Class X

An element, which never has a positive oxidation state in any of its compounds, is
  1. Boron
  2. Oxygen
  3. Chlorine
  4. Fluorine
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
Which of the following is not a decomposition reaction?
  1. CaCO3 →CaO + CO2
  2. H2 + Cl2 → 2HCl
  3. H2CO3 → H2O + CO2
  4. 2KClO3 → 2KCl + 3O2
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
Which of the following reaction will not take place?
  1. Zn + FeSO4 → ZnSO4 + Fe
  2. 2KI + Cl2 → 2KCl + I2
  3. ) Zn + MgSO4 → ZnSO4 + Mg
  4. ) Zn + MgSO4 → ZnSO4 + Mg
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