ICSE Class 10 Chemistry 2020 Solved Paper

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

Question : 73

Total: 86

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=MnO2∕ Magnese dioxide
MnO2 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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