Explain the term 'variable valency' Copper having electronic conf… - Vidyadip

Question

Explain the term 'variable valency' Copper having electronic configuration $2,8,18,1$ exhibits variable valency. Give a reason for the same $\&$ name the compound $\ce{CuCl \& CuCl _2}$.

✓

Answer

Variable valency: "When an element has more than one valency, its valency is called variable valency." Copper exhibit valency ' $1$ ' and ' $2$ ' i.e. has variable valency reason for variable valency Valency is $-$ the number of electrons lost or gained from the outer shell of an atom of an element $-$ during chemical reaction. Variation in this gain or loss results in 'variable valency'.
Lower valency ends with $- ous$
Higher valency ends with $- ic$
$\ce{CuCl}$ is named as cuprous chloride $($lower valency$)$
OR
$\ce{Cu [ I ] Cl}$ i.e. Copper $\ce{[I]}$ chloride and
$\ce{CuCl _2-}$ Cupric chloride $($higher valency$)$
i. e. Copper $\ce{[II]}$ chloride $\ce{Cu [ II ] Cl _2}$

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 "[3 Mark Question Answer]" from Language of Chemistry→Language of Chemistry — all question types→CHEMISTRY STD 8 question papers→ICSE Board STD 8 question papers→ICSE Board question paper generator→

Similar questions

Define physical change. Give two examples for the above changes.

Define the term chemical double displacement reaction. Support your answer by giving one example of neutralisation reaction and one example of precipitation reaction.

What is chromatography? For which type of mixture is it used?

Define the term 'solubility ' of a solute in water. If $10 g$. of a solute is added to $100 g$. of water at $50^{\circ} C$ and stirred, it is seen that the total solute dissolves at that temperature giving an unsaturated solution. is $10 g$, the solubility of the solute in water. Give reasons.

Give reasons for the following : Hydrogen can be used as a fuel.

Bring out clearly the difference between following by giving examples:
(a) Material and substance
(b) Homogeneous material and heterogeneous material.

What are the observations of the experiment done by Rutherford in order to determine the structure of an atom?

Name the nucleons present within the nucleus of an atom and state their mass and charge

Suggest one method for the removal along with the reaction for temporary hardness.

Electrolytic decomposition $\&$ photochemical decomposition.