Chapter 10 : Study of Sulphur Compound: Sulphuric Acid - Frank Solutions for Class 10 Chemistry ICSE
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Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 249
Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 250
Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 251
Choose the current answer from the options given below :
(i) In the preparation of H2SO4 by contact process V2O3 is used as a catalyst in the reaction. It is
(a) S + O2→ SO2
(b) SO2 + H2SO4→ H2S2O7
(c) SO3 + H2O → H2SO4
(d) 2SO2 + O2→ 2SO3
(ii) When conc. H2SO4 comes in contact with sugar, it becomes black due to
(iii) Which of the following gas dissolves in H2SO4 to give alum?
(iv) In the contact process, the impurities of arsenic are removed by
(v) The catalyst used for the oxidation of SO2 to SO3 in contact process is
(a) Finally divided iron
(d) Nitric oxide
(i) 2SO2 + O2→ 2SO3
(v) Vanadium pentoxide
Fill in the blank with appropriate word/words :
(i) The catalyst used in contact process for the manufacture of H2SO4 is platinum or Vanadium pentoxide
(ii) For the reaction SO2 + O2⇌ SO3 + Heat, the favorable conditions are high pressure and low temperature
(iii) Oil of Vitriol is ___________
(i) The catalyst used in contact process for the manufacture of H2SO4 is ___________ or _________.
(ii) For the reaction SO2 + O2⇌ SO3 + Heat, the favourable conditions are _________ and __________.
(iii) Oil of vitriol is sulphuric acid.
Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 252
Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 253
Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 254
Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 255
Write the equation for each of the following reactions :
(i) Sulphur is heated with concentrated sulphuric acid
(ii) Concentrated sulphuric acid is poured over sugar
(i) S + H2SO4→ 3SO2 + 2H2O
State your observation for the following cases :
(i) Moist blue litmus is introduced into a gas jar of sulphur dioxide
(ii) Dry red rose petals are placed in the jar of sulphur dioxide
(iii) Paper soaked in potassium permanganate solution is introduced into a gas jar of sulphur diaoxide.
(i) Litmus turns blue to red, and then gets bleached.
(ii) Dry SO2 has no effect on dry red rose petals.
(iii) Paper turns from pink to white.
What would you observe in the following case :
Sugar crystals are added to hard glass test tube containing concentrated sulphuric acid.
Charring of sugar takes place. Sulphuric acid dehydrates sugar leaving behind carbon which is black.
(i) With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process
(ii) What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with
(i) Potassium nitrate
(i) Formation of sulphur dioxide:
S + O2 → SO2
Conversion of SO2 to SO3
Conversion of sulphur trioxide to oleum:
SO3 + H2SO4→ H2S2O7
Dilution of oleum:
H2S2O7 + H2O → 2H2SO4
i. Non-volatile nature
ii. As an oxidising agent
In the given equation identify the role played by concentrated sulphuric acid S + 2H2SO4→ 3SO2 + 2H2O
(a) Non-volatile acid
(b) Oxidising agent
(c) Dehydrating agent
(d) None of the above
(b) Oxidising agent
State one appropriate observation for each of the following.
(i) Concentrated sulphuric acid is added dropwise to a crystal of hydrated copper sulphate.
(ii) Dehydration of Concentrated Sulphuric acid with sugar crystals
(i) When conc. H2SO4 is added to a crystal of hydrated copper sulphate, it removes water of crystallisation from salt.
(ii) C12H22O11 + conc. H2SO4→ 6C + 6H2O
Give one equation each to show the following properties of sulphuric acid :
(i) Dehydrating property
(ii) Acidic nature
(iii) As a non-volatile acid
(i) Dehydrating property of sulphuric acid:
H2SO4 has a great affinity for water, and therefore, it acts as a dehydrating agent.
(ii) Acidic nature of sulphuric acid:
It acts as a strong dibasic acid.
It reacts with metals, metal oxides, metal hydroxides and carbonates to form metallic sulphates and hydrogen at ordinary temperature.
Mg + H2SO4→ MgSO4 + H2↑
CuO + H2SO4 → CuSO4 + H2O
2NaOH + H2SO4→ Na2SO4 + 2H2O
ZnCO3 + H2SO4→ ZnSO4 + H2O + CO2↑
(iii) As a non-volatile acid:
It has a high boiling point, so it is used to prepare volatile acids such as HCl, HNO3 and acetic acid from their salts.
NaCl + H2SO4→ NaHSO4 + HCl
NaNO3 + H2SO4 → NaHSO4 + HNO3
CH3COONa + H2SO4 → NaHSO4 + CH3COOH
(i) Give balanced chemical equations for the action of sulphuric acid on each of the following
1. Potassium hydrogen carbonate
(ii) In the contact process for the manufacture of sulphuric acid give the equations for the conversion of sulphur trioxide to sulphuric acid.
1. Action of sulphuric acid on potassium hydrogen carbonate
2KHCO3 + H2SO4→ K2SO4 + 2H2O + 2CO2↑
2. Action of sulphuric acid on sulphur
S + 2H2SO4→ 3SO2 + 2H2O
(ii) In the contact process for the manufacture of sulphuric acid, the equations for the conversion of sulphur trioxide to sulphuric acid are
SO3 + H2SO4→ H2S2O7
(oleum or pyrosulphuric acid)
H2S2O7 + H2O → 2H2SO4
Chapter 10 - Study of Sulphur Compound: Sulphuric Acid Excercise 256
A,B,C and D summarise the properties of sulphuric acid depending on whether it is dilute or concentrated.
A = Typical acid property
B = Non-Volatile acid
C = Oxidising agent
D = Dehydrating agent
Choose the property (A,B,C or D) depending on which is relevant to each of the following :
(i) Preparation of hydrogen chloride gas
(ii) Preparation of copper sulphate from copper oxide
(iii) Action of cone, sulphuric acid on sulphur
Write balanced chemical equations to show :
(i) The oxidizing action of conc.sulphuric acid on carbon
(ii) The behavior of H2SO4 as an acid when it reacts with magnesium
(iii) The dehydrating property of conc.sulphuric acid
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