely divided state

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3. Dry corrosion is

a. reducing in nature

b. electrochemical in nature

c. chemical in nature

d. electrolytic in nature

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4. The amount of zinc (atomic weight 65) required to produce 224ml of H2 at STP on treatment with dilute H2SO4 will be

a. 65gm

b. 0.065gm

c. 0.65gm

d. 6.5gm

5 / 31

5. When Pt and Zn are electrically connected, which one gets corroded?

a. Pt

b. cannot decide

c. Zn

d. both a and b

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6. Rust is hydrated

a. chromium oxide

b. lead oxide

c. Iron oxide

d. Zinc oxide

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7. Dry cell is an example of

a. dissimilar electrode

b. galvanic cell

c. concentration cell

d. differential temperature cell

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8. The specific heat of metal is 0.16, its approximate atomic weight would be

a. 64

b. 16

c. 40

d. 32

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9. 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?

a. 0.25

b. 4

c. 2

d. 7

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10. The type of corrosion that is very dangerous and difficult to monitor is

a. Pitting

b. Crevice

c. Uniform

d. Galvanic

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11. Which one of the following pairs of compounds illustrates the law of multiple proportions?

a. NH3 AND NCl3

b. H2S and SO2

c. CuO and Cu2O

d. FeCl2 and FeCl3

12 / 31

12. The modern atomic weight scale is based on.........

a. O-16

b. C-12

c. C-14

d. H-1

13 / 31

13. Which of the following is used as a catalytic promoter?

a. all of the above

b. Chlorine

c. Nitrate

d. Bromine

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14. From which of the following types of corrosion cavities or holes are produced on a metal surface?

a. Uniform corrosion

b. Pitting corrosion

c. Environment cracking

d. Concrete corrosion

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15. A metallic oxide contains 66% of the metal. The equivalent weight of the metal is

a. 12

b. 48

c. 40

d. 24

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16. Rusting of iron is an example of

a. soil corrosion

b. wet corrosion

c. galvanic corrosion

d. dry corrosion

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17. Stress corrosion, fatigue corrosion, and hydrogen embrittlement fall under the category of which type of corrosion?

a. Crevice corrosion

b. Uniform corrosion

c. Environment cracking

d. Pitting corrosion

18 / 31

18. The vapour density of a gas is 22. Its molecular weight will be.........

a. 11

b. 22

c. 44

d. 33

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19. During electro galvanizing technique, which metal is used to protect steels against corrosion?

a. Chromium

b. Nickel

c. Zinc

d. Lead

20 / 31

20. Quantum yield is related to...........

a. No. of photon absorbed

b. No. of molecules formed

c. No. of molecules reacted

d. All of the above

21 / 31

21. Rusting of Iron is enhanced by

a. alkali

b. oxygen

c. zinc

d. acid

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22. Cold light is emitted in

a. not possible

b. Fluorescence

c. Chemiluminescence

d. Phosphorescence

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23. The equivalent weight of calcium phosphate Ca3(PO4)2 is (Mol. wt. 310)

a. 310

b. 310/2

c. 310/3

d. 310/6

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24. If the equivalent weight of a trivalent metal is 32.7, the molecular weight of its chloride is

a. 68.2

b. 204.6

c. 103.7

d. 32.7

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25. Zincification involves ........................metal.

a. Zinc

b. Magnesium

c. Aluminum

d. Zirconium

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26. The law of reciprocal proportions can be used to determine.......

a. equivalent weights

b. none

c. atomic weight of a gas

d. molecular weights of gases

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27. Corrosion is accelerated by.....

a. all of the above

b. High temperature

c. Low PH

d. Moisture

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28. 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

a. 3

b. 2

c. 6

d. 5

29 / 31

29. In galvanic series, Which metals are most passive?

a. Pt

b. Zn

c. Al

d. Cu

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30. In which of the following combinations of galvanic cells, the rate of corrosion of magnesium is highest in

a. Mg and Ni

b. Mg and Zn

c. Mg and Pb

d. Mg and Au

31 / 31

31. The hydrogen phosphate of certain metals has the formula MHPO4. The formula of metal chloride would be

a. MCl2

b. MCl3

c. M2Cl2

d. MCl

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