chemistry MCQs – Page 2

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
21. A method of separation of components from its solution using Distribution law is ___________________?
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A. Solvent extraction

B. Distillation

C. Sublimation

D. Crystallisation

22. For which system does the equilibrium constant Kc has unit of (concentration)-1__________________?
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A. N2+3H2 2NH3

B. H2+I2 2HI

C. 2NO2 N2H4

D. PCI5 PCI3+CI2

23. Which of the following methods is used to estimate hydrogen in an organic compound ?
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A. All of the above methods are for different purposes

B. Combustion method

C. Dumas method

D. Kjeldahls method

24. Which of the following points are important in connection with equilibrium constant ?
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A. Kc is unaffected by change in concentration of reactants or products

B. All of the above

C. Kc indicates the extent of reaction but not about the rate of reaction.

D. Kc is constant at given temperature

25. Which of the following terms is used for the mass of chlorine 35.5 ?
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A. relative atomic mass

B. mass number

C. atomic weight

D. relative isotopic mass

26. Industrial materials thermal power stations are coated with__________________?
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A. Epoxy paints

B. Polyester resins

C. polyamide resins

D. Polyvinyl chloride

27. In solids the temperature is the measure of__________________?
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A. Vibrational kinetic energy

B. Average kinetic energy of molecules

C. None of the above

D. Translational kinetic energy

28. Which of the following elements has greater 1st ionization energy__________________?
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A. N

B. O

C. B

D. C

29. A solution has pH = 0 its H+ ion concentration is__________________?
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A. 1 x 10-1

B. 1 x 10-7

C. 1 x 10-14

D. 1
30. Bohrs model is contradicted by__________________?
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A. Plancks theory

B. Heisenbergs uncertainty principle

C. Dual nature of matter

D. All of these

31. Which of the following element doesnot show allotropy_________________?
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A. Arsenic

B. Nitrogen

C. Carbon

D. Sulphur

32. Which of the solid does not contain covalent bond__________________?
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A. copper

B. diamond

C. ice

D. graphite

33. 1 mole of electron has mass in microgram_________________?
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A. 1.673 x 10-3

B. 1.84 x 10-4

C. 1.008 x 10-3

D. 5.5 x 10-4
34. Which of the following properties prove that cathode rays are material in nature_________________?
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A. all of the above

B. they are negatively charged

C. they cast shadow

D. they possess momentum
35. For industrial preparation of CH3CHO catalytic promoter is_________________?
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A. CuCl2

B. Cu2Cl2

C. PdCl2

D. PbCl2

36. The process of fermentation involves all the enzymes except__________________?
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A. Invertase

B. Sucrase

C. Zymase

D. Diastase

37. The common name of propane -1 3-dioic acid is____________________?
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A. Succinic acid

B. Fumaric acid

C. Malonic acid

D. Oxalic acid

38. Which of the following elements conduct electricity and also melts below 100C ?
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A. Sulphur

B. Aluminium

C. Carbon

D. Sodium
39. The metallic sound produced by engine due to the pre-ignition of fuel is called _______________?
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A. a and c

B. knocking

C. cracking

D. reforming

40. What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3 ?
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A. 6

B. 4

C. 2

D. 3