Chemistry Questions and Answers

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Q41
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
  • A 3 billion years
  • B 100 years
  • C 0.01 minute
  • D 13 days
Answer: Option C
Q42
The gas used for artificial ripening of green fruit is
  • A ethylene
  • B ethane
  • C carbon dioxide
  • D acetylene
Answer: Option A
Q43
Zone refining is used for the purification of
  • A Au
  • B Ge
  • C Ag
  • D Cu
Answer: Option B
Q44
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
  • A cineole
  • B engenol
  • C geraniol
  • D limonene
Answer: Option A
Q45
The molecule which has the highest percentage of ionic character among the following is A.
  • A HI
  • B HF
  • C HCI
  • D HBr
Answer: Option B
Q46
The high reactivity of fluorine is due to
  • A its high electro negativity
  • B small size of fluorine atom
  • C availability of d-orbitals
  • D strong F - F bond
Answer: Option A
Q47
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
  • A 5x/36
  • B 5x
  • C 7.2 x
  • D x/6
Answer: Option A
Q48
The major constituent of air is
  • A nitrogen
  • B carbon dioxide
  • C oxygen
  • D hydrogen
Answer: Option A
Q49
 The main chemical constituent of clay is
  • A silicon oxide
  • B aluminium borosilicate
  • C zeolites
  • D aluminium silicate
Answer: Option D
Q50
The mineral containing both magnesium and calcium is
  • A magnesite
  • B calcite
  • C carnallite
  • D dolomite
Answer: Option D

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