Free Printable Potentiometric titration using quinhydrone electrode

1.

Check all that is applicable to Quinhydrone

a)

Bronze coloured needle shaped crystals

b)

It is highly soluble in water .

c)

It is equimolar mixture of Quinone and hydroquinone.

d)

It is used in the determination of pH of the solution

e)

It is a type of redox electrode

2.

A ___________ wire electrode is immersed in a saturated aqueous solution of quinhydrone and given acid solution.

a)

Silver

b)

Copper

c)

platinum

d)

Aluminium

3.

What is the Nernst equation for the reaction in the image displayed.

a)

$E\ cell\ =\ E^0cell\ -\frac{0.059}{2}\ \log\ \left[a\ H^+\right]^2$

b)

$E\ cell\ =\ E^0cell\ +\frac{0.059}{2}\ \log\ \left[a\ H^+\right]^2$

c)

$E\ cell\ -\ E^0cell\ =\ \frac{0.059}{2}\ \log\ \left[a\ H^+\right]^{ }$

d)

$E^0cell\ =\ \frac{0.059}{2}\ \log\ \left[a\ H^+\right]^2$

4.

Name the indicator electrode used in this experiment .

(a)

5.

Name the reference electrode used in this experiment.

(a)

6.

In the construction of the electrochemical cell, reference electrode is connected to the _____________terminal.

a)

positive

b)

negative

7.

The potentiometer is calibrated by checking the potential of the inbuilt standard cell. The potential on the display should be _____________volts

a)

1.0183

b)

0.989

c)

0.2415

d)

0. 777

8.

In this experiment Emf of the cell is obtained by the expression, E_cell = __________________

a)

E_quin- E_SCE

b)

E_{quin +}E_SCE

c)

E_SCE- E_quin

d)

E_{SCE +} E_quin

9.

Electrode potential of Quinhydrone electrode depends on

a)

Amount of Quinhydrone powder added

b)

Amount of Quinhydrone powder added

c)

Concentration of Hydrogen ions in the solution

d)

the reference electrode used.

10.

The standard electrode potential of quinhydrone electrode is

a)

0.242 V

b)

0.699V

c)

0.771V

d)

0.457 V

11.

$.$ pH of the acid solution is calculated using the formula
pH = ____________

a)

$pH=\frac{\left(\ 0.457\ -E_{quin}\ \right)}{0,05916}$

b)

$pH=\frac{\left(\ 0.457\ -Ecell\ \right)}{0.05916}$

c)

$pH=\frac{\left(\ 0.457\ -E_{ref}\ \right)}{0.05916}$

12.

Which of the following electrodes is not used to measure pH of a solution?

a)

Glass electrode

b)

Quinhydrone electrode

c)

Standard Hydrogen Electrode

d)

Hydrogen gas electrode

13.

in the electrochemical cell representation, II indicates ,

a)

cathode

b)

anode

c)

salt bridge

14.

In the experiment , Calomel electrode is connected to

a)

negative terminal

b)

positive terminal

15.

The quinhydrone electrode is set up by dissolving quinhydrone powder in the acid solution and inserting ________wire for electrical contact.

a)

Platinum

b)

silver

c)

Neobium

d)

tin

16.

A pinch of the quinhydrone powder is added to the acid solution and stirred vigorously till it imparts

a)

Red colour

b)

greenish red colour

c)

golden yellow colour

d)

dark black colour

17.

An electrode with a fixed potential is

a)

anode

b)

cathode

c)

indicator electrode

d)

reference electrode

18.

Mercury covered by a layer of mercurous chloride in contact with saturated potassium chloride solution is a description of which of the following types of electrodes?

a)

sodium

b)

calcium

c)

silver/silver chloride

d)

calomel

19.

In salt bridge KCl or KNO₃ are used because......

a)

they are highly soluble

b)

they are electrolyte

c)

ionic mobilities of ions are nearly same

d)

they are cheap

20.

The internal reference electrode in glass electrode is.....

a)

SCE

b)

glass membrane

c)

mercury

d)

Ag-AgCl

21.

In quinhydron electrode there is equimolar mixture of

a)

quinone and quinoline

b)

quinone and hydroquinone

c)

quinone and quinoid

d)

hydroquinone and sodium hydroxide

22.

Quinhydron electrode cannot be used in determination of pH when combined with SCE beyond the pH ------

a)

2

b)

4

c)

14

d)

8

23.

Quinhydron electrode can not be use in the presence dil. HNO₃ and unsaturated organic acids.

a)

True

b)

False

Potentiometric titration using quinhydrone electrode

Total questions: 23

Worksheet time: 13mins

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