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05/09/2021 6:09 pm
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Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in the figure.
What will be the action of gas on
(a) dry litmus paper?
(b) moist litmus paper?
Write a balanced chemical equation for the reaction taking place.
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05/09/2021 6:12 pm
(a) The gas is sulphur dioxide (SO2). It will not react with dry litmus paper.
(b) The gas will bleach moist litmus paper. The moist litmus paper changes into red, as the gas is dissolved in moisture to give sulphurous acid.
The balanced chemical equation involving the formation of gas is:
S(s) + O2(g) + Heat → SO2(g)
SO2(g) + H2O(l) → H2SO3(aq)