Download App

Unit - 6.1 Chemical Reaction — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYUnit - 6.1 Chemical Reaction3 Marks
Question
Define the term chemical double displacement reaction. Support your answer by giving one example of neutralisation reaction and one example of precipitation reaction.
✓

Answer

A double displacement reaction is a type of chemical reaction in which positive and negative radicals of two reactants are exchanged which will lead to the formation of the product.
The neutralization reaction is also a kind of double displacement reaction in which an acid reacts with a base to form salt and water. The product salt contains anion from acid and cation from the base.
Example: Solution of Sodium hydroxide (NaOH) reacts with dilute Hydrochloric acid(HCI) to form the salt Sodium chloride (NaCl)and water.
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(I)

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 Unit - 6.1 Chemical Reaction→Unit - 6.1 Chemical Reaction — all question types→CHEMISTRY STD 8 question papers→ICSE Board STD 8 question papers→ICSE Board question paper generator→

Similar questions

In which of the three states of matter $–$ solids, liquids or gases is the movement of atoms about their own position. Give a reason for the same.
→
What do you understand by the following terms ?
→
Compare the structure of the crystal of diamond $\&$ graphite with special reference to the reason for diamond being the hardest natural substance while graphite one of the softest. Compare the electrical & thermal conductivity of the two crystalline allotropes of carbon.
→
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 one example each of $–$
$(a)$ A peroxide
$(b)$ A mixed oxide
$(c)$ A dioxide.
→
Differentiate between: Homogenous and heterogenous substances
→
‘Hydrogen is obtained by electrolysis of acidified water’. Answer the following pertaining to the preparation of hydrogen by electrolysis, $(a)$ The meaning of the term ‘electrolysis’ and ‘electrolyte’, $(b)$ Name the electrode
$(i)$ through which the current enters the electrolyte.
$(ii)$ at which hydrogen is liberated.
→
Define physical change. Give two examples for the above changes.
→
What are the advantages of chromatography?
→
State in brief the transformation of vegetable matter to different types of coal varying in carbon content. State two uses each of $(a)$ coal $(b)$ coke $(c)$ lampblack or soot.
→