ICSE PRACTICE PAPER-7 CHEMICAL BONDING, ACIDS, BASES, HCl, AMMONIA, Sulphuric acid
Section I (40
Marks)
Answer all the
questions
Question 1
a) Name the following. 5M
i)
The type of bond formed between Nitrogen and Hydrogen in Ammonia molecule.
ii)
A strong dibasic acid.
iii)
The gas released when Ammonium salts are heated with alkali.
iv)
The explosive liquid formed when ammonia reacts with excess Chlorine gas.
v)
The metallic sulphide which gives a blue filtrate with dil. HCl.
b)
Match the following. Example- vi-D 5M
Part-A
i) Burning
of dry Ammonia in the
atmosphere of Oxygen
ii)
Heating Conc. HCl with MnO2
iii)
Sulphur dioxide
iv)
Nitrogen dioxide
v)
Hydrogen sulphide
vi)
Ammonia
Part-B
A)
Greenish yellow gas
B)
Reddish brown gas
C)
Decolourises acidified KMnO4
D)
Turns moist red litmus to blue
E)
Greenish yellow flame
F)
Rotten egg smell
G)
Sulphuric acid
c) Choose the correct option from
A, B, C and D for each of the following statements. 10M
i)
Covalent compounds have :
A) High
boiling point and High melting point
B) Low
boiling point and High melting point
C) Low
boiling point and Low melting point
D) High
boiling point and Low melting point
ii)
The basicity of Acetic acid
A) 1 B) 2 C)
3 D) 4
iii) Which
of the following statements is not appropriate pertaining to acids
A) Acid produces
Hydronium ions as the only positively charged ions in its solution
B)
Acid produces Hydrogen gas with an active metal
C)
Acids react with salts to produce alkalis
D)
Acids turn moist blue litmus to red
iv) Which
one among the following has four single covalent bonds?
A)
CO2 B)
H2O C)
HCl D) CH4
v)
Which one of the following is not a
base?
A)
Na2O B)
HCl C) Ca(OH)2 D) NH3
vi) The
base which gives a blue filtrate with dil. H2SO4
A)
CuO B) CaO C) KOH D) ZnO
vii) The
drying agent used to purify HCl gas is:
A)
Conc.H2SO4 B)
P2O5 C)
CaO D) CaCl2
viii) The
suitable temperature for the thermal dissociation of HCl gas :
A)
< 5000C B)
> 5000C C)
> 2000C D) 4500C-
5000C
ix) The
catalyst used in the preparation of Ammonia in Haber’s process:
A)
Iron B) Platinum C) Silver D) Nickel
x)
The solution which turns to brown on
passage of Ammonia gas through it:
A)
BaCl2 B)
AgNO3
C)
Nesseler’s reagent D) Ammonium
hydroxide
d) Fill in the blanks:- 5M
i)
An electrovalent bond is formed by the transfer
of electrons from ______________ to ____________
element.(electronegative/electropositive).
ii) _____________
(Ammonia/Hydrogen chloride) gas is released when Magnesium nitride is treated
with warm water.
iii) A
diacidic base can produce two ___________ (Hydronium/Hydroxyl) ions per
molecule.
iv) _____________(FeCl2/FeCl3)
is formed when Iron reacts with HCl gas.
v) Sulphur
reacts with Conc. ____________(HCl/HNO3) to give Sulphuric acid.
e) State your observations when: 5M
i)
Potassium iodide paper is exposed to Nitrogen dioxide gas.
ii)
Sodium sulphide reacts with dil. HCl.
iii)
Dilute HCl is treated with AgNO3 solution.
iv)
Ammonium hydroxide is added to Copper sulphate solution in small amounts then
in
excess.
v)
A glass rod dipped in conc. HCl is exposed to Ammonia gas.
f) Name the gases released in the
following reactions. 5M
i)
Ammonia gas is heated with Oxygen in presence of Platinum as a catalyst.
ii)
Chlorine gas reacts with excess Ammonia gas.
iii)
An active metal is treated with dil. Hydrochloric acid.
iv)
Ammonia gas passed over heated Copper
oxide.
v)
Conc. HCl is heated with MnO2.
g) Select a suitable word from the list
given in brackets for each of the following statements. 5M
(
Reducing agent, Covalent bond, Basicity the acid, alkaline nature, Hydroxyl
ion, Hydronium ions)
i) The
type of bond formed between two identical atoms.
ii) The
number of Hydronium ions produced per molecule of an acid in its aq. solution.
iii) The
ions responsible for the alkaline nature of the alkalis.
iv) The property shown by Ammonia gas when it
reacts with CuO to give Copper metal.
v) Due
to this nature of CaO, it is not used in drying HCl gas.
Section
II (40 Marks)
Answer
any four of the following questions
Question 2 4+2+2+2
a) Draw
the electron structures of the following molecules
i)
N2 iii)O2
ii) CH4 iv) H2O
b) Differentiate
between Polar covalent compounds and Non polar covalent compounds.
c) i)
Electrovalent/Covalent compounds are good conductors of electricity.
ii) Electrovalent compounds contain
___________(molecules only/ions and molecules/ ions only).
d) Classify the following as Oxidation/Reduction
i) Na
– e- Ã Na +
ii) O
+ 2e- Ã O2-
Question 3 4+3+3
a) Name
the following.
i)
The positively charged ion produced when
an acid is dissolved in water.
ii) The
acid used in eye wash.
iii) A
non volatile acid which displaces a volatile acid from its salt.
iv) The
non-metallic oxide which produces Sulphuric acid with water.
b) Write
balanced equations for the following conversions.
i)
Na2O --> NaOH
ii) P2O5 --> H3PO4
iii) Pb(NO3)2 --> PbO
c) i)
A strong acid undergoes complete/partial
dissociation to give a high concentration of Hydronium ions.
ii) ___________ (MgO/Mg(OH)2) is used as
an antacid.
iii) Acidity of Calcium hydroxide is ______(1/2).
Question 4 4+2+4
a) Answer
the followingquestions pertaining to the laboratory preparation of HCl gas.
i)
Nature gas is prepared in this method?
ii)
Name the reactants taken in the Round
bottom flask.
iii) What
is the importance of the liquid ‘X’ in this process?
b) Give
reason
i) Conc.
Nitric acid is not preferred to conc. H2SO4 in the
laboratory preparation of HCl gas.
ii) Special
funnel arrangement is used to prepare Hydrochloric acid.
c) i)
Write balanced equation for the preparation of Hydrogen chloride gas in
laboratory.
ii) Name the gas released when dil. HCl reacts with Sodium thio
sulphate
iii) State the required condition for the following reaction.
H2 + Cl2 --> 2HCl
iv) Which property of HCl
gas is proved by fountain experiment?
Question
5 4+2+2+2
Answer
the following questions regarding the laboratory preparation of Ammonia gas
from
Ammonium salt and alkali
a)
i) Name the reactants taken in the preparation.
ii)
Which method is used to collect Ammonia gas?
iii)State
the identification test for Ammonia gas.
b)
Give reason why:
i) Round bottom flask is kept in inclined
position.
ii)
Conc.H2SO4 is not used to dry Ammonia gas.
c)
Write the balanced equation for Ammonia gas in Haber’s process . State the
catalyst and
conditions
required.
d)
State your observation when:
i)
Dry Ammonia gas burns in the atmosphere of Oxygen
ii)
Ammonia gas is passed through Nesseler’s reagent.
Question
6 5+3+2
a)
i) Write the balanced equation for the oxidation of Sulphur dioxide in contact process
with
conditions required.
ii)
Name the acid formed when the product obtained in the above reaction is
absorbed in
Conc.
H2SO4
iii)
Name the gas released when Conc.H2SO4 reacts with Copper
metal.
b)
i) Give reason why Sulphuric acid can
form to types of salts.
ii)
State your observation when Conc. Sulphuric acid is added to blue hydrated
copper sulphate.
c)
State the role of Sulphuric acid in the following reeactions
i)
NaNO3 + Conc. H2SO4 -->
ii)
S + Conc. 2H2SO4 --> 3 SO2 + 2H2O
iii)
C6H12O6 -->
iv)
dil. H2SO4 + 2NaOH --> Na2SO4
+ 2H2O
Question7
4+4+2
a) Distinguish
the following pairs of compounds.
i) dil. HCl and dil. H2SO4
(using BaCl2 solotuion)
ii) CuSO4
and ZnSO4 (using NH4OH sol.)
iii) CO2 and
H2S (using acidified KMnO4)
b) i)
Name one acid salt of Sulphuric acid
ii) State the composition of Aqua regia and its
importance.
iii) Write the balanced equation for the reduction
of Lead oxide using Ammonia gas.
c) Correct
and rewrite the following statements.
i) Sulphuric acid is a strong oxidizing agent.
ii)
dil. HCl reacts with metal sulphites to give Hydrogen sulphide gas.
iii)
Ammonia gas dissolved in water is called liquid ammonia.
iv)
Hydrogen gas turns alkaline Pyrogallol
to brown.
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