Question

Following ions are given Cr2+, Cu2+ , Cu+, Fe2+ , Fe3+, Mn3+
Identify the ion which is
1 A strong reducing agent
2 Unstable in aqeous solution
3 A strong oxidising agent
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Answer 1

Answer:

Cu+

Cu+

Fluorine

Explanation:

Hope it helps you

Answer 2

From the given ions

1) A strong reducing agent is

${cr}^{2 + }$

2) Unstable in aqeous solution is

${cu}^{ + }$

3) A strong oxidising agent is

${cu}^{2 + }$

Reasons

• ${cr}^{2 + }$

It refers to chromium (2+). This ion contains 24 elctrons.

But(+2) shows that 2 electrons are lost and hence it has 22 elctrons in total.

${e } ^{o} _{ {cr}^{3 + } \div {cr}^{2 + } } = - 0.41v$

This is the reason it is a strong reducing agent.

• ${cu}^{ + }$

It is cuprous ion. It has a total of 29 elctrons.

As the enthalphy( sum of the product of pressure,internal energy of the thermodynamics system in chemistry) of hydration of the above ion is very small compared to other ions. Hence it is unstable in aqeous solution.

• ${cu}^{2 + }$

It is copper(II) cation.

It has larger charge density than {cu}^{ + }

It has a total of 27 electrons.

As this ion has the nature of reducing with

${e}^{o}$

with the value of +0.34v, it acts as a strong oxidising agent .