Question

when a pale green coloured substance x is strongly heated in a hard test tube,it first turns white and then forms brownish black residue Y. with evolution of colour less gas Z smelling like burned sulphur.a) Write the chemical formulae of x,y and z.b)write the balanced chemical equation.

Answer 1

a) x - Ferrous sulfate: FeSO4
    y - Ferric oxide: Fe2O3
    z - Sulphur dioxide: SO2

b) 2 FeSO4 → Fe2O3 + SO2 + SO3

Answer 2

Values of X, Y, Z

X -  Ferrous Sulphate [ $FeSO_{4}$ ]

Y -  Ferric Oxide [ $Fe_{2}O_{3}$ ]

Z - A mixture of Sulphur Dioxide and Sulphur Trioxide [ $SO_2+SO_3$ ]

Balanced Chemical Equation -

2 $FeSO_4$ ⇒(on heating) $Fe_2O_3 + SO_2+SO_3$

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