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WorksheetsEC -PET-I
Total questions: 30
Worksheet time: 1hrs 7mins
What are the ions responsible for hardness?
Ca & Mg
Ca & Mn
Na & Ca
Mg & Na
Temporary hardness is due to the presence _________ salts.
Bicarbonates of Ca & Mg
Bicarbonates of Mg
Bicarbonates of Na
Chlorides & Sulphate
Which of the following is Permanent hardness salt?
CaCl2
CaCO3
Mg(HCO3)2
NaCl
Permanent hardness is removed by ________process
Zeolite
Boiling
RO
Demineralization
What is the colour of EBT indicator?
Red
Wine red
Steel blue
Reddish brown
What is Hard water?
Gives lather with soap solution
Prevents lather
Gives yellow precipitate
None of these above
State true or false. Soft water prevents lather with soap
True
False
. CaCl2 + Na2CO3 → ?
CaCl2 + Na2CO3 → CaCO3 +CO2
CaCl2 + Na2CO3 → CaCO3 +NaCl
CaCl2 + Na2CO3 → CaCO3 +2NaCl
CaCl2 + Na2CO3 → CaCO3 +2CO2
Ca(HCO3 )2 + Heat→ ? complete the equation
Ca(HCO3 )2 → CaCO3 +H2O +CO2
Ca(HCO3 )2 → CaCO3 +2H2O +CO2
Ca(HCO3 )2 → CaCO3 +H2O +2CO2
Ca(HCO3 )2 → CaCO3 +2H2O +2CO2
State true or false. Hard water gives wine red colour with EBT indicator.
True
False
What is the unit of hardness?
g/lit
kg
PPM
cm
What is Sludge?
Formation of bubbles
Formation of precipitate
Formation of hard coating
Formation of Slimy & loose precipitate
Which one is sludge forming substance?
CaCl2
Ca(HCO3)2
CaCO3
NaCl
What is Scale?
Formation of bubbles
Formation of precipitate
Formation of Slimy & loose precipitate
Formation of hard adherent coating
Which one is Scale forming substance?
CaSO4
Ca(HCO3)2
CaCO3
NaCl
What is the example of Cation exchanger resin?
Sulphonated coals
Urea formaldehyde resin
Sulphonated polystyrene
Ammonia
What pH range is maintained in EDTA titration?
8-10
2-3
3-5
4-6
What is Softening?
Process of removing common salt
Process of removing hardness salt
Process of removing turbidity
Destroy the bacteria
How is demineralization is carried out?
Using semipermeable membrane
Using Sodium zeolite
Using ion exchange resin
Using boiler compounds
Which statement is correct?
Zeolite removes hardness salt
Zeolite removes common salt
Zeolite removes all the ions
None of these above
What is the formula of Zeolite?
Na2O.Al2O.SiO2.H2O
Na2O.Al2O. XSiO2.YH2O
Na2O.Al2O3.SiO2.H2O
Na2O.Al2O3.XSiO2. YH2O
Which statement is correct?
Demineralized water contain Ca & Mg and Soft water contains Ca & Mg
Demineralized water doesn’t contain Ca & Mg and Hard water contains Ca & Mn
Hard water gives wine red colour with EBT & forms weak complex
None of these above
State true or false. Cation exchanger resin is regenerated by using dil. NaOH
False
True
Which is the correct equation?
Na2-Ze + MgSO4→ Mg-Ze + Na2SO4
Na2-Ze + MgCl2→ Mg-Ze + NaCl
Na2-Ze + CaCl2→ Ca-Ze + NaCl
Ca-Ze + NaCl → Na2-Ze + CaCl2
State true or false. Water containing Fe & Mn cannot be treated by ion exchange process
False
True
Which is used to regenerate anion exchanger resin?
Conc.HCl
dil.HCl
dil.NaOH
NaCl
Which statement is correct?
Sludge can be removed using scraper, wire brush.
If scales are brittle, they can be removed by thermal shocks
If the precipitate is loose and slimy it is called scale
Above all
How to regenerate cation exchanger resin?
Adding dil.KOH
Adding dil.H2SO4
Adding dil.NaOH
Adding NaCl
Find out the permanent hardness salt?
Ca(HCO3)2
CaCl3
NaHCO3
MgSO4
What is the molecular weight of CaCO3?
50
100
150
200
