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An inorganic salt when heated evolves a coloured gas which bleaches moist litmus paper. The evolved gas is

(a) $NO_2$
(b) $Cl_2$
(c) $Br_2$
(d) $I_2$
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1 Answer

Answer: $Cl_2$
 
$Cl_2$ is a greenish yellow gas which bleaches litmus paper by oxidation
$Cl_2 + H_2O \longrightarrow 2HCl + [O]$
Litmus + [O] $\longrightarrow$ colourless oxidised form
answered Feb 1, 2014 by mosymeow_1
 
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