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Uses of Hydrogen

If zinc piece...

Question

If zinc pieces are added yellow to $F e C l_{3}$ solution, it turns to very light green. It is because :

F e C l_{3}

solution is acidic due to hydrolysis and zinc added produces nascent hydrogen causing reduction of

F e C l_{3}

F e C l_{2}

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F e C l_{3}

solution is basic and zinc added produces

H_{2}

which reduceds

F e C l_{3}

F e C l_{2}

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zinc reduces

F e C l_{3}

F e C l_{2}

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none of the above is correct

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Solution

The correct option is B $F e C l_{3}$ solution is acidic due to hydrolysis and zinc added produces nascent hydrogen causing reduction of $F e C l_{3}$ to $F e C l_{2}$
Ferric chloride on hydrolysis produces acidic solution.
$F e C l_{3} + 3 H_{2} O \to F (O H)_{3} + 3 H C l$
Zinc reacts with water produces nascent hydrogen.
$Z n + H_{2} O \to Z n O + H_{2}$
This nascent hydrogen reduces $F e^{3 +}$ to $F e^{2 +}$ .
Hence, the colour changes to very light green.

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Similar questions

Q. Assertion :On adding zinc pieces to aqueous

F e {C l}_{3}

solution, colour changes from deep yellow to light green. Reason: Aqueous

F e {C l}_{3}

is acidic and on adding

Z n

nascent hydrogen is produced which reduces deep yellow

F e {C l}_{3}

solution to light green

F e {C l}_{2}

solution.

Q. Assertion :

F e C l_{3}

can be reduced to

F e C l_{2}

S n C l_{2}

as well as by the addition of

S n

into it. Reason: This reaction is possible since

S n^{4 +}

is more stable than

S n^{2 +}

(inert-pair effect)Also,

F e C l_{3}

solution is acidic due to hydrolysis.

S n

added reacts with

H C l

forming nascent hydrogen that can reduce

F e C l_{3}

F e C l_{2}

Q. Assertion :

S n C l_{2}

is a reducing agent. Reason:

S n C l_{2}

reduces

F e C l_{3}

F e C l_{2}

and

H g C l_{2}

H g

Q. The lesser covalency of

F e C l_{2}

over

F e C l_{3}

is due to:

Q. Colourless salt

A

decolorises

I_{2}

solution and gives white precipitate (changing to black) with

A g N O_{3}

solution.

A

also changes

F e C l_{3}

(yellow) solution to

F e C l_{2}

(green). Identify

A

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If zinc pieces are added yellow to FeCl3 solution, it turns to very light green. It is because :

If zinc pieces are added yellow to $F e C l_{3}$ solution, it turns to very light green. It is because :