💥 Group II Cations Quiz

1. What is the group reagent for Group II cations?

A. Dilute HCl
B. H₂S in presence of dilute HCl
C. NH₄OH
D. NaOH

2. What is the color of CdS precipitate?

A. Black
B. Yellow
C. Orange
D. White

3. Which ion gives an orange sulfide precipitate?

A. Sb³⁺
B. Sn²⁺
C. Bi³⁺
D. Cu²⁺

4. What is the role of dilute HCl before passing H₂S?

A. To oxidize ions
B. To decrease S²⁻ ion concentration via common ion effect
C. To reduce ions
D. To precipitate chlorides

5. Which of the following sulfides is yellow?

A. CuS
B. Bi₂S₃
C. SnS₂
D. HgS

6. Why is H₂S passed in acidic medium for Group II analysis?

A. To increase sulfide ion concentration
B. To prevent precipitation of higher group cations
C. To form hydroxides
D. To oxidize sulfide ions

7. What is the color of HgS precipitate?

A. Yellow
B. Black
C. Orange
D. White

8. Which ion’s sulfide is orange?

A. As³⁺
B. Sb³⁺
C. Sn²⁺
D. Bi³⁺

9. Which ion is responsible for forming yellow precipitate with sulfide and is also known for forming soluble thioacid complexes?

A. As³⁺
B. Hg²⁺
C. Bi³⁺
D. Cu²⁺

10. What is the use of adding HCl before passing H₂S?

A. To oxidize metal ions
B. To provide common ion effect and control precipitation
C. To increase pH strongly
D. To dissolve oxides

Advanced Quiz on Group II Cations (Hg²⁺, Bi³⁺, Cu²⁺, Cd²⁺, As³⁺, Sn²⁺, Sb³⁺)