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TED(15)1004

FIRST SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY
(Common to all Diploma Programmes except DCP & CABM)
Model Question Paper

Engineering Chemistry – I
(Maximum Marks : 100)

Time : 3 Hrs
PART- A

I
...
Each question carries 2 Marks
a
...
Mention two examples
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Calculate the number of protons and neutrons of the following elements
...
Concentration of hydrogen ion in a cup of black coffee is 1 x 10-5 M/L
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Is the coffee is acidic or alkaline
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Give reasons for temporary and permanent hardness of water
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Give the composition of the following alloys
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Brass
II
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Answer any five full questions
...
i)
...


ii)
...

b
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Define atomic number and mass number
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Explain homogeneous catalysis and heterogeneous catalysis with one example for
each
...
i)
...


ii)
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Write down the relationship between pH and pOH
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i)
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Explain acidic and basic buffers with one example for each
...

e
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Define ionic product of water and give its mathematical equation
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(3)

ii)
...

f
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g
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(4)

Hard water do not form lather with soap
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i
...

iii
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Name the two fundamental particles present in the nucleus of an atom
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(4)
b
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(4)

c
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(4)

i
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Poison

d
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(3)

OR
IV a
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(4)

b
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(4)

c
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(4)

d
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(3)

Module – II
V a
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(4)
b
...


(4)

c
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i
...

iii
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Titration
End point

(3)

d
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281 g of the acid in 200 ml
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(4)
OR
VI a
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8g of potassium hydroxide (KOH) in water to
give 500ml of the solution
...
Also
calculate the pH of the solution
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Mention any four applications of pH
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What are the indicators used in the following titrations
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H2C2O4 x NaOH

iii
...


H2SO4 x Na2CO3

iv
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Define basicity of an acid and acidity of a base
...
Give any four physical properties of water
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How can permanent hardness be removed by ion exchange method
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Distinguish between soft water and hard water
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Give different chemical changes involved in the sterilization of water by bleaching
powder
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What are the disadvantages of hard water?

(4)

b
...

i
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Temporary hardness is boiled
...


(4)

c
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(4)

d
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Which are the three verities of iron? Compare these with respect to their composition and any two physical properties
...
Mention any two advantages and limitations of power metallurgy
...
Explain the preparation of alloys by fusion method with the help of a diagram
...
Name any three impurities of steel and give their effects on its properties
...
Define alloys
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Give any three purposes of
making alloys
...
Explain composition of cast iron and wrought iron with any two properties of
each
...
Define the following steps involved in powder metallurgy
...

ii
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Give any three physical properties of metals

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