Chemistry Questions and Answers

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Q61
The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
  • A chain isomerism
  • B functional group isomerism
  • C positional isomerism
  • D metamerism
Answer: Option C
Q62
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
  • A 1/6
  • B 1/3
  • C 1/8
  • D 1/4
Answer: Option C
Q63
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
  • A 4
  • B 5
  • C 2
  • D zero
Answer: Option A
Q64
The National Chemical Laboratory is situated in
  • A New Delhi
  • B Bangalore
  • C Pune
  • D Patna
Answer: Option C
Q65
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
  • A 2 : 16 : 2
  • B 2 : 16 : 1
  • C 1 : 16 : 2
  • D 1 : 1 : 1
Answer: Option C
Q66
The mass number of an atom is equal to
  • A the number of protons
  • B the number of protons and electrons
  • C the number of nucleons
  • D the number of neutrons
Answer: Option C
Q67
The maximum number of covalent formed by nitrogen is
  • A 1
  • B 2
  • C 3
  • D 4
Answer: Option D
Q68
The metal that is usually extracted from sea water is
  • A Ca
  • B Na
  • C K
  • D Mg
Answer: Option D
Q69
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
  • A liquation
  • B leaching
  • C levigation
  • D magnetic separation
Answer: Option C
Q70
The inert gases are ____ in water
  • A sparingly soluble
  • B insoluble
  • C soluble
  • D None of these
Answer: Option A

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