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10th Class Science Chemical Reactions and Equations Question Bank 10th CBSE Science Chemical Reactions and Equations

  • question_answer
      On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. (a) Write a balanced chemical equation of the reaction. (b) Identify the brown gas X evolved. (c) Identify the type of reaction. (d) What could be the pH range of the aqueous solution of the gas X?

    Answer:

                      (a) (b) The brown gas X is nitrogen dioxide,   (c) Thermal decomposition.                 (d) Reason  dissolves in water to form acidic solution (pH range below 7). 


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