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. | $[\mathrm{AlO}_2]^{-} \rightarrow \mathrm{Al}(\mathrm{OH})_3$ | 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) $[\mathrm{AlO} _{2}]^{-}$ 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 $-q, r$.
BETA
