ICSE CHEMISTRY CLASS 10 PRACTICE PAPER -2
ELECTROLYSIS, HCl, AMMONIA, NITRIC ACID, SUPLHURIC ACID and PRACTICAL CHEMISTRY
Section I (40
Marks)
Answer all the
questions
Question 1
a) Choose the correct answers from the
words given below 5M
(HCl, Ag(NH3)2Cl,
H2SO4, V2O5, N2, O2)
i)
A salt obtained on reaction of a
metallic chloride with Ammonia.
ii) The
gas liberated when Ammonia is passed over heated PbO.
iii) The
acid formed when Conc. HNO3 reacts with Sulphur.
iv) The
catalyst used in the preparation of Sulphur trioxide from SO2 in contact process.
v) A
gas which undergoes ionization completely when dissolved in water.
b)
Match the following. Example- vi-F 5M
Part-A
i) Inert
electrode
ii)
The ions which impart acidic nature to
an
acid
iii)
Emulsifier
iv)
Aqua regia
v)
A non-volatile acid
vi)
A basic gas
Part-B
A)
Hydronium ions
B)
Liquor ammonia
C)
Conc. HNO3 + Conc. HCl
D)
Iron
E)
Conc.HCl
F)
Ammonia
G)
Conc. H2SO4
c) Select the correct answers from the
words given below: 10M
i)
Ni -
2e- à Ni2+ is _______________ reaction.
A)
an oxidation B) a reduction C) Redox D) synthesis
ii)
An active electrode
A)
Iron B) Platinum C) Carbon D) Copper
iii) The
electrolyte used in the electroplating of an article with Silver:
A)
AgNO3 B) Na[Ag(CN)2] C) AgCl2 D) KNO3
iv) Which
of the following cation is reduced most readily:
A)
Mg2+ B)
K1+ C)
Al3+ D) Cu2+
v)
Sodium hydroxide solution is a
__________
A)
strong electrolyte B) weak
electrolyte C) poor electrolyte D) non electrolyte
vi) Which
of the following compounds liberates reddish brown vapours at anode during its
electrolysis?
A)aq.
NiSO4 B) aq.CuSO4 C) PbBr2 fused D) aq. PbBr2
vii) Hydrogen
chloride gas is dried using __________.
A)
Conc. H2SO4 B)
Conc.HNO3 C) CaO D) CaCl2
viii) The
suitable pressure in Haber’s process to prepare Ammonia from Nitrogen and
Hydrogen is:
A)
20atm B) 200-900atm C) 1-2atm D) 10-100atm
ix) The
oxidized product formed when Sulphur is treated with Conc.H2SO4
A)
SO2 B)
S C) SO3 D) H2S
x)
The salt formed when dil.H2SO4
reacts with insufficient Sodium hydroxide:
A)
Na2SO4 B)
NaHSO4 C) MgCl2 D) NaCl
d) Study the picture given and match
A,B,C,D and E with the options given the brackets.
(Copper sulphate, Iron(II) sulphate,
Zinc sulphate, Iron(III) chloride, Lead nitrate) 5M
e) Fill in the blanks:- 5M
i)
Non-polar covalent compounds are
_________ (non/good) electrolytes.
ii) Ammonia
reduces to Chlorine to ____________( Hydrogen chloride/Sodium chloride)
iii) ____________
(Platinum/Iron) is used as a catalyst in the manufacture of Nitric acid by
Ostwald’s process.
iv) HCl
gas is ____________ (lighter/heavier) than air.
v) H2SO4
is a ____________ (deliquescent/hygroscopic) liquid.
f) Correct the following sentences. 5M
i)
In an electrolysis anions migrate to
cathode and cations migrate to anode.
ii) Phenolphthalein
solution changes its colour from Orange to pink on passage of Hydrogen chloride
gas through it.
iii) Ammonium
hydroxide is also known as liquid ammonia.
iv) Nitric
acid is prepared from atmospheric Nitrogen.
v) Conc.
H2SO4 is a reducing agent.
g)
Identify the gases A,B,C,D and E depending on the description given. 5M
i)
Gas ‘A’ rekindles a glowing splint.
ii)
Acidified Potassium dichromate changes its colour from orange to clear green
when gas
B is passed through it.
iii)
When Starch Iodide paper is exposed to gas C, it turns to blue black.
iv)
‘D’is a basic gas which turns Nessler’s reagent to brown.
v)
Gas “E” has rotten egg smell.
