example of each a chemical reaction showing evolution of gas change in substance colour during chemical reaction
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1.chemical reaction involving EVOLUTION OF GAS= in may chemical reaction one of the product is gas
eg:- when zinc reacts with dil. sulphuric acid, hydrogen gas is evolved
Zn+H2SO4=ZnSO4+H2
2.chemical reaction involving CHANGE IN COLOUR= certain chemical reactions are characterized by a change in colour of the reactants
eg:- when a few pieces of iron are dropped in a blue coloured copper sulphate sol., the blue colour of the sol, fades and eventually turns into light green due to formation of ferrous sulphate.
Fe+CuSO4=FeSO4+Cu
eg:- when zinc reacts with dil. sulphuric acid, hydrogen gas is evolved
Zn+H2SO4=ZnSO4+H2
2.chemical reaction involving CHANGE IN COLOUR= certain chemical reactions are characterized by a change in colour of the reactants
eg:- when a few pieces of iron are dropped in a blue coloured copper sulphate sol., the blue colour of the sol, fades and eventually turns into light green due to formation of ferrous sulphate.
Fe+CuSO4=FeSO4+Cu
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