Single Choice

A solution containing $$Fe^{2+}$$ ions is titrated with $$KMnO_{4}$$ solution. Indicator used will be:

Aphenolphthalein
Bmethyl orange
Clitmus
Dnone of the above
Correct Answer

Solution

Titration of $${ Fe }^{ 2+ }$$ with $${ KMnO }_{ 4 }$$ is an redox titration.
$${ Fe }^{ 2+ }+\underbrace { 7{ MnO }_{ 4 }^{ - } } +14{ H }^{ + }={ Fe }^{ 3+ }+\underbrace { 7{ Mn }^{ 2+ } } +7{ H }_{ 2 }O$$
violet colourless
So, phenolpthalein, methyl orange and litmus are all acid base indicators. They can't be used in this redox titration. $${ KMnO }_{ 4 }$$ is a self-indicator changing from violet to colourless.
$$\therefore$$ Answer will be $$D$$.

SIMILAR QUESTIONS

Acids, Bases and Salts

In the titration of $$NaOH$$ and $$HCl$$, which of the following indicator will be used?

Acids, Bases and Salts

In the titration of strong acid and weak base, the indicator used is:

Acids, Bases and Salts

Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?

Acids, Bases and Salts

Which of the following indicator is most suitable for titration of $$HB$$ with strong base

Acids, Bases and Salts

The best indicator for the detection of endpoint in the titration of a weak acid and a strong base is:

Acids, Bases and Salts

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Acids, Bases and Salts

A solution containing $$Na_{2}CO_{3}$$ and $$NaOH$$ requires $$300\ mL$$ of $$0.1\ N\ HCl$$ using phenolphthalein as an indicator. Methyl orange is then added to the above-titrated solution when a further $$25\ mL$$ of $$0.2\ N\ HCl$$ is required. The amount of $$NaOH$$ present in the original solution is:

Acids, Bases and Salts

A solution containing $$Fe^{2+}$$ ions is titrated with $$KMnO_{4}$$ solution. Indicator used will be:

Acids, Bases and Salts

The indicator used in iodometric titrations is:.

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