Chemistry Questions and Answers

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Q11
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is
  • A helium
  • B ozone
  • C oxygen
  • D methane
Answer: Option B
Q12
The most commonly used bleaching agent is
  • A alcohol
  • B carbon dioxide
  • C chlorine
  • D sodium chlorine
Answer: Option C
Q13
The nucleus of a hydrogen atom consists of
  • A 1 proton only
  • B 1 proton + 2 neutron
  • C 1 neutron only
  • D 1 electron only
Answer: Option A
Q14
The heat required to raise the temperature of body by 1 K is called
  • A specific heat
  • B thermal capacity
  • C water equivalent
  • D None of the above
Answer: Option B
Q15
The nuclear particles which are assumed to hold the nucleons together are
  • A electrons
  • B positrons
  • C neutrons
  • D mesons
Answer: Option D
Q16
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is
  • A 2.05 gram
  • B 3.05 gram
  • C 4.05 gram
  • D 5.05 gram
Answer: Option A
Q17
 The octane number of zero is assigned to
  • A 2-methyl octane
  • B n-heptane
  • C iso-octane
  • D 3-methyl octane
Answer: Option B
Q18
The metal that is used as a catalyst in the hydrogenation of oils is
  • A Ni
  • B Pb
  • C Cu
  • D Pt
Answer: Option A
Q19
The most abundant rare gas in the atmosphere is
  • A He
  • B Ne
  • C Ar
  • D Xe
Answer: Option C
Q20
The Latin word formica means ant. The name formic acid is derived from this Latin word because
  • A this acid, in ancient times, was used to eliminate ant-hills
  • B this corrosive acid is secreted by ants to drive away their enemies
  • C this acid was first obtained by the distillation of ants
  • D ants are attracted by the odour of this acid
Answer: Option C

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