Amongst the following, the total number of compounds whose aqueous solution turns red litmus pap....

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Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is:
\( \mathrm{P} \)
\( \mathrm{KCN}, \mathrm{K}_{2} \mathrm{SO}_{4},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{C}_{2} \mathrm{O}_{4}, \mathrm{NaCl}, \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}, \mathrm{FeCl}_{3} \), \( \mathrm{K}_{2} \mathrm{CO}_{3}, \mathrm{NH}_{4} \mathrm{NO}_{3}, \mathrm{LiCN} \)


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