p-Block Elements-I 1 Question 19
19. Match the following.
$(2006,6 M)$
| Column I | Column II | ||
|---|---|---|---|
| A. | $\mathrm{Bi}^{3+} \rightarrow(\mathrm{BiO})^{+}$ | p. | Heat |
| B. | $\left[\mathrm{AlO} _{2}\left\lceil\rightarrow \mathrm{Al}(\mathrm{OH}) _{3}\right.\right.$ | q. | Hydrolysis |
| C. | $\mathrm{SiO} _{4}^{4-} \rightarrow \mathrm{Si} _{2} \mathrm{O} _{7}^{6-}$ | r. | Acidification |
| D. | $\left(\mathrm{B} _{4} \mathrm{O} _{7}^{2-}\right) \rightarrow\left[\mathrm{B}(\mathrm{OH}) _{3}\right]$ | s. | Dilution by water |
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Answer:
Correct Answer: 19. $A \longrightarrow q; B \longrightarrow r; C \longrightarrow p; D \longrightarrow q,R$
Solution:
- (A) $\mathrm{Bi}^{3+}$ hydrolysis to $(\mathrm{BiO})^{+}-q$.
(B) $\left[\mathrm{AlO} _{2}\right\rceil$ exist in basic medium, on acidification gives $\mathrm{Al}(\mathrm{OH}) _{3}-r$.
(C) Orthosilicate $\left(\mathrm{SiO} _{4}^{4-}\right)$ on heating changes into pyrosilicate $\mathrm{Si} _{2} \mathrm{O} _{7}^{6-}-p$
(D) Tetraborate ion $\left[\mathrm{B} _{4} \mathrm{O} _{7}^{2-}\right]$ on treatment with dil. acid hydrolysis gradually to orthoboric acid $-q, r$.
