TED(10)-1003 B Reg No..................
(REVISION-2010) Signature...............
FIRST SEMESTER DIPLOMA EXAMINATION IN ENGINEERING
TECHNOLOGY-OCTOBER,2011
APPLIED SCIENCE-1 (Chemistry)
(Common except DCP and CABM)
[Time:11/2 hours]
(Maximum marks:50)
PART-A
(Maximum marks: 4) Marks
I) answer the following questions in one or two sentences. Each question carries 2 marks.
(a)Write down the molecular formula of (2)
1) Aluminium phosphate 2) Ammonium carbonate
(b)Mention plasma process (2)
(2x2=4)
Answers
I) a)
1) Al3(PO4)3
= Al( PO4)
2) (NH4)2(CO3)
b) Plasma Process: Here CH4 Is passed through a plasma Torch (ie; high temperature
producing substance).So that C-H bond breaks from 'c' atom binds with other 'c'
atoms from nano tube lattice.
PART-B
(Maximum marks:16)
(Answer any two full questions. Each question carries 8 marks)
II)
(a) Explain the terms
1) symbol 2) molecular formula 4
(b)Define equivalent weight of bases and acids .Calculate the equivalent weight of
i) Sulphuric acid ii) calcium hydroxide (4)
III)
(a) How do water become hard? Define degree of hardness. 4
(b)Explain the application of carbon nano materials in medicine 4
IV)
a) Account for the following 4
(i) pH of the blood remain constant
(ii) When acid is added to water pH value of water decreases?
b) Calculate the normality of HCl which contains 2.281g of the acid in 200ml. find out
the volume of this solution required to neutralize exactly 50ml of 0.12 N sodium hydroxide
solution? (4)
Answers
II)
a)
i)Symbol =Short hand representation of an element eg: Hydrogen =H
ii) Molecular formula(MF):
Actual number of various elements in a molecular or symbolic representation of a
molecule eg: for water is H2O
b) Equivalent weight of acid=
For H2SO4 it is =
=98/2
= 49
Equivalent weight of BASE =
For Ca(OH)2 It is =
=74/2
=37
III)
a) It is due to presence of dissolved impurities like HCO3-, Cl- & SO42- of Ca and Mg. It
Form insoluble scum with soap. There are two types
1) Temporary Hardness:- It is due to HCO3- of Ca and Mg.
2) Permanent Hardness:- It is due to Cl-, SO42- of Ca and Mg.
Degree of Hardness:
It is the number of parts by weight of CaCO3 present in one million (106)
parts by weights of water. Unit= PPM (Parts Per Million)
b) 1. Act as molecular type test-tube and capsule for drug delivery
2. As a tips for analysis of DNA and proteins by a atomic force microscopy.
3. Can detect and locate tumors accurately.
4. Nano shell attaching only to cancer shell and destroy tumor
5. Can deliver right amount of medicine to exact spot of the body using nano
technology.
IV)
a)
(i) Because Blood is buffer or due to combined action of HCO3-/CO32+ buffer
(ii) When acid is added to water ,H+ ion concentration increases this cause
decrease in pH of water
b) N = =
=
=0.312N
N1=0.312 V1=? N2= 0.12 V2= 50ml
There for V1 =
= 19.23 ml
PART -C
(Maximum marks : 30)
(Answer one full question from each unit. Each question carries 15 marks)
UNIT-1
V)
(a) What are radicals? Classify them with two examples for each type 4
(b)Balance the following equation: (4)
(i) KMnO4 + HCl KCl + MnCl2 + H2O +Cl2
(ii) Fe+H2O Fe2O3+H2
(c) Calculate the oxidation number of manganese in any tow compounds and in
one radical. 3
(d)Explain redox reaction taking a suitable example. mention different concept also.(4)
OR
VI)
(a) Define ionic product of water. How will you arrive its value? (3)
(b) A solution is prepared by dissolving 0.49 of NaOH in 500 ml .What is the pH of the
solution? (4)
(c)What is mean by indicator range? Give two example. (4)
(d) How many moles how many grams of sodium chloride are present in 250ml of
0.25 M NaCl solution ? 4
Answers
V)
a) Charged atom or atom groups are called Radical Ex: NH4+, Cl- etc. Radicals are classified as
shown below
Radical
Positively charged/Cations Negatively charged/Anions
Mono Di Tri Mono Di Tri
Ex: NH4+ Ca2+ Al3+
NO3- CO32- PO43-
b)
(i) 2KMnO4 + 16HCl 2 KCl + 2MnCl2 +8H2O +5Cl 2
(ii) 2Fe+3H2O Fe2O3+3H2
x -2 +1 x -2 x 2- 1-
c) Mn O2 K Mn O4 (Mn O4 )
X – 4= 0 (+1)+ X – 8=0 X –8=-1
X=+4 X=+7 X=+7
d) Redox reaction:
Oxidation and reduction together is known as redox reaction eg: Daniel cell(Zn-Cu
galvanic cell)
2+
Ie Zn Zn +2e (Oxidation) …..(1)
2+
Cu + 2e Cu (reduction)………….(2)
2+ 2+
(1)+(2)= Zn + Cu Zn + Cu
Oxidation: Losing of electron is known as Oxidation. During Oxidation , Oxidation
2+
number increases eg: Zn Zn +2e
Reduction: Gaining of electrons is called reduction. During reduction, Oxidation
2+
number decreases eg: Cu + 2e Cu
OR
VI)
a) Ionic product of water [Kw] is the product of concentration of H+ and OH- ions in
water.
