General Science Chemistry MCQs

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination

31. Which of the following is correct about HCl gas?

[A] It is a colourless and pungent smelling gas
[B] It is extremely soluble in water
[C] Both a and b
[D] None

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32. Which of the following is NOT correct about Ethanol?

[A] It is a good solvent
[B] It gives out hydrogen when reacted with Sodium
[C] It is an odorless liquid
[D] All are correct

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33. What is an alloy of mercury with some other metal generally known as?

[A] Galinston
[B] Amalgam
[C] Megalium
[D] Yellow metal

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34. Bayer process is related to which of the following?

[A] production of Copper oxide
[B] production of Alumina
[C] production of Zinc oxide
[D] production of Silicon dioxide

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35. Which of the following is correct about the principal quantum number?

[A] It determines the size of the orbital
[B] It can have positive integer values
[C] It identifies the shell
[D] All of the above

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36. What is the total number of allowed orbitals in a shell, if principal quantum number is n?

[A] n
[B] 2n
[C] n2
[D] n3

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37. Which of the following quantum numbers is not necessary to identify an orbital?

[A] Principal quantum number
[B] Azimuthal quantum number
[C] Magnetic quantum number
[D] Electron Spin quantum number

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38. Which of the following are the limitations of Bohr’s model of atom?

[A] it cannot explain spectrum of atoms containing more than one electron
[B] it cannot explain the Zeeman effect
[C] it cannot explain the Stark effect
[D] All of the above

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39. Which of the following substance was used as a moderator in CIRUS reactor?

[A] Heavy water
[B] water
[C] solid graphite
[D] No moderator was used

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40. Which of the following alpha-emitter is commonly used in smoke detectors?

[A] Bismuth – 209
[B] Amrecium-231
[C] Uranium-238
[D] Protactinium-231

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