question_answer

Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is

\[KCN\]	\[{{K}_{2}}S{{O}_{4}}\]
\[{{(N{{H}_{4}})}_{2}}{{C}_{2}}{{O}_{4}}\]	\[NaCl\]	\[Zn{{(N{{O}_{3}})}_{2}}\]
\[FeC{{l}_{3}}\]	\[{{K}_{2}}C{{O}_{3}}\]
\[N{{H}_{4}}N{{O}_{3}}\]	\[LiCN\]

 

Answer:

3