wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Effect of Added Electrolyte on the rate of reaction

Total questions: 17

Worksheet time: 17mins

Name
Class
Date
1.

Reaction rates can change with

a)

temperature

b)

use of catalyst

c)

ionic strength

d)

All of these

2.

ionic strength of a solution is defined as

a)

12 Σ m12z12\frac{1}{2\ \ }\Sigma\ m_1^2z_1^2

b)

12Σ m1z12\frac{1}{2}\Sigma\ m_1^{ }z_1^2

c)

12Σ m12z1\frac{1}{2}\Sigma\ m_1^2z_1^{ }

d)

12Σ m1z1\frac{1}{2}\Sigma\ m_1^{ }z_1^{ }

3.

 2 KI+K2S2O8I 2 +2K2SO42\ KI+K_2S_2O_8→_{_{_{_{_{_{_{_{ }}}}}}}}I\ _2\ +2K_2SO_4  is an example of 

a)

Acid Base reaction 

b)

Redox Reaction

c)

Complexometric reaction

d)

Precipitation reaction 

4.

Liberated iodine is titrated with Na2S2O3 solution using (a)   indicator .

5.

 I2+2Na2S2O32I+Na2S4O6I_2+2Na_2S_2O_3→2I^−+Na_2S_4O_6  in this reaction, when all the iodine has completely reacted with sodium thiosulphate and starch is added as indicator ,solution appears ______in colour

a)

yellow

b)

brown

c)

blue

d)

colourless

6.

In this experiment the ionic strength of the solution is altered by addition of

a)

KI

b)

K2S2O8

c)

KCl

d)

Starch

7.

Since the concentration of KI/KCL is ___________M which is much _________as compared to concentration of potassium persulphate ,hence the order of the reaction is reduced to one .

a)

0.01M, Higher

b)

0.01M, lower

c)

0.4M,Higher

d)

0.4 M,lower

8.

In the kinetic experiment , ice is added to the conical flask while titrating the reaction mixture with sodium thiosulphate for

a)

cooling the reaction mixture

b)

arresting the rate of reaction

c)

increasing the reaction rate

d)

acting as a catalyst

9.

How will you reduce the waste of reagents during this experiment

4 lines
10.

Which reagents can be recycled after the experiment ?

4 lines
11.

Give an example of chemical waste , non-hazardous waste ,biodegradable waste and recyclable waste during the experiment .

4 lines
12.

when 25mLof 0.01M K2S2O8 is diluted to 125 mL after mixing the two solutions, the effective concentration of K2S2O8 is ___________and is termed as initial concentration a.

a)

0.002

b)

0.0125

c)

0.02

d)

0.00125

13.

What is the concentration of liberated iodine If 5.5 mL of 0.002N Na2S2 O3 solution is required for titration of 10 mL of the reaction mixture ?

a)

11X 10 -4

b)

11X 10 -3

c)

1.01 X 10 -3

d)

1.01 X 10 -4

14.

For graphical determination of the rate constant for both the sets the graph of log (a-x) vs Time is plotted and and determination of K is done by using which of the following equations?

a)

slope

b)

slope X 2,303

c)

slope /2,303

d)

intercept on y axis.

15.

addition of strong electrolyte leads to increase in rate of reaction due to

a)

increase in concentration of KCl

b)

decrease in ionic strength

c)

increase in ionic strength

d)

increase in concentration of Iodine

16.

Increase in ionic strength is expected to increase the rate of reaction between similarly charged ions according to _________ equation.

a)

Nernst equation

b)

Debye-Huckel Equation

c)

Tafel's equation

d)

Kohlrausch's law

17.

2 KI + K2S2O8 → I2 + 2K2 SO4 the rate of this reaction increase by addition of the strong electrolyte KCl because ions involved in the redox reaction has __________ charges and ______ ionic strength.

a)

opposite , increase

b)

like , decrease

c)

opposite decrease

d)

like, increase