Short answerEasy1 mark
6(a)
Identify the salts P, Q, R from the following observations:
Salt Q is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas. Solution of salt Q produces chalky white insoluble precipitate with excess of ammonium hydroxide.
Topic: Qualitative analysis using NaOH and NH₄OH
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Answer
Exam answer
Lead nitrate, Pb(NO₃)₂.
Explanation
Heating gives buff-yellow PbO and brown NO₂; Pb²⁺ gives white Pb(OH)₂ insoluble in excess NH₄OH.
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