Chemical Reactions and Equations


(i) Write two observations when lead nitrate is heated in a test tube.

(ii) Name the type of reaction.

(iii) Write a balanced chemical equation to represent the above reaction.

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On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed.

  1. Identify the type of reaction and the gas X.
  2. Write balanced chemical equation of the reaction.
  3. Write the pH range of aqueous solution of the gas X.
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In the reaction:

MnO2 + 4HCl → MnCl2 + 2H2O + Cl2

  1. Name the compound (i) oxidised, (ii) reduced.
  2. Define oxidation and reduction on its basis.
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Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity.

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