Short answerEasy1 mark
6(a)
Identify the salts P, Q, R from the following observations:
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.
Topic: Practical tests and observations
Previous-year question practice database
Answer
Exam answer
Manganese dioxide, MnO₂.
Explanation
Black MnO₂ with conc. HCl liberates greenish-yellow Cl₂.
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