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प्रश्न
Write down the changes that will be seen in each instance and explain the reason behind them.
Dilute H2SO4 was taken in an electrolytic cell and an electric current was passed through it.
उत्तर
In dilute H2SO4, H+ and `"SO"_4^(2-)` ions are produced due to dissociation. Electric current passes through these ions. During this process H2 gas is produced at the negative side, and O2 gas is produced at the positive side.
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संबंधित प्रश्न
Define the following term:
Electrolysis
State the electrode reaction at the anode during electrolysis of:
sodium chloride solution.
Give reason for the following:
Aluminium is extracted from its oxide by electrolytic reduction and not by convectional reducing agents.
Give reason for the following:
In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.
Give reason for the following:
Ammonia is unionised in the gaseous state but in the aqueous solution, it is a weak electrolyte.
Give reason for the following:
A graphite anode is preferred to other inert electrodes during the electrolysis of fused lead bromide.
Complete the sentence by choosing correct word given in bracket.
Electrolysis is the passage of ___________________
(electricity / electrons)
From the given list :
NaCl, NaOH, H2O (pure), NH4OH, urea, dil.H2SO4, glucose, acetic acid, H2CO3.
Select :
a) Substances which will behave as strong electrolytes.
b) Substances which will behave as weak electrolytes.
c) Substances which are non-elctrolytes.
Write the difference between with examples:
A strong electrolyte and a weak electrolyte
State your observation for the following electrolytic reaction:
Solid copper sulphate is electrolysed between platinum electrodes.
With reference to the electrolysis of acidulated water, answer the following :
a) why distilled water is a non- electrolyte?
b) What is the electrolytic cell called?
c) State what you would observe at the (i) Cathode (ii) Anode
d) Summarize the electrode reactions.
e) why is electrolysis of acidulated water considered as an example of catalysis?
Fill in the blank.
The ions which discharge on the negative electrode during electrolysis _____________ electrons, Thus the ions are said to be __________.
Fill in the blank :
Non-metallic ions are _____________ because they _____________ electrons.
Name : A salt which is a weak electrolyte.
Choose the correct answer from the option given below:
In electrolysis of molten lead bromine anode is made up of
Give one example of a substance which contain :
Ions only
Copy and complete the following table which refers to two practical applications of electrolysis.
| Anode | Electrolyte | Cathode | |
| Silver plating of a spoon | Solution of potassium argentocyanide | ||
| Purification of copper |
Complete the sentence by choosing correct words given in brackets.
Electrolysis is the passage of __________ (electricity/electrons) through a liquid or solution accompanied by a __________ ( physical/chemical ) change.
Choose A, B, C or D to match the descriptions (i) to (v) below . Some alphabets may be repeated.
(A) Non-electrolyte, (B) Strong electrolyte, (C) Weak electrolyte, (D) Metallic conductor
(i) Molten ionic compound
(ii) Carbon tetrachloride
(iii) An aluminium wire
(iv) A solution containing solvent molecules, solute molecules and ions formed by the dissociation of solute molecules
(v) A sugar solution with sugar molecules and water molecules.
X - \[\ce{HCl <=> H^{1+} + Cl-}\] (in solution state)
Y - \[\ce{PbBr2 <=> Pb^{2+} + 2Br^{1-}}\] (in molten state)
From the above reaction X or Y, identify the reaction which exhibit:
ionization
