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\( \mathrm{pH} \) of \( 0.01 \mathrm{M}-\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \) and \( 0.02 \mathrm{M}-\mathrm{NH}_{4} \mathrm{OH} \)
P buffer \( \left(\mathrm{p} K_{\mathrm{a}}\right. \) of \( \left.\mathrm{NH}_{4}{ }^{+}=9.26\right) \) is

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(1) \( 9.26+\log 2 \)
(2) \( 9.26-\log 2 \)
(3) \( 4.74+\log 2 \)
(4) 9.26
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