State your observation for the following electrolytic reaction Aq… - Vidyadip

Question

State your observation for the following electrolytic reaction
Aqueous copper sulphate is electrolysed between platinum electrodes.

✓

Answer

When the electrolysis of copper sulphate(aqueous) is electrolysed between platinum electrodes the following reaction follows :
$\begin{aligned} & CuSO _4 \rightleftharpoons Cu ^{+2}+ SO _4^{2-} \\ & H _2 O \rightleftharpoons H ^{+}+ OH ^{-}\end{aligned}$
Reaction at cathode : Copper ions and hydrogen ions migrate towards the cathode, $Cu ^{+2}$ ions being lower in the electrochemical series are preferentially discharged to hydrogen ions to form neutral copper atoms at platinum cathode.
$
Cu ^{+2}+2^{e-} \longrightarrow Cu
$
Reaction at anode: Sulphate ions and hydroxyl ions migrate towards the anode, Hydroxyl ions are preferentially discharged to sulphate ions at anode, to form neutral particles of $OH ^{-}$, The electrically neutral hydroxyl reacts
among themselves to give water and oxygen.
$
\begin{aligned}
& OH ^{-}- e ^{-} \longrightarrow OH \\
& 4( OH ) \xrightarrow{-4 e ^{-}} 2 H _2 O + O _2
\end{aligned}
$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[5 Mark Question Answer]" from Electrolysis→Electrolysis — all question types→Chemistry STD 10 question papers→ICSE Board STD 10 question papers→ICSE Board question paper generator→

Similar questions

The molecules of alkene family are represented by a general formula $C_nH_{2n}.$
Answer the following:
(i) What do n and 2n signify?
(ii) What is the name of alkene when n=4?
(iii) What is the molecular formula of the alkene, if there are six
hydrogen atoms in it?
(iv) Write the molecular and structural formula of the first member of
alkene family.
(v) Write the molecular formulae of lower and higher homologues of
an alkene which contains four carbon atoms.

The pH values of three solutions P, Q and R are given in the table.

Solution	pH value
P	12
Q	2
R	7

Answer the following questions :
(i) Which solution will have no effect on litmus solution?
(ii) Which solution will liberate CO₂ when reacted with sodium carbonate?
(iii) Which solution will turn red litmus blue?
(iv) Which solution will turn blue litmus red?
(v) Which solution is also known as alkali?

An element has 2 electrons in its N shell. It reacts with a non-metal of atomic number 7. The compound formed reacts with warm water and produces a basic gas. Identify the elements and write a balanced chemical reaction.

M is the metal above hydrogen in metal activity series and the formula of its chloride is MCL₂. This chloride is sparingly soluble in water, but in its solution is good conductor of electricity. Answer the following questions:
(i) What kind of chemical bond is formed between M and Cl?
(ii) How many electrons are there in the valence shell of M?
(iii) Name the group to which M belongs.
(iv) State the reaction taking place at cathode during electrolysis.
(v) Name the product at anode during electrolysis.

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.

List the properties of ammonia that make it
(i) A good refrigerant
(ii) A cleaning agent
(iii) As a source of hydrogen

Concentrated nitric acid oxidizes phosphorous to phosphoric acid according to the following equation :
$P + 5HNO_3 \rightarrow H_3PO_4 + H_2O + 5NO_2$
What will be the volume of steam at the same time measured at $760\ mm$ of Hg pressure and $273^\circ C$ ? $[H=1, N=14, O=16, P=31]$

Write the equations of chlorination of ethane

How will you bring about following conversions:
(a) Methane to methanol
(b) Ethane to ethanol (acetaldehyde)
(c) Methane to methanoic acid

Name the substance used for drying ammonia gas? Why cannot substances such as conc.$H_2SO_4$, anhydrous calcium chloride and phosphorus pentoxide be used for drying ammonia gas?