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:
Which will not give metal on heating? (1)\[A{{g}_{2}}C{{O}_{3}}\] (2)\[ZnC{{O}_{3}}\] (3)\[HgO\] (4)\[CuO\]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: C
Solution :
The salