Question

Assertion (A): Magnesium hardly reacts with cold water
Reason (R): "Pt' has least reactive nature​

Answer 1

Answer:

Explanation:

Both the assertion and reason are true

The the reason is not matching with the assertion

The reason should be as Mg is a very reactive metal.

For more information

youtu.be/8QbOeLza1H0....

Answer 2

Both assertion and reason are true but the reason is not the proper explanation for the assertion.

• Magnesium hardly reacts with cold water because of the formation of magnesium hydroxide on its outer surface which prevents the magnesium from further contact with water.
• Platinum is a noble gas with no unpaired electrons which deprives it of forming bonds with elements in nature, hence it is found unreacted in nature.
• The reaction of magnesium has nothing to do with how platinum is the least reactive element.