Chemistry - Jun 2014

First Year Engineering (Semester 2)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

Solve any one question from Q1 (a), (b) & Q1 (c), (d)

1 (a) 1 The nucleus of an atom consists of A) electrons and neutrons.
B) electrons and protons
C) protons and neutrons
D) All of the above(1 marks) 1 (a) 10 Which acid is present in lemon?
A) Marlic acid
B) Citric acid
C) Lactic acid
D) Tartaric acid(1 marks) 1 (a) 11 Which metal is heaviest?
A) Osmium
B) Mercury
C) Iron
D)
Nickle(1 marks) 1 (a) 12 Nail polish remover contains?
A) Benzene
B) Acetic acid
C) Acetone
D) Petroleum ether(1 marks) 1 (a) 13 pH of blood is ? A) 10.4
B) 9
C) 7.4
D) 4(1 marks) 1 (a) 14 Biogas majorly contains?
A) Ethane
B) Methane
C) Hydrogen
D) CO(1 marks) 1 (a) 2 The number of moles of solute present in 1 kg of a solvent is called its
A) molality
B) molarity
C) normality
D) formality(1 marks) 1 (a) 3 The most commonly used bleaching agent is
A) alcohol
B) carbon dioxide
C) chlorine
D) sodium chlorine(1 marks) 1 (a) 4 Give IUPAC nomenclature for following compounds. BrCH₂-CH₂-CH₂-CH₂COOH
A) 1-bromo 5- pentanoic acid
B) 4-bromo 1-carboxylic acid butane
C) 5-bromo pentanoic acid
D) none of above(1 marks) 1 (a) 5 10 ppm = ______ °Fr
A) 5 B) 10 C) 1 D) 0.7(1 marks) 1 (a) 6 What happens when hard water was used in Boiler?
A) Boiler corrosion
B) Scale and sludge
C) Priming and forming
D) All of above.(1 marks) 1 (a) 7 Write chemical formula for Potassium chromate.
A) KmnO₄
B) K₂CrO₄
C) K₂Cr₂O₇
D) None of above.(1 marks) 1 (a) 8 The material which can be deformed permanently by heat and pressure is called a
A) Thermoplastic
B) Thermoset
C) Chemical compound
D) Polymer(1 marks) 1 (a) 9 The method that cannot be used for removing permanent hardness of water is
A) Adding sodium carbonate
B) Distillation
C) Adding caustic soda
D) Boiling(1 marks) 2 (a) Write short note on
1. Purposes of Alloy making.
2. Give any one method for Desalination of Brackish water(7 marks) 2 (b) A Sample of water on analysis was found to contain the following impurities:
Ca(HCO₃)₂=32.4 mg/L, Mg(HCO₃)₂=14.6 mg/L, CaSO₄=6.8 mg/L, MgSO₄=6.0 mg/L. Calculate temporary, permanent and total hardness in ppm, °CI and °Fr.[Molecular Mass: Ca(HCO₃)₂=162 m/mole, Mg(HCO₃)₂=146 g/mole, CaSO₄=136 g/mole, MgSO₄=120.](7 marks) 3 (a) Describe the mechanism of Electrochemical corrosion by hydrogen evolution and oxygen absorption.(7 marks) 3 (b) Give monomers of Nylon 6, 6 and Bakelite. Differentiate between Thermoplastic and Thermosetting polymers(7 marks) 4 (a) What is Corrosion? Differentiate between Dry and Wet corrosion.(7 marks) 4 (b) What is CNG? Give advantages and disadvantages of Gaseous Fuel.(7 marks) 5 (a) Explain Setting and Hardening process of Portland cement.(7 marks) 5 (b) Enlist disadvantages of Natural Rubber. Explain Vulcanization process of Rubber.(7 marks) 6 (a) What is the composition of Portland Cement? Discuss the manufacturing process of Portland cement.(7 marks) 6 (b) What are the significances of Biogas? Give manufacturing process of Biogas.(7 marks) 7 (a) Describe Manufacturing process of Acetic acid by fermentation(7 marks) 7 (b) Write a short note on.
1. Natural & Artificial Abrasive.
2. pH & its measurement.(7 marks)