Chemistry · Qualitative Inorganic Analysis
The correct sequence of reagent addition for the qualitative analysis of Pb2+, Cd2+, Sr2+, and Ni2+ ions in an aqueous solution of a mixture of their nitrate-containing salts is:
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- 1(i) HCl (aq.) (ii) H2S (basic) (iii) H2S (acidic) (iv) (NH4)2CO3 (aq.)
- 2(i) (NH4)2CO3 (aq.) (ii) H2S (acidic) (iii) H2S (basic) (iv) HCl (aq.)
- 3(i) H2S (acidic) (ii) H2S (basic) (iii) HCl (aq.) (iv) (NH4)2CO3 (aq.)
- 4(i) HCl (aq.) (ii) H2S (acidic) (iii) H2S (basic) (iv) (NH4)2CO3 (aq.)✓
Correct answer
(i) HCl (aq.) (ii) H2S (acidic) (iii) H2S (basic) (iv) (NH4)2CO3 (aq.)
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