Question

1. Why are metals not found in their free state?

2. If a strip of aluminium with a clean surface is dipped in aqueous solution of copper sulphate for a little time, the surface if aluminium becomes brownish. Explain the reason.​

Answer 1

Answer:

metals are not found in free state as they are mined through the ores which have impurities present in them i.e carbon and carbon substances. these impurities can be removed by sugar charcoal.

2. al +cuS04------->alSo4 + cu

as the copper becomes red or brownish

////////BASED ON MY PREVIOUS STUDIES

Explanation:

all you can se

Bye mate,

Answer 2

Answer :

1.

• Most of the metals are not found in their free states but only as compounds, i.e., in their combined state. It is because their position is above hydrogen in the chemical reactivity series and hence readily react with air, water, carbon dioxide, etc.

• Therefore, they are very reactive and unstable and are found in the form of their sulphides, carbonates or oxides.

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2.

• Aluminium is a more reactive metal than copper. Hence, when a strip of aluminum is dipped into an aqueous solution of copper sulphate, it will displace copper from the solution and forms aluminum sulphate.

• Copper in turn, will deposit on the surface of aluminium strip which gives it a brown coat (becomes brownish). This process is also a clear example of a displacement reaction.

• Reaction is as follows:-

$\rm{\underset{\text{Copper sulphate}}{3CuSO_{4(aq)}}+\underset{\text{Aluminium}}{2Al_{(s)}}\longrightarrow{}\underset{\text{Aluminium sulphate}}{Al_2(SO_4)_{3(aq)}}+\underset{\text{Copper}}{3Cu_{(s)}}}$