\( \mathrm{p}_{a} \) of \( \mathrm{NH}_{4}^{+} \)is \( 9.26 \). Hence, effective range for \( \m...

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\( \mathrm{p}_{a} \) of \( \mathrm{NH}_{4}^{+} \)is \( 9.26 \). Hence, effective range for \( \mathrm{NH}_{4} \mathrm{OH}-\mathrm{NH}_{4} \mathrm{Cl} \) buffer is about \( \mathrm{pH} \) :
(a) \( 8.26 \) to \( 10.26 \)
(b) \( 4.74 \) to \( 5.74 \)
(c) \( 3.74 \) to \( 5.74 \)
(d) \( 8.26 \) to \( 9.26 \)
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