Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Following reaction (s) is/are involved in thermite process. (1) \[3M{{n}_{3}}{{O}_{4}}+8Al\xrightarrow[{}]{{}}9Mn+4A{{l}_{2}}{{O}_{3}}\] (2) \[C{{r}_{2}}{{O}_{3}}+2Al\xrightarrow{{}}A{{l}_{2}}{{O}_{3}}+2Cr\] (3) \[{{B}_{2}}{{O}_{3}}+2Al\xrightarrow{{}}2B+A{{l}_{2}}{{O}_{3}}\] (4) \[2Fe+A{{l}_{2}}{{O}_{3}}\xrightarrow{{}}2Al+F{{e}_{2}}{{O}_{3}}\]A) 1, 2 and 3 are correct.
B) 1 and 2 are correct.
C) 2 and 4 are correct.
D) 1 and 3 are correct.
Correct Answer: A
Solution :
In thermite process aluminium acts as a reducing agent and reduces the metal oxides into metal. In reaction, \[2Fe+A{{l}_{2}}{{O}_{3}}\xrightarrow{{}}2Al+F{{e}_{2}}{{O}_{3}}\] aluminium is reduced and metal acts as reducing agent. Hence, this reaction is not the thermite process.
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