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Variable Oxidation States

What is the o...

Question

What is the oxidation state of mercury in Nessler's reagent?

A

4

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B

1

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C

2

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D

0.0

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Solution

The correct option is C 2
Nessler's reagent is potassium tetraiodomercurate $H g I_{4} K_{2}$

Let the oxidation state of mercury be `x`
`x-4+2=0`
`x=+2`

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