Mark by ✓ symbol in a corresponding window those ions for which the assertions written on the left side of the table, are true and calculate number of total blank windows after filling table.

Question

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* Assertion 1 (White ppt with NaOH): Only $P b^{2 +}$ forms a white precipitate ( $P b (O H)_{2}$ ). (1 match)

* Assertion 2 (Black ppt with $H_{2} S / H^{+}$ ): $P b^{2 +}$ ( $P b S$ ), $A g^{+}$ ( $A g_{2} S$ ), and $C u^{2 +}$ ( $C u S$ ) form black precipitates. (3 matches)

* Assertion 3 (Colored solution with excess KCN): Only $F e^{3 +}$ forms a colored (yellowish) solution of $[F e (CN)_{6}]^{3 -}$ . (1 match)

* Assertion 4 (Insoluble with excess $N H_{4} O H$ ): $F e^{3 +}$ and $P b^{2 +}$ form insoluble precipitates, while $A g^{+}$ and $C u^{2 +}$ dissolve. (2 matches)

* Assertion 5 (Brownish color with excess KI): $F e^{3 +}$ and $C u^{2 +}$ oxidize $I^{-}$ to release brown iodine ( $I_{2}$ ). (2 matches)

* Assertion 6 (Redox change with excess $N a_{2} S_{2} O_{3}$ ): All four cations ( $F e^{3 +}$ , $P b^{2 +}$ , $A g^{+}$ , $C u^{2 +}$ ) undergo chemical or redox-associated transformations. (4 matches)

Total number of checkmarks = $1 + 3 + 1 + 2 + 2 + 4 = 13$ .

Chemistry - Salt Analysis Question with Solution | TestHub

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