H.S.C. Board Practice Question Paper Set B
Date: Sub.: Chemistry (55) Seat Number:
Time: 3Hr. (Physical and Inorganic Chemistry) Marks: 70
Section I
Q. 1. Select and write the most appropriate
answer from the given alternatives for each sub question. [07]
(i) The major binding force in
graphite is
(a) ionic
bond (b) covalent bond
(c) hydrogen
bond (d) London force
(ii) The
two solutions with same osmotic pressure are called
(a) isotonic (b) isomeric
(c) hypotonic (d)
hypertonic
(iii) Which of the following is not an extensive property?
(a) molarity (b) molar heat capacity
(c) mass (d) volume
(iv)The
number of electrons that have a total charge of 965 coulombs is
a) 6.022 X 1023 (b) 6.022 X 1022
(c) 6.022 X 1021 (d) 3.011 X 1023
(v) The rate of a reaction is expressed in the units
(a) L mol-1t-1 (b) mol dm-3t-1
(c) Ms (d) M-1s-1
(vi) Van Arkel method of
purification of metals involves converting the metal to a:
(a)
Volatile compound (b)
Volatile unstable compound
(c)
Non-volatile stable compound (d)
Non-volatile unstable compound
(vii) Iodine can exist in
the oxidation states
(a)
+1,+3,+5 (b) -1,+1,+3
(c) +3,+5,+7 (d) -1,+1,+3,+5,+7
Q. 2. Answer any
SIX of the following. [12]
(i) Explain covalent solids or
network solids.
(ii) Derive a relation between relative lowering of
vapour pressure and molar mass of a non-volatile solute.
(iii) What are the conditions under which ΔH=ΔU?
(iv) Describe the construction and working of the calomel
electrode.
(v) What is pseudo-first order reaction? Give its
examples.
(vi) Explain
electrolytic refining.
(vii) Explain brown ring test to detect nitrate ion.
(viii) Draw the structure
of(a) PCl3 (b)PCl5
Q.3. Answer any
THREE of the following.
[09]
(i) Resistance of
conductivity cell filled with 0.1 M KCl solution is 100Ω. If the resistance of
the same cell when filled with 0.02 M KCl solution is 520Ω, calculate the
conductivity and molar conductivity of 0.02M solution. [Given: Conductivity of
0.1M KCl solution is 1.29 S m-1]
(ii) The concentration of reactant in a first order
reaction A Products, varies with time as follows:|
t/min
|
0
|
10
|
20
|
30
|
40
|
|
[A]/M
|
0.0800
|
0.0536
|
0.0359
|
0.0241
|
0.0161
|
Show that the
reaction is first order.
(iii) Silver crystallises in fcc
structure with edge length of unit cell, 4.07 x 10-8cm and if
density of metallic silver is 10.5 g cm-3. Calculate atomic mass of
silver.
(iv) Explain the
following trends in case of group 16 elements:
(1) Atomic and ionic radii
(2) Ionisation enthalpy
(3) Electronegativity
Q. 4. Answer any ONE
of the following.
[07]
(i) (a) Explain n -type
semiconductors.
(b) State and explain van't Hoff-Avogadro'slaw.
(c) Calculate
standard heat of formation of C2H6 from the following
data:
2C2H6(g)
+ 7O2(g)
4CO2(g) + 6H2O(l),
4CO2(g) + 6H2O(l),
ΔH°= –3119KJ,ΔfH
= –393.5 KJ mol–1, ΔfH
=–285.8 KJ mol–1.
= –393.5 KJ mol–1, ΔfH=–285.8 KJ mol–1.
(ii) (a) How is zone refining process used to obtain
ultra pure metals?
(b) Distinction between order and molecularity.
(c) Calculate the potential of the following
cell at 25°C: Zn | Zn2+(0.6M)
|| H+ (1.2M)
| H2(g,1 atm)
| Pt
E° Zn2+ / Zn = -0.763 V.
Section: II
Q. 5. Select and
write the most appropriate answer from the given alternatives for each sub
question. [07]
(i) Chromyl
chloride test is for
(a) chloride salt (b) nitrate salt
(c) thiosulphate salt (d) sulphate
salt
(ii) Coordinate number of cobalt in [Co(C2O4)3]3-
is
(a) 2 (b) 6 (c) 5
(d) 4
(iii) The number of asymmetric carbon atoms in glucose are
a) 2 b) 3 c) 4 d) 5
(iv) Which of the following compounds is obtained as major
product on reaction of ethoxybenzene with
nitrating mixture?
(a)2 - Nitro ethoxybenzene (b)3 - Nitro ethoxybenzene
(c) 4 - Nitro ethoxybenzene (d)Nitrobenzene
(v) Which is the strongest acid?
(a) CH3COOH (b) CH3CH2COOH
(c) (CH3)3CCOOH (d)
ClCH2COOH
(vi) Identify the compound 'B' in the following series of
reactions
c) n-propyl alcohol
d) Isopropyl alcohol
(vii) A polymer of butadiene and Acrylonitrile is
called,
a) Buna-S b) Buna-N
c) Buna-B d) Buna-A
Q. 6. Answer any
SIX of the following. [12]
(i) Write the different oxidation states of manganese.
Why +2 oxidation state of manganese is more stable?
(ii) Explain the structure of nickel tetracarbonyl on the
basis of valence bond theory.
(iii) (1) What happen when methyl chloride is boiled with
alcoholic solution of potassium.
(2) What happen when silver cyanide is heated with
methyl chloride.
(iv) How will you prepare phenol from cumene.
(v) (1) How will you
prepare acetaldoxime from acetaldehyde.
(2) How will you prepare acetoxime from
acetaldehyde.
(vi) What is the action of bromine in alkaline medium on:
(1) CH3-CH2-NO2.
(2) 2-nitropropane.
(vii) How will you prepare glucose from:
(1) Sucrose
(2) Starch
(viii) Explain the mechanism of
cleansing action of soaps and detergents.
Q.7. Answer any
THREE of the following.
[09]
(i) (1) How will you prepare methyl acetate from methyl
iodide.
(2)
Explain the
mechanism of SN2 reaction with energy profile diagram.
(ii) Write the mechanism of acid catalyzed dehydration of ethanol to give
ethene.
(iii) Write a note on Cannizzaro
reaction.
(iv) Find effective atomic number (EAN) in the following
complexes
(1) [Ni(Co)4]
(2) [Fe(CN)6]4-
(3) [Co(NH3)6]3+
Q. 8. Answer the
following any ONE of the following. [07]
(i) (a) What are the structures of: (1) chromate ion CrO42- and
(2) dichromate
ion, Cr2O72-?
(b) How will you prepare n-propyl amine from pthalimide.
(c) What is peptide linkage? How is peptide linkage
formed in proteins?
(ii) (a) Write the preparation of (1) Buna-S
(2) Buna-N.
(b) Explain any TWO physical
methods for preservation of food.
(c) (1) Write a note on
Fittig reaction.
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