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Chemistry [1 Mark Question Answer]

Sulphuric Acid · ICSE STD 10 (ICSE - English Medium). 38 questions.

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[1 Mark Question Answer]

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38 questions · timed · auto-graded

Question 11 Mark
Why the impurity of arsenic oxide must be removed before passing the mixture of $SO_2$​​​​​​​ and air through the catalytic chamber?
Answer
Impurity of ARSENIC poisons the catalyst [i.e. deactivates the catalyst]. So, it must be removed before passing the mixture of $SO_2$​​​​​​​ air through the catalytic chamber.
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Question 21 Mark
Sulphuric acid is manufactured by the contact process
Name a gas that can be oxidized to sulphur.
Answer
Hydrogen sulphide.
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Question 31 Mark
Sulphuric acid is manufactured by the contact process
Name the catalyst used.
Answer
Vanadium pentoxide $(V_2O_5)$
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Question 41 Mark
Comment, sulphuric acid is referred to as Oil of vitriol.
Answer
Sulphuric acid is referred to as Oil of vitriol as it was obtained as an oily viscous liquid by heating crystals of green vitriol.
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Question 51 Mark
Comment, sulphuric acid is referred to as King of chemicals.
Answer
Sulphuric acid is called King of Chemicals because there is no other manufactured compound which is used by such a large number of key industries.
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Question 61 Mark
Give reason for the following:
A piece of wood becomes black when concentrated sulphuric acid is poured on it.
Answer
A piece of wood becomes black when concentrated sulphuric acid is poured on it because it gives a mass of carbon.
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Question 71 Mark
What is the name given to the salts of sulphuric acid?
Answer
The name given to the salts of sulphuric acid is Sulphate and bisulphate.
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Question 81 Mark
What is the name given to the salts of sulphurous acid?
Answer
The name given to the salts of sulphurous acid is Hydrogen sulphites and Sulphites.
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Question 91 Mark
What property of conc. $H_2SO_4$​​​​​​​ is made use of the following case? Give an equation for the reaction on the same:
In the preparation of sulphur dioxide by warming a mixture of conc. Sulphuric acid and copper – turnings
Answer
Due to its oxidizing character
$Cu + H_2SO_4 \rightarrow CuSO_4 + 2H_2O + SO_2$
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Question 101 Mark
What property of conc. $H_2SO_4$ is made use of the following case? Give an equation for the reaction on the same:
In the preparation of $CO$ and $HCOOH$
Answer
It is a dehydrating agent.
$HCOOH \xrightarrow{\text { Conc } \cdot H _2 SO _4} CO + H _2 O$
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Question 111 Mark
Why is Concentrated sulphuric acid kept in air tight bottles?
Answer
Concentrated sulphuric acid is hygroscopic substance that absorbs moisture when exposed to air. Hence, it is stored in air tight bottles.
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Question 121 Mark
Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.
Answer
Carbondioxide gas is released when sodium carbonate is added to solution of sulphur dioxide.
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Question 131 Mark
Name the acid formed when sulphur dioxide dissolves in water.
Answer
The acid formed when sulphur dioxide dissolves in water is sulphurous acid.
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Question 141 Mark
Which property of sulphuric acid accounts for its use as a dehydrating agent?
Answer
Sulphuric acid is powerful dehydrating agent on account of its strong affinity towards water.
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Question 161 Mark
The gas produced by the action of concentrated sulphuric acid on sodium chloride.
Answer
Hydrogen chloride
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Question 211 Mark
A green coloured compound formed when $SO _2$ is passed through acidified $K _2 Cr _2 O _7$.
Answer
Chromium sulphate
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Question 221 Mark
The solution which turns black on coming in contact with hydrogen sulphide?
Answer
Lead acetate, lead nitrate solution
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Question 231 Mark
An organic acid which on reaction with concentrated sulphuric acid, produces two oxides of carbon?
Answer
Oxalic acid
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Question 241 Mark
Name an orange colour solution which turns in green colour when sulphur dioxide gas is passed through it.
Answer
Acidified potassium dichromate
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Question 261 Mark
A neutral oxide of carbon formed when formic acid reacts with concentrated sulphuric acid.
Answer
Carbon monoxide
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Question 281 Mark
Give the chemical name and common name of a reagent used in photographic work.
Answer
Sodium thiosulphate
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Question 301 Mark
Name the solution which turns colourless when sulphur dioxide gas is passed through it?
Answer
Potassium permanganate
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[1 Mark Question Answer] - Chemistry STD 10 Questions - Vidyadip