STUPIDSID
Choose the correct answers for the following:
1 (a) (i)
A metal rod is dipped in a solution of its ions. Its electrode potential is independent of:
a) Temperature of solution
b) Concentration of solution
c) Area of metal exposed
d) Nature of metal
a) Temperature of solution
b) Concentration of solution
c) Area of metal exposed
d) Nature of metal
1 M
1 (a) (ii)
The emf of a cell consisting of a SHE and a metal is formed to be 0.74V. The SHE is the positive electrode in the combination. Then the potential of the metal electrode is:
a) 0.74V
b) 1.74V
c) 0.37V
d) -0.74V
a) 0.74V
b) 1.74V
c) 0.37V
d) -0.74V
1 M
1 (a) (iii)
Electrode potential of a metal in a dilute solution is:
a) Same as that in a concentrated solution
b) Lower than in concentrated solution
c) Higher than in concentrated solution
d) None of these
a) Same as that in a concentrated solution
b) Lower than in concentrated solution
c) Higher than in concentrated solution
d) None of these
1 M
1 (a) (iv)
The potential of the metal electrodes used in a cell are 0.35V and 0.85V. The emf of the cell formed by combining them is:
a) 1.20V
b) 0.5V
c) -0.50V
d) -1.20V
a) 1.20V
b) 0.5V
c) -0.50V
d) -1.20V
1 M
1 (b)
What are concentration cells? Explain the working of a concentration cell by taking suitable example.
5 M
1 (c)
Explain a method for determination of single electrode potential.
5 M
1 (d)
An electrochemical cell consists of magnesium electrode in 0.042M Mg(NO3)2 solution and silver electrode in 0.35M AgNO3 solution. The SEP of Mg and Ag are -2.363V and +0.80V respectively. Represent the cell. Write the cell reaction and calculate the emf of the cell.
6 M
Choose the correct answers for the following:
2 (a) (i)
In lead acid battery the product formed on both anode and cathode is
a) PbO2
b) PbO
c) PbSO4
d) Pb
a) PbO2
b) PbO
c) PbSO4
d) Pb
1 M
2 (a) (ii)
A battery in which a key component is seperated from the battery prior to its activation is called,
a) Primary battery
b) Secondary battery
c) Tertiary battery
d) Reserve battery
a) Primary battery
b) Secondary battery
c) Tertiary battery
d) Reserve battery
1 M
2 (a) (iii)
In which of these batteries KOH is used as an electrolyte
a) Ni-Cd
b) Ni-MH
c) Zn-air
d) All of these
a) Ni-Cd
b) Ni-MH
c) Zn-air
d) All of these
1 M
2 (a) (iv)
In which of the following batteries the cell reaction is not reversible?
a) Pb-PbO2
b) Li-MnO2
c) Ni-MH
d) Ni-Cd
a) Pb-PbO2
b) Li-MnO2
c) Ni-MH
d) Ni-Cd
1 M
2 (b)
Explain the construction and working of Zn-MnO2 battery.
5 M
2 (c)
What are fuel cells? Describe the construction and working of a CH3OH–O2 fuel cell.
7 M
2 (d)
Write the discharging and charging reactions in the following batteries:
i) Ni-Cd battery
ii) Ni-MH battery
i) Ni-Cd battery
ii) Ni-MH battery
4 M
Choose the correct answers for the following:
3 (a) (i)
When a buried pipeline is protected from corrosion by connecting to magnesium block it is called:
a) Impressed voltage protection
b) Sacrificial cathode protection
c) Sacrificial Anodic protection
d) None of these
a) Impressed voltage protection
b) Sacrificial cathode protection
c) Sacrificial Anodic protection
d) None of these
1 M
3 (a) (ii)
During galvanic corrosion the more noble metal acts as:
a) Anode
b) Cathode
c) Anode as well as cathode
d) None of these
a) Anode
b) Cathode
c) Anode as well as cathode
d) None of these
1 M
3 (a) (iii)
In water line corrosion, the maximum amount of corrosion takes place
a) Along a line just above the level of water meniscus
b) Along a line at the level of water meniscus
c) Along a line just below the level of water meniscus
d) At the bottom of the vessel
a) Along a line just above the level of water meniscus
b) Along a line at the level of water meniscus
c) Along a line just below the level of water meniscus
d) At the bottom of the vessel
1 M
3 (a) (iv)
During differential aeration corrosion, the corrosion:
a) occurs at more oxygenated part
b) occurs at less oxygenated part
c) occurs uniform throughout
d) None of these
a) occurs at more oxygenated part
b) occurs at less oxygenated part
c) occurs uniform throughout
d) None of these
1 M
3 (b)
What is mettalic corrision? Explain the electrochemical theory of corrosion with respect to iron.
