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(a)When HCI reacts with finely powdered ...

(a)When HCI reacts with finely powdered iron , it forms ferrous chloride and not ferric chloride. Why ?
(b) Chlorine water tuns blue litmus red but solution becomes colourless after sometime.

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(a)It forms `H_2` gas.
`Fe+2HCl to FeCl_2+H_2`
Liberation of hydrogen prevents the formation of ferric chloride.
(b)Blue litmus change into red due to acidic nature `(Cl_2+H_2OtoHOCl+HCl)` but it is bleaching agent also (oxidising agent), therefore, it decolourises the red litmus.
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