Assertion On addition of NH4Cl to NH4OH solution, pH decreases but remains greater than 7. Reason Addition of NH4+ ion decreases ionisation of NH4OH thus [OH-] is decreased, hence pH decreases.

Question

Assertion On addition of NH4Cl to NH4OH solution, pH decreases but remains greater than 7. Reason Addition of NH4+ ion decreases ionisation of NH4OH thus [OH-] is decreased, hence pH decreases. (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) Both Assertion and Reason are false.

Tardigrade Admin · Accepted Answer

Due to common ion effect lonisation of NH 4 OH decreases so, pH decreases.

Q. Assertion On addition of $N H_{4} Cl$ to $N H_{4} O H$ solution, $p H$ decreases but remains greater than $7$ .
Reason Addition of $N H_{4}^{+}$ ion decreases ionisation of $N H_{4} O H$ thus $[O H^{-}]$ is decreased, hence $p H$ decreases.

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

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

Assertion is true but Reason is false.

Both Assertion and Reason are false.

Due to common ion effect lonisation of $N H_{4} O H$ decreases so, $p H$ decreases.

Q. Assertion On addition of NH4​Cl to NH4​OH solution, pH decreases but remains greater than 7. Reason Addition of NH4+​ ion decreases ionisation of NH4​OH thus[OH−] is decreased, hence pHdecreases.