Engineering Chemistry SPPU Insem Question Paper Mar 2024
All 4 questions from this SPPU insem paper, as printed. Read them here or open the PDF.
- Subject code
- 107009
- Pattern
- 2019 pattern
- Exam
- Insem
- Session
- Mar 2024
- Max. marks
- 30
- Time
- 1 Hour
- Semester
- II
- Paper code
- [6267]-2
Printed for: F.E. (All Branches) (Insem)
Instructions to the candidates
- Answer Q1 or Q2 and Q3 or Q4.
- Figures to the right indicate full marks.
- Neat diagrams must be drawn wherever necessary.
- Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed.
- Assume suitable data, jf necessary.
Questions
Q1
- a)[5]
Define scales. Explain four causes of deposit formation in boilers.
- b)[4]
Give the ion-exchange and regeneration reactions involved in the deionisation of water containing MgCl 2 .
- c)[3]
Define : i) Permanent hardness ii) Foaming iii) Caustic embrittlement
- d)[3]
25 ml. of hard water sample required 11.2ml of 0.01MEDTA to reach the end-point. 25ml of the same water sample after boiling and filtrations required 7.9ml of the same EDTA to reach the end-point. Calculate total, temporary and permanent hardness of water.
OR- a)
Q2
- a)[5]
Define hardness. Give the structure of Na 2 EDTA. Explain the EDTA method for determination of total hardness of water with reactions and formula.
- b)[4]
What is reverse osmosis? Explain the process of reverse osmosis with figure. 2
- c)[3]
50 ml. of alkaline water required 5.7 ml of 0.02 NHCl to reach the phenolphthalein end-point and further 5.7 ml of the same acid to reach the methyl orange end-point. Calculate the type and amount of alkalinity of water.
- d)[3]
A zeolite bed was exhausted by passing 5100 lit. of hard water. It required 120 lit. of brine containing 15g/lit. of Nacl for regeneration. Calculate the hardness of water.
- a)
Q3
- a)[5]
Explain the three stages of PH metric titration between strong acid and strong base. Give the reaction and draw the titration curve.
- b)[4]
What are ion-selective electrodes? Give the composition of the ISE membrane for determination of F – , Cl – and urea.
- c)[3]
Give construction with neat, labelled diagram and representation of glass electrode.
- d)[3]
Explain the construction of conductivity cell with neat labelled diagram.
Also asked:Oct 2025
OR- a)
Q4
- a)[5]
Explain the three stages of conductometric titration between CH 3 COOH and NH 4 OH with titration curve and reaction.
- b)[4]
Define the following terms : i) Specific conductance ii) Reference electrode iii) Molar conductance iv) Buffer
- c)[3]
Explain why : i) In pH metric titration of HCl against NaOH the pH at equivalence point is 7. ii) In conductometric titration of HCl vs NaOH the conductance decreases rapidly till equivalence point.
- d)[3]
Which electrodes are used in pH metric titration of HCl vs NaOH? Give the procedure for calibration of pH meter.
- a)