Class X

The conversion of K2Cr2O7 into Cr2(SO4)3 is a process of
  1. Oxidation
  2. Reduction
  3. Decomposition
  4. Substitution
When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction SO2 + 2H2S → 2H2O + 3S occurs. Here hydrogen sulphide is acting as
  1. anoxidising agent
  2. a reducing agent
  3. a dehydrating agent
  4. a catalyst
An element, which never has a positive oxidation state in any of its compounds, is
  1. Boron
  2. Oxygen
  3. Chlorine
  4. Fluorine
The equation Cu + XHNO3 →Cu(NO3)2 + YNO2 + 2H2O, the value of X and Y are
  1. 3 and 1 respectively
  2. 8 and 6 respectively
  3. 4 and 2 respectively
  4. ) 7 and 1 respectively
A slow combustion in which glucose present in the body cells combine with oxygen to provide energy is
  1. digestion
  2. ) excretion
  3. respiration
  4. none of the above
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