Advertisements
Advertisements
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.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Explain why it is preferable to use a number of graphite electrodes as the anode instead of a single electrode, during the above electrolysis.
Define the following term:
Electrolysis
What is the difference between:
Electrolytic dissociation and ionisation.
A solution of caustic soda (NaOH) in water or when fused, conducts an electric current. What is the similarity in these two cases?
State the electrode reaction at the anode during electrolysis of:
sodium chloride solution.
Give reason for the following:
The ratio of hydrogen and oxygen formed at the cathode and anode is 2 : 1 by volume.
Write down the word or phrase from the bracket that will correctly fill in the blank in the following sentence:
Pure water consists entirely of ________________ (ions/ molecules).
To carry out the so-called “electrolysis of water”. Sulphuric acid is added to water. How does the addition of sulpuric acid produce a conducting solution?
Complete the sentence by choosing correct word given in bracket.
through a liquid or a solution accompanied by a ___________ (Physical / chemical) change.
Fill in the blank :
Hydrogen and metallic ions are ____________ because they ____________ electrons.
Name : A positively charged not metallic ion
Why is it necessary to add acid to water before proceeding with electrolysis of 'water'?
Copy and complete the following sentence :
With platinum electrodes, hydrogen is liberated at the ______and oxygen at the _________ during the electrolysis of acidified water.
Write the equations of the reactions which take place at the cathode and anode when acidified water is electrolyzed.
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.
State your observation of the following case:
At the cathode when acidified aqueous copper sulphate solution is electrolyzed with copper electrodes.
Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.
If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.
108 g of silver (molar mass 108 g mol-1) is deposited at cathode from AgNO3 (aq) solution by a certain quantity of electricity. The volume (in L) of oxygen gas produced at 273 K and 1 bar pressure from water by the same quantity of electricity is ______.
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:
electrolytic dissociation