6 M
3 (c)
Explain the corrosion control techinque by cathodic protection.
6 M
3 (d)
Explain galvanization process.
4 M
Choose the correct answers for the following:
4 (a) (i)
In chromium plating electrolyte used in the bath solution:
a) H2CrO4+H2SO4
b) K2CrO4
c) HClO4+H2CrO4
d) None of these
a) H2CrO4+H2SO4
b) K2CrO4
c) HClO4+H2CrO4
d) None of these
1 M
4 (a) (ii)
Printed circuit boards are prepared by the process of:
a) Electroplating
b) Electro polishing
c) Electroless plating
d) Electroforming
a) Electroplating
b) Electro polishing
c) Electroless plating
d) Electroforming
1 M
4 (a) (iii)
The ability of the plating bath to develop uniform coating on the entire surface of the object is measured by its:
a) Current Density
b) Decomposition potential
c) Plating power
d) Throwing power
a) Current Density
b) Decomposition potential
c) Plating power
d) Throwing power
1 M
4 (a) (iv)
Polarization effect can be minimized by using:
a) Large electrode surface
b) Highly conducting solution
c) Low electrolyte concentration
d) All of these
a) Large electrode surface
b) Highly conducting solution
c) Low electrolyte concentration
d) All of these
1 M
4 (b)
Explain the terms:
i) Polarization
ii) Decomposition potential
i) Polarization
ii) Decomposition potential
6 M
4 (c)
Explain the following plating variables affect the nature of electro deposit.
i) Current Density
ii) pH
iii) Complexing agent
i) Current Density
ii) pH
iii) Complexing agent
6 M
4 (d)
What is electroless plating? Explain electroless plating of copper.
4 M
Choose the correct answers for the following:
5 (a) (i)
A knocking sound is produced in the internal combustion engine when the fuel:
a) Burns slowly
b) Burns fast
c) Contains rain water
d) None of these
a) Burns slowly
b) Burns fast
c) Contains rain water
d) None of these
1 M
5 (a) (ii)
For good performance, the hydrocarbon molecules in a diesel fuel should be:
a) Straight chained
b) Branched chain
c) Side chained
d) Aromatic
a) Straight chained
b) Branched chain
c) Side chained
d) Aromatic
1 M
5 (a) (iii)
Catalytic cracking of heavy oil is carried out to get better quality
a) Kerosene
b) Diesel
c) Gasoline
d) Lubricating oil
a) Kerosene
b) Diesel
c) Gasoline
d) Lubricating oil
1 M
5 (a) (iv)
Suitability of diesel fuel is determined by:
a) Octane number
b) Propane number
c) Cetane number
d) Butane number
a) Octane number
b) Propane number
c) Cetane number
d) Butane number
1 M
5 (b)
Define calorific value. Explain how calorific value of solid fuel is determined by bomb calorimeter.
7 M
5 (c)
0.78g of coal containing 1.9% hydrogen, when burnt in a bomb calorimeter, increased the temperature of 2.7kg water from 27.2deg;C to 29.7deg;C. If the water equivalent of the calorimeter is 1.2kg, Calculate the gross and net calorific value. (Specific heat of water is 4.187kJ/kg/deg;C, latent heat of steam is 2457 kJ/kg)
5 M
5 (d)
Explain the purification of silicon by zone refining process.
