Chemistry
State the inference drawn from the following observations :
(i) On carrying out the flame test with a salt P a brick red flame was obtained. What is the cation in P ?
(ii) A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.
(iii) pH of liquid R is 10. What kind of substance is R?
Analytical Chemistry
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Answer
(i) Cation in P is Ca2+ (calcium ion)
(ii) The gas Q is H2S (Hydrogen sulphide).
Pb(CH3COO)2 [colourless] + H2S ⟶ PbS [black] + 2CH2COOH
(iii) R is an alkaline substance.
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