It was experimentally found that at 250C , [H+]=[OH-]=10-7 mol/liter.
So Kw =10-7 x 10-7 mol/liter at 250C
OR
Kw = 10-14 mol2/liter2
b) M=
=
=0.0245 mol/L
-
=[OH ]
-14 -
So [H+]= 10 / [OH ]
-14
= 10 / 0.0245
-13
=4.08 10
pH = -log [H+]
-13
=-log[4.08 10 ]
=12.38
c) Indicator range: it is the range of pH in which an indicator changes the colour
methyl orange 3.1 to 4.5
Phenolphthalein 8.3 to 10
d) we have M =
or
W2=
=3.65g
no. of moles =W2/M2
=3.65/58.5
=0 .0623
UNIT-II
VII)
(a) What are the advantage and disadvantage of soft and hard water? (4)
(b) Describe two methords of synthesis of carbon nano tube (4)
(c) Explain different types of filtration used in water treatment (4)
(d) Give any tree application of carbon nano tube (3)
OR
VIII)
(a)Explain different methods of used for the removal of hardness in water. (4)
(b) What are the properties of carbon nano tubes? (3)
(c)Give four characteristics of portable water. Draw a flow chat for the production of
portable water for municipal supply. (4)
(d) What are carbon nano tube?Comment on its structure. (4)
Answers
VII)
a)
SOFT WATER HARD WATER
Gives lather readily with Gives lather readily with soap .it
soap contain dissolved impurities like
Advantage: 3- - 2-
Used for HCO ,Cl ,SO4 ,Ca and Mg
Cooking Advantage:
Bathing
In boiler Form insoluble scum with
In laundry purpose soap
2+ 2+
etc Contain Ca ,Mg ions
Disadvantage: required for health
It dissolves Pb of Disadvantage:
lead pipe which Not Used for
cause poisness Cooking
Do not contain Bathing
2+ 2+
Ca ,Mg ions In boiler
required for health In laundry purpose etc
b)
a) High pressure Carbon Monoxide Deposition Method (HiPCO):
CO(g)&atoms of iron cluster are heated in a chamber at high pressure. So that Fe
breaks the CO molecules as C&O2 by acting as a catalyst. This ‘C’ atom bind with
other ‘C’ atoms form nanotube lattice. O2 react with unburnt CO form CO2
b) Chemical Vapor deposition Method (CVD): Here CH4 is heated in a
chamber containing Fe as catalyst at high temperature. So that C-H bond breaks
from ‘C’ atom. This ‘C’ atom binds with other ‘C’ atoms form nano tube lattice
c) Filtration: Used to remove colloidal and bacterial impurities from water. These are
1. Operation of gravity sand filter method:
It is done as shown below
2. Operation of pressure filter method:
Here filtering medium is essentially same as above. Filtering materials
is kept in a closed cylinder and water is forced into filter under pressure. It is
used for hot water, require less space.
d) i) It strengthen composite material. ii) Act as a molecular size test tube& capsules
for drug delivary. iii) Can act as conductor & semiconductor based on their size. iv)
As a tips for analysis of DNA &Proteins by Atomic force Microscopy.
OR
VIII)
a) Different type of hardness are
Temporary hardness: It is due to HCO3 of Ca and Mg. it can be removed by
boiling.
M(HCO3)2 MCO3 + H2O+ CO2 M= Ca/Mg
-
Permanent hardness: It is due to Cl , SO42-,Ca and Mg. It can be removed by using
synthetic resins like Cation exchanger [E-H+] or anion exchanger [E-OH-] as shown
below
Step 1:
Hard water passed through a tank containing [E-H+] so the following occur
2 E-H+ + Ca2+ E2Ca + 2H+
Step 2:
This water coming out of cation exchanger is then passed through anion exchanger
[E-OH-]
ie E-OH- + Cl- ECl + OH-
and H+ + OH- H2O
b) 1.Very strong
2. High tensile strength & thermal conductivity
3.High Young’s modulus ( force required to bent a material)
4. High electrical conductivity
c) Portable water: Water which safe to drink. it is need not be pure like distilled
water.
Characteristics:
1)It should be clear and odourless
2)it should free from micro organism like bacteria etc..
3)it should free from dissolved gases like H2S, CO2 and minerals like NO31- ,NO21—etc
Screening
Sedimentation
Coagulation
Filtration
Sterilization
Potable water
d) Its structure seemed to be formed by rolling the sheet of graphite in to the shape
of cylindrical tube either closed or open at the end.
Two varieties of CNT are SWNT (Single Walled Carbon Nano Tube. It is like a single
cylinder) and MWNT (multi Wallled Carbon Nano Tube. It contains multiple
concentric nano tube cylinder)
Based on orientation of lattice, nano tubes are classified in to three types
1) Arm Chair
2)Zig Zag
3)Chiral
