1. Tardigrade
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  3. Chemistry
  4. 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.

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Q. Assertion On addition of $NH_{4}Cl$ to $NH_4OH$ solution, $pH$ decreases but remains greater than $7$.
Reason Addition of $NH_{4}^{+}$ ion decreases ionisation of $NH_{4}OH$ thus$ [OH^{-}]$ is decreased, hence $pH $decreases.

AIIMSAIIMS 2013

Solution:

Due to common ion effect lonisation of $NH _{4} OH$ decreases so, $pH$ decreases.