ICSE Class 10 Chemistry 2023 Solved Paper

Study the following observations and name the anions present in each of the reactions.

Question : 59 of 88

Marks: +1, -0

When few drops of dilute sulphuric acid is added to Salt '

R

' and heated, a colourless gas is released which turnsmoist lead acetate paper silvery black.

Solution:

R

' is sodium sulphide. When it heated with. dil.

{\H}_2 {\SO}_4

a colourless gas

{\H}_2 {\S}

is released which turns moist lead acetate paper to silvery black, due to the formation of lead sulphide.

\;{{ {\Na}_2 {\S}}}↙{{' {\R} {'}}}+\;{ {\H}_2 {\SO}_4↙{\;\text " dil. "\;}} → \;{ {\Na}_2 {\SO} _4}+ {\H}_2 {\S} ↑

( {\CH}_3 {\COO}) _2 {\Pb}+ {\H}_2 {\S} → \;{ {\PbS}}↙{\;\text " Black "\;}

+ {\CH}_3 {\COOH}

Anion is

{\S}^{2-}

(Sulphide)

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