Free Printable TYBSc Quiz Assignment-3 Electrochemical cell

1.

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

2.

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

a)

SCE

b)

glass membrane

c)

mercury

d)

Ag-AgCl

3.

The thin glass bulb in glass electrode is filled with

a)

0.1 M KCl saturated with AgCl

b)

0.1 M KCl saturated with Hg₂Cl₂

c)

0.1 N HCl saturated with AgCl

d)

0.1 N HCl saturated with Hg₂Cl₂

4.

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

5.

The pH of the unknown H+ ion solution can be calculated by combing hydrogen gas electrode with SCE at 298 K according to equation

a)

pH=E_{cell}-E_{SCE\left(ox\right)}

b)

$pH=\frac{E_{cell}-E_{SCE\left(ox\right)}}{2.303R}$

c)

$pH=\frac{E_{cell}+E_{SCE\left(ox\right)}}{0.0591}$

d)

$pH=\frac{E_{cell}-E_{H_2\left(ox\right)}}{E_{SCE\left(ox\right)}}$

6.

When the quinhydron electrode is combine with saturated calomel electrode then pH of solution is determined by using equation

a)

$pH=\frac{0.4575-E_{cell}}{0.0591}$

b)

$pH=\frac{-0.4575-E_{cell}}{0.0591}$

c)

$pH=\frac{E_{SCE\left(ox\right)}-E_{Q\left(red\right)}^0-E_{cell}}{0.0591}$

d)

$pH=\frac{E_{SCE\left(ox\right)}-E_{Q\left(red\right)}^0+E_{cell}}{0.0591}$

7.

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

a)

2

b)

4

c)

14

d)

8

8.

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

a)

True

b)

False

9.

The glass electrode can be used in the presence of oxidising and reducing species.

a)

True

b)

False

10.

Determine the pH of the solution if EMF of the cell at

25\degree C

is 0.338 V using saturated calomel as reference electrode. (Given:

E_{SCE\left(ox\right)}=-0.2415

)

a)

1.94

b)

2.45

c)

1.87

d)

1.63

TYBSc Quiz Assignment-3 Electrochemical cell

Total questions: 10

Worksheet time: 9mins

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