WorksheetsTotal Hardness
Total questions: 14
Worksheet time: 7mins
Name
Class
Date
1.
Which Soluble salts of calcium and magnesium are responsible for hardness in water
a)
Bicarbonates
b)
Chlorides
c)
sulphates
d)
All these
2.
Which Soluble salts of calcium and magnesium are responsible for temporary hardness in water
a)
Chlorides
b)
sulphates
c)
Bicarbonates
d)
All these
3.
EDTA donates how many lone pair of electrons
a)
3 lone pairs
b)
4 lone pairs
c)
6 lone pairs
4.
What is EDTA
a)
ethylene diamine tri acetic acid
b)
ethylene amine tetra acetic acid
c)
Ethylene diamine tetra acetic acid
d)
ethene diamine tetra acetic acid
5.
Colour of Metal EBT complex
a)
Blue
b)
Wine red
c)
None
6.
Free form of EBT is
a)
Blue
b)
Wine red
c)
None
7.
The Correct order of the complexes of metal ions with EDTA and EBT in the order of their stability is
a)
Ca-EBT> Ca-EDTA > Mg-EBT
b)
Mg-EDTA > Ca-EDTA > Mg-EBT
c)
Option 3
d)
Mg-EBT> Ca-EDTA > Mg-EDTA
8.
NH4OH- NH4Cl Solution is added
a)
as Buffer
b)
to maintain the pH of the solution
c)
Both
d)
None
9.
What is the primary use of EDTA in analytical chemistry?
a)
Chelating agent
b)
pH buffer
c)
Oxidizing agent
d)
Reducing agent
10.
Which metal ion forms a stable complex with EBT?
a)
Calcium
b)
Iron
c)
Copper
d)
Zinc
11.
What is the effect of hard water on soap?
a)
Increases lathering
b)
Decreases lathering
c)
No effect
d)
Makes soap more effective
12.
What is the role of EDTA in the treatment of heavy metal poisoning?
a)
Oxidizing agent
b)
Reducing agent
c)
Chelating agent
d)
Buffering agent
13.
Which of the following is a common method to soften hard water?
a)
Boiling
b)
Filtration
c)
Ion exchange
d)
Evaporation
14.
What is the color change observed when EBT is used as an indicator in a titration with EDTA?
a)
From blue to pink
b)
From pink to blue
c)
No color change
d)
From green to yellow
100 %