4 M
Choose the correct answers for the following:
6 (a) (i)
For water system the maximum number of degrees of freedom
a) 0
b) 3
c) 2
d) 4
a) 0
b) 3
c) 2
d) 4
1 M
6 (a) (ii)
When lead is progressively added to molten silver, the melting point of the resultant alloy is
a) raised
b) lowered
c) unaltered
d) unpredictable
a) raised
b) lowered
c) unaltered
d) unpredictable
1 M
6 (a) (iii)
Colorimetric analysis is based on
a) Faradays Law
b) Beer-Lambert's Law
c) Ohm's Law
d) Kohlrauen's law
a) Faradays Law
b) Beer-Lambert's Law
c) Ohm's Law
d) Kohlrauen's law
1 M
6 (a) (iv)
In potentiometric titration the platinum electrode acts as:
a) Reference electrode
b) Standard electrode
c) Reduction electrode
d) Indicator electrode
a) Reference electrode
b) Standard electrode
c) Reduction electrode
d) Indicator electrode
1 M
6 (b)
Draw phase diagram of Fe-C system. Explain eutectic and eutectoid point.
6 M
6 (c)
Explain pattinson's process of desilverisation of lead.
4 M
6 (d)
Discuss the theory and instrumentation of potentiometric titration.
6 M
Choose the correct answers for the following:
7 (a) (i)
A plastic which can be softened in heating and hardened on cooling is called
a) thermoplastic
b) thermosetting
c) thermoelastic
d) thermite
a) thermoplastic
b) thermosetting
c) thermoelastic
d) thermite
1 M
7 (a) (ii)
Which of the following is an elastomer
a) PVC
b) Bakelite
c) Nylon
d) Neoprene
a) PVC
b) Bakelite
c) Nylon
d) Neoprene
1 M
7 (a) (iii)
Chloroprene is the repeating unit in:
a) Polystyrene
b) Neoprene
c) PVC
d) Polythene
a) Polystyrene
b) Neoprene
c) PVC
d) Polythene
1 M
7 (a) (iv)
The process of vulcanization makes rubber:
a) Soluble in water
b) Soft
c) Hard
d) More elastic
a) Soluble in water
b) Soft
c) Hard
d) More elastic
1 M
7 (b)
What is glass transition temperature? Explain any three factors that influence the glass transition temperature.
4 M
7 (c)
Explain the manufacture of plastic by compression moulding and injection moulding technique.
6 M
7 (d)
Give the synthesis of
i)Teflon
ii) Neoprene
iii)Polyurethane
i)Teflon
ii) Neoprene
iii)Polyurethane
6 M
Choose the correct answers for the following:
8 (a) (i)
Total alkalinity of water is the sum of
a) OH- and CO32- only
b) OH- ions only
c) CO32- ions only
d) OH-, CO32- and HCO32-
a) OH- and CO32- only
b) OH- ions only
c) CO32- ions only
d) OH-, CO32- and HCO32-
1 M
8 (a) (ii)
The indicator used in the determination of chloride content in water sample by argentometric method is
a) K3[Fe(CN)6]
b) K2CrO4
c) K2[Fe(CN)6]
d) K2CN2O7
a) K3[Fe(CN)6]
b) K2CrO4
c) K2[Fe(CN)6]
d) K2CN2O7
1 M
8 (a) (iii)
Primary treatment of sewage is used to remove:
a) Suspended and floating solids
b) Soluble inorganic solids
c) Pathogenic bacteria
d) All of these
a) Suspended and floating solids
b) Soluble inorganic solids
c) Pathogenic bacteria
d) All of these
1 M
8 (a) (iv)
The reagent used in the estimation of sulphate by gravitimetric method is:
a) Phenol-di-sulphonic acid
b) Barium chloride
c) 2-SPADANS
d) Barium sulphate
a) Phenol-di-sulphonic acid
b) Barium chloride
c) 2-SPADANS
d) Barium sulphate
1 M
8 (b)
Discuss the determination of chloride in water by argentometric method.
6 M
8 (c)
How is alkalinity of water caused? Explain the determination of alkalinity by phenolphthalein indicator.
6 M
8 (d)
Define COD. Explain the sewage treatment of activated sludge process.
4 M
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