Among the following, the total number of compounds whose aqueous solution turns red litmus to blue is:
$K C N, K_{2} {S O}_{4}, {({N H}_{4})}_{2} C_{2} O_{4}, N a C l, Z n {({N O}_{3})}_{2}, F e {C l}_{3}, K_{2} {C O}_{3}, {N H}_{4} {N O}_{3}, L i C N$ .

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Solution

Red litmus paper is used to test an alkaline/base. When a red litmus paper is immersed in a base or alkaline, the red litmus paper turns blue indicating the given solution as alkaline/base.
Bases are ions that break up to form $O H^{-}$ (hydroxide) ions in water. The greater the concentration of $O H^{-}$ ions, the stronger is the base.
$K C N, K_{2} {C O}_{3}, L i C N$ will give basic solution as they give strong base in solution.

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K C N, K_{2} {S O}_{4}, {({N H}_{4})}_{2} {C_{2} O}_{4}, N a C l, Z n {({N O}_{3})}_{2}, F e {C l}_{3}, K_{2} C O_{3}, {N H}_{4} {N O}_{3}, L i C N

K C N, K_{2} {S O}_{4}, ({N H}_{4})_{2} C_{2} O_{4}, N a C l, Z n ({N O}_{3})_{2}, F e {C l}_{3}, K_{2} {C O}_{3}, {N H}_{4} {N O}_{3}, L i C N

{A g}_{2} C_{2} O_{4}

25^{o} C

1.29 \times 10^{- 11} {m o l}^{3} L^{- 3}

K_{2} C_{2} O_{4}

0.1520 m o l

500 m L

{A g}_{2} {C O}_{3}

{A g}_{2} {C O}_{3} + K_{2} C_{2} O_{4} ⇌ {A g}_{2} C_{2} O_{4} + K_{2} {C O}_{3}

0.0358 m o l e

K_{2} {C O}_{3}

K_{2} C_{2} O_{4}

K_{2} {C O}_{3}

{A g}_{2} {C O}_{3}

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