ICSE Class 10 Chemistry 2020 Solved Paper

Identify the salts $P, Q, R$ from the following observations :

Question : 73 of 86

Marks: +1, -0

Salt

{R}

is black in colour. On reacting with concentrated

{\HCl}

, it liberates a pungent greenish yellow gas which turns moist starch iodide paper blue black.

Solution:

Salt

{\R}= {\MnO}_2 \/

Magnese dioxide

{\MnO}_2

is a black solid, which on reacting with conc.

{\HCl}

liberates greenish yellow chlorine gas which turns starch iodide paper blue black.

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