Question

refer the above attachment and answer ! Complete explanation needed !! Wrong answers would be reported !!​

Answer 1

The gas is (B) SO3 or Sulphur Trioxide.

When you heat hydrated Iron sulphate (FeSO4.7H2O).

Two reactions take place:

1) FeSO4.7H2O (heat)-------------> FeSO4 + 7H2O

2) 2FeSO4 (strong heating)-----------> Fe2O3 + SO2 + SO3

=> When it is heated very strongly, then the second reaction takes place giving out both Sulphur Dioxide and Sulphur trioxide gases in small quantities.

=> Both these gases are strongly acidic and react with water as shown:

SO2 + H2O ---------> H2SO3 (Sulphurous acid)

SO3 + H2O ----------> H2SO4 (Sulphuric acid)

=> Thus, these gases turn moist blue litmus red.

Answer 2

Answer:

The green colour of ferrous sulphate crystals changes to brownish black ferric oxide and smell of burning Sulphur dioxide is observed.

$\mathtt{ \color{blue}2FeSO_{4}(s) \to Fe_{2}O_{3} (s)+ SO_{2}+(g) + SO_{3} (g)}$

$\mathtt \color{orange}{⚡So \: the \: correct \: option \: is \: SO_3}$

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More to know !!

⚡ Chemical Reaction- the breaking and making of bonds between different atoms to produce new substance is called chemical reaction

⚡ chemical equations- the representation of chemical reaction in form of formulas of reactants and products separated by an arrow mark

⚡ Combination reaction when two elements or one element and one compound or other two compound combine to give one single product.

⚡ Decomposition reaction- splitting of a compound into two or more simpler products.

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