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Applications of Displacement Reaction

Four test tub...

Question

Four test tubes named as (i)-(iv) are half-filled with colourless aqueous solution of $A l_{2} (S O_{4})_{3}$ .
A piece of metal zinc was placed in test tube (i), iron in test tube (ii), copper in test tube (iii) and aluminium in test tube (iv). The final colour in the four test tubes are:

A

i \to Colourless, i i \to Blue i i i \to Green, i v \to Colourless

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B

i \to Colourless, i i \to Green i i i \to Blue, i v \to Colourless

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C

i \to Green, i i \to Blue i i i \to Colourless, i v \to Colourless

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D

i \to Colourless, i i \to Colourless i i i \to Colourless, i v \to Colourless

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Solution

The correct option is D $i \to Colourless, i i \to Colourless i i i \to Colourless, i v \to Colourless$
As per the reactivity series, reactivity of metals is $A l > Z n > F e > C u$ . As $Z n, F e$ and $C u$ , all are less reactive than $A l$ so, they do not displace $A l$ from $A l_{2} (S O_{4})_{3}$ solution. Therefore solution in test tubes remain colourless.

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