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  4. Mn2O7 dissolves in water to give an acid. The colour of the acid is

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Q. $Mn_2O_7$ dissolves in water to give an acid. The colour of the acid is

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Solution:

$Mn _{2} O _{7}$ dissolves in water to give permanganic acid which is purple in colour.
$Mn _{2} O _{7}+ H _{2} O \longrightarrow \underset{\text { Purple }}{2 HMn O _{4}}$