| I. It represents the plots of \[{{\Delta }_{f}}{{G}^{\bigcirc -}}\]vs T for the formation of oxides of various elements. It predicts the feasibility of thermal reduction of an ore. |
| II. It explains that \[{{\Delta }_{f}}{{G}^{\bigcirc -}}\] has more \[+ve\]value at high temperatures for less reactive metals such as \[Ag\]and\[Hg\]. This implies that both \[A{{g}_{2}}O\] and \[{{H}_{2}}O\] are stable and does not decompose at high temperatures. |
| III. It explains that \[C{{r}_{2}}{{O}_{3}}\] can be reduced by \[Al\]metal. |
| IV. It explains that \[ZnO\]cannot be reduced by\[Si\] |
A) I, II
B) I, III
C) II, III, IV
D) All of the above.
Correct Answer: B
Solution :
[b] Statements I and III are CORRECT Statements II and IV are INCORRECT CORRECT statements (II): Both \[A{{g}_{2}}O\] and \[HgO\]are unstable and decomposes at high temperature. \[2A{{g}_{2}}O\xrightarrow{\Delta }4Ag+{{O}_{2}}\] \[2HgO\xrightarrow{\Delta }2Hg+{{O}_{2}}\] CORRECT statement (IV): \[ZnO\]can be reduced by \[Si\]but \[Si{{O}_{2}}\] can not be reduced by \[Zn\] \[2ZnO+Si\xrightarrow{{}}Si{{O}_{2}}+2Zn\]
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