Question

a student added iron metal in two test tube A and B containing aqueous solutions of aluminium sulphate and copper sulphate. in which test tube the colour will chages

Answer 1

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$<marquee direction="right" behavior="alternate"><big><big><b>Answer:</b></big></big></marquee>$

$Test tube A contains AlSO₄ Test tube B contains CuSO₄$

$According to the reactivity series, Aluminium (Al) is more reactive than Iron (Fe). So Iron can't displace Aluminium from the solution. Hence, no reaction takes place in test tube A. So, no colour change takes place. Whereas, Copper (Cu) is less reactive than Iron (Fe). So, Iron can displace Copper from test tube B. A chemical reaction takes place. Hence, colour change can be observed in <b>test tube <font color="red"><big>B</big></font></b>.$

The reactions are as follows:
$<b><i>AlSO₄ + Fe</i> → No reaction <i>CuSO₄ + Fe</i> → <i>FeSO₄ + Cu</i></b>$

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