17103
*17103*
21415
2 Hours/50 Marks
S
e
a
t
N
o
.
Instructions : (1) All questions are compulsory.
(2) Illustrate your answers with neat sketches wherever
necessary.
(3) Figures to the right indicate full marks.
(4) Assume suitable data, if necessary.
(5) Preferably, write the answers in sequential order.
MARKS
1. Attempt any nine of the following :
18
a) Distinguish between energy level and subenergy level. (any two points)
b) Give two applications of carbon and cobalt isotopes.
c) Define electrovalency and covalency.
d) Define conductor and give two examples.
e) Distinguish between strong electrolyte and weak electrolyte.
f) Define ECE. State the relation between ECE and CE.
g) Why blue colour of copper sulphate solution turns to colourless after its
electrolysis using platinum electrodes ?
h) Why all ores are minerals but all minerals are not ores ? Explain with example.
i) Give two purposes of making an alloy.
j) Give composition of Woods metal
k) Define Pigment and give two examples.
l) Write two drawbacks of natural rubber.
2. Attempt any four of the following :
16
a) Write orbital electronic configuration of 9F19, 15P31, 24Cr52, 20Ca40.
b) Describe the formation MgO molecule with diagram and name the type of
bonding.
c) If atomic number and atomic mass number of an element is 11 and 23
resp. Write number of protons, neutrons and electrons each.
P.T.O.
17103
*17103*
MARKS
d) Explain Faraday’s first law of electrolysis and derived its mathematical
expression.
e) Give any four assumptions of Arrhenius theory of ionisation.
f) Explain with neat diagram the process of electroplating of silver.
3. Attempt any four of the following :
a) Define Tensile strength, Machinability Soldering and Castability.
b) Name and explain the process used for concentration of Zns ore.
c) Define alloy. Explain Fusion method of preparation of alloy.
d) Distinguish between thermosoftening and thermosetting plastics.
e) What is vulcanisation of rubber ? Explain why it is necessary ?
f) Define Thermocole. Explain its preparation, properties and application.
_________________
16
17103
13141
2 Hours / 50 Marks
Instructions –
Seat No.
(1) All Questions are Compulsory.
(2) Illustrate your answers with neat sketches wherever
necessary.
(3) Figures to the right indicate full marks.
(4) Assume suitable data, if necessary.
(5) Preferably, write the answers in sequential order.
Marks
1.
Attempt any NINE of the following:
18
a) Why an atom is electrically neutral ?
b) State Aufbau principle.
c) If atomic and atomic mass number of an element is 11 and 23
respectively. Write the number of protons, neutrons and electrons.
d) Define pH. What is the pH of extremely acidic and extremely
alkaline solution.
e) State any two points of Arrhenius theory of ionization.
f)
State Faraday’s second law of electrolysis.
g) Calculate the pH value of a solution having hydrogen ion
concentration 1 × 10–4 gm ions per liter.
h) Define the term Metallurgy.
i)
Write composition of Duralumin.
j)
Define alloy. Give one example of ferrous and non-ferrous
alloy.
k) Define plastics and write two examples of Thermosoftening
plastic.
l)
Write chemical unit and structure of rubber.
P.T.O.
17103
[2]
Marks
2.
Attempt any FOUR of the following:
16
a) Write electronic configuration of
12
C
6
40
,
Ca ,
20
16
24
O ,
Mg
8
12
b) Describe formation of Mgo molecule with diagram and name
the type of bonding.
c) Differentiate between electrovalent and covalent bond.
d) Describe electrolysis of CuSO4 solution using platinum
electrodes.
e) Describe electro refining of copper with suitable diagram.
f)
3.
A current of 3 amperes passing through silver nitrate solution
for 20 minutes deposit 4.09 gms of silver, what is the E.C.E.
and C.E. of silver.
Attempt any FOUR of the following:
a) Distinguish between Calcination and Roasting.
b) Define Tensile Strength, Hardness, Weldability and
Machinability.
c) Describe Fusion method of preparation of Alloy.
d) Describe Thermosetting plastic with example. Write
characteristics of Thermosetting plastic.
e) What is natural rubber ? Write drawbacks of it.
f)
Describe how glass wool is prepared ? Write properties and
applications of it.
16
17103
13141
2 Hours / 50 Marks
17103
14115
2 Hours / 50 Marks
Seat No.
Instructions : (1) All Questions are compulsory.
(2) Illustrate your answers with neat sketches wherever necessary.
(3) Figures to the right indicate full marks.
(4) Assume suitable data, if necessary.
Marks
1.
Attempt any NINE of the following :
2 × 9 = 18
(a)
Define Orbit and Orbital.
(b)
State the number of sub-shells in K, L, M, N shells.
(c)
State Hund’s rule of maximum multiplicity.
(d)
State any two points of Arrhenious theory of ionization.
(e)
Define degree of Ionization. Name the factors affecting degree of
Ionization.
(f)
Differentiate between strong eletrolytes & weak electrolytes.
(g)
Calculate the pH of a solution which contains 1.54 × 10–2 mole/lit of
strong acid.
(h)
Define the terms : Tensile strength, Ductility.
(i)
Write the two purposes of making alloys with one example each.
(j)
Define flux and slag.
(k)
Give four examples of synthetic rubber.
(l)
Write two applications of thermosetting plastics.
P.T.O.
17103
2.
3.
[2]
Attempt any FOUR of the following :
4 × 4 = 16
(a)
Define atom & state fundamental particles of an atom with their
properties.
(b)
State Aufbau principle. Write electronic configuration of 19K39, 11Na23
(c)
Describe the formation of CaCl2 with diagram and predict valency of Ca
and Cl.
(d)
State Faraday’s laws of electrolysis.
(e)
Describe with labelled diagram the process of electroplating of silver.
(f)
A given quantity of electricity is passed through two cells containing
CuSO4 and AgNO3 solutions respectively. If 0.99 gm of silver and 0.29
gm of copper are deposited, find the equivalent weight of silver when
that of copper is 31.6.
Attempt any FOUR of the following :
4 × 4 = 16
(a)
With the help of figure explain the Froth Floatation process.
(b)
Differentiate calcination and roasting.
(c)
Give the composition, properties and applications of Babbit metal.
(d)
Define polymerization. Explain addition polymerization with at least one
example.
(e)
Define abrasion resistance. Write two uses of rubber depending upon it.
(f)
Write the properties and applications of thermocole.
___________
4=16
_-:.
.. '
em
a
to
21213-':"
.....
2 Hours / 50 Marks
Seat No.
I " l I I.',
rI
'. . .. Instr~ctidns-: :flY" -AllQuestions.are eompulsory: .
'. (2) 'Illustrate
..,:,;.
'.
'
,
.'
.... : :"
y6u~answers with neat ~ketche~Wherever necessary.
•. :
..
.,..
..:.
':
"'Q'~.
. (3) Figures to the right indicate full marks ..
mx
(4) Assume suitable data, if necessary .
. the
(5) Preferably, write the answers in sequential order.
Marks
.~x 4 = 1
IS'
'e
of
·;tate
'Attempt any NlNE of the following: .
(a)
ieral
x
1.
Why is an atom electrically neutral?
. (b). Calculate .the·atomic number and ..mass number of an atom containing, 20 ..
electrons and 20 neutrons.
..
Why sodium is electropositive O? Explain with' electronic configuration ..
(d)
Distinguish between metallic and electrolytic conduction .
.'
(e). Write the two points
the
with
cm.,
18
ec)
.
.
of Arrhenius
theory' of ionization.
.
(f)
State the relation. between .chemical .equivalent. and electrochemical
equivalent.
(g)
Calculate' the' pH value, .value. of solution' having .hydrogen'
concentration 1';><lO-~.gm ions' per liter.
IOn
(h) Allminerals are notore but all ores' are minerals. Explain.
(i)' When Alloy is cailed amalgam? Give two examples.
.I
.t~
.b
(j)
Why wood metal is used in electric fuses?
(k)
Name the type of plastic with one example
(I)
State four characteristics of good thermal insulating material.
.
of each.
P.T.O.
'..
.
\
\
"
. [2]
17103
2.
. Attempt any FOtJRof~he following :
..
(a)
Give four assumptions of Bohr's' Atomic Theory.
(b)
With the help. offigure explain the formation
(c)
Write orbital configuration of following' elements :
. )3A l
27., 20Ca.40 '7
'N14
,
(d)
-.r
16
.
(e)
. . S32
)19
.....
........
.'.
:- f· " _,'
"
'.'
,
.
..:..'
.
Explain the mechanism of electrolysis of ·CUSO~.by .us·in~·platinum
. electrodes. Write the-products ofelectrolysis ..
Define. degree of ionization .. Explain
ionization.
.
(f)
of NaCl.·
factors affecting degree
"
of
.
A current of 0.4 amperes was passed through a solution ofCu'S04 for·
. .
.
- one hour: Find out the weight of copper deposited on the cathode.
(electrochemical equivalent 'or'copper = 0,00.0326)
.'
-
3.
Attempt any FOlIE. of the following:
16
..
, '. (a) .. Define. the . term
Ma·chinabilit)r.·
..
• I
..,(b)
..( c)
tructility;.· .Tensile Strengt~;. Weldability
.
.and·
Explain with. diagram the method used for the concentration of sulphide
ore.
....
.
Give the. composition, properties 'and uses of duralumin '.
I ..
.(d). . Write four properties 'and related. applications of plastics.
(e).
Give the difference. between natural and synthetic rubber:' .
Cf)
What is glass wool ? Write' two uses of glass wooi. based on its
properti es:
.....
.
17103
*17103*
21314
2 Hours/50 Marks
Instructions :
Seat No.
(1) All questions are compulsory.
(2) Answer each next main question on a new page.
(3) Illustrate your answers with neat sketches wherever
necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
MARKS
1. Attempt any nine of the following :
18
a) Define atom. Name the sub atomic particles.
b) State the number of subshells in K, L, M, N shells.
c) Why chlorine is electronegative ? What type of valency it will show with
hydrogen ?
d) Differentiate between strong and weak electrolyte.
e) What is the affect of temperature on degree of dissociation ?
f) Define electrochemical equivalent. Give its unit.
g) A solution has pH = 6.45. Calculate the hydrogen ion concentration.
h) Differentiate between calcination and roasting.
i) Define Alloy. Name two methods of preparing alloy.
j) Why Duralumin sheets are used in making aeroplanes body ?
k) Name four synthetic rubber.
l) Write two properties of glass wool and its uses related to the property.
2. Attempt any four of the following :
16
a) Write four postulates of Bohr’s atomic theory.
b) Name the type of bonding in water molecule and explain its formation.
c) Write the orbital electronic configuration of the following elements :
39
i) K 19
ii) Cr
52
24
iii) Ne
20
10
32
iv) S16
P.T.O.
*17103*
17103
MARKS
d) Explain the process of electroplating of an iron spoon with silver.
e) Define electrolytic dissociation. State Arrhenius theory of electrolytic
dissociation.
f) A current of 2.5 amperes is passed through a solution of Silver Nitrate for half
an hour. What is the mass of silver deposited on the cathode ? (Given
equivalent weight of Ag = 108.)
3. Attempt any four of the following :
a) Define the term :
i) Tensile strength
ii) Hardness
iii) Ductility
iv) Soldering.
b) Explain with diagram electromagnetic separation method.
c) Give the composition, properties and uses of babbitt metal.
d) Give four properties and its related application of Rubber.
e) Differentiate between thermosoftening and thermosetting plastics.
f) How is thermacole prepared ? Write the two uses and two properties of
thermacole.
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16