Advertisements
Advertisements
प्रश्न
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Advertisements
उत्तर
When a piece of magnesium strip is dropped in dilute hydrochloric acid, hydrogen gas is evolved and hence it is a chemical change.
\[\ce{Mg + dil{.} 2HCl -> MgCl2 + H2↑}\]
as new substances, MgCl2 and H2 with new properties are produced and the reaction is irreversible.
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Write true or false for the statement
A natural change can also be a desirable change
What role does energy play in initiating a chemical change ?
Classify the following changes as physical or chemical:-boiling
Write true or false
Earthquake is a desirable change.
Write true or false
Deforestation is a man-made change.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Classify the following as a physical or a chemical change.
Boiling of water
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
