Question

Assertion: Noble gases were not present in the mendeleev's periodic table.

Reason: Noble gases were not discovered back then since they didn't form any compounds.

• A. A is true, but R is false.
• B. Both A and R are true, but R is not the correct explanation of A.
• C. A is false, but R is true.
• D. Both A and R are true and R is the correct explanation of A

Answer 1

The correct option is D Both A and R are true and R is the correct explanation of A

The best way to find or identify any element is to make it undergo reaction with some other element, but because the noble gases were so unreactive, they remain undiscovered for a long period of time.

Therefore, in Mendeleev's periodic table the noble gases were not involved.