Question

Assertion : ${NH}_3$ is a Lewis base.
Reason: It can accept a proton.

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

• E. Both Assertion and Reason are false
  

Answer 1

Answer: (B)

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

$N{H}_3$ is Lewis base because it can donate an electron pair. Reason does not explain Assertion as It is not necessary that it will accept the $H^{+}$ only.
A Lewis base, then, is any species that donates a pair of electrons to a Lewis acid to form a Lewis adduct. For example, $O{H}^{-}$ and $N{H}_3$ are Lewis bases, because they can donate a lone pair of electrons. In the adduct, the Lewis acid and base share an electron pair furnished by the Lewis base