Section
II (40 Marks)
Answer
any four of the following questions
Question
2
Answer
the questions a, b and c on the
basis of the electrolysis of Copper sulphate solution using Copper electrodes.
a) i)At
which electrode oxidation reaction takes place
ii)
Write the electrode reactions at anode and cathode.
iii)
The nature of the electrodes is active/inert.
b) i)
Name the pink metal that deposits at cathode.
ii)Give
reason why the colour of the electrolytic solution does not fade in this
electrolysis.
c) i)
Give reason why Copper sulphate is a good electrolyte but Copper is a
nonelectrolyte.
ii)
Define the term Electrolysis.
iii)
What is an inert electrode.
iv)
The amount of electricity flown through an electrolytic solutions depends on
the
concentration/nature
ions.
Question
3
Answer
the questions a, b and c on the
basis of the electrolysis of molten Lead bromide using graphite electrodes.
a) i)
State the observation at anode during the electrolysis of fused PbBr2.
ii)
Write the balanced equation for the electrode reaction at anode.
iii)
Name the products at anode and cathode.
b) Give
reason: i) Lead bromide is taken in fused state
ii) The electrolytic cell is made of silica
iii) Lead bromide is taken in fused state
c) Define
the terms i) Electroplating ii) Electrorefining iii) electrometallurgy.
Question
4
a) Name
the gases evolved when dil.HCl reacts with
i) Metal carbonates ii) Iron sulphide iii) Calcium metal.
b) State
the observations seen when:
i)
Dil. HCl is added to AgNO3 solution
ii)
A glass rod dipped in NH4OH solution is exposed to Conc.HCl
iii)
The clour change in the fountain experiment using HCl gas.
c)
Complete and balance the equations
i)
HCl _____ + ______
ii)
HCl + _______ à
NH4Cl
d)
Give reason why:
i)
HCl is not dried using Quick lime.
ii)
In the preparation of HCl gas from Conc.H2SO4 the
temperature is maintained below 2000C
Question
5
a)
Name the following
i)
The gas produced when Ammonia reacts with excess Chliorine.
ii)
The gas produced when Ammonium salts are heated with an alkali.
iii)
The gas which burns with green flame in the atmosphere of Oxygen.
b)
i) Write the balanced for the preparation of Ammonia by Haber’s process.
ii)
State the catalyst used and the temperature required for the above reaction.
iii)
Which property of Ammonia is proved using fountain experiment.
c)
Give reason why :
i)
Ammonium nitrate is not used in the preparation of Ammonia on heating with an
alkali.
ii)
Ammonia gas is not dried over Conc.H2SO4
iii)
The mixture of Nitrogen and Hydrogen used in the Haber’s process must be from
the
gases
like CO, CO2 , H2S
iv)
Ammonia gas is not collected over water.
Question
6
a)
State the observations seen when
i)
Lead nitrate is heated strongly
ii)
Copper is heated with conc.Nitric acid
b)
i) Complete and balance the following equation
Cu(NO3)2
____ +_____ + ______
ii)
Name the gas released other than NO2 when Conc.HNO3 is
treated with Carbon.
iii)
Name the process by which Sulphuric acid is prepared in large scale.
iv)
Which property of Conc. H2SO4 accounts for its use as a
dehydrating agent.
c)
State the observation seen when Conc.H2SO4 added to:
i)
Sugar crystals.
ii)
Blue hydrated copper sulphate
d)
i) Identify the role played by Conc. Sulphuric acid in the following reaction.
C2H5OH
C2H4
+ H2O
ii)
How do you distinguish dil.H2SO4 from dil. HNO3.
Question7
a) i)State
the change noticed during the electrolysis of aq. Copper sulphate using
platinum electrodes.
ii)
Complete and balance the following equations
b) Give
reasons
i)
Give reason why the electrolysis of acidulated water is considered to be an
example
of
catalyst.
ii)During
the electrolysis of an article with an expensive metal the article is always
made
cathode.
iii)A.C
current should not be passed through an electrolytic solution during the
electrolysis.
iv)
Metals like Na, K and Al are extracted by only electrolysis.
c) i)
Give a balanced equation for the laboratory preparation of HCl gas from Conc.H2SO4.
ii)
State the observation seen when CuS is treated with dil.HCl.
iii)
Name any two gases which can used in the study of Fountain experiment.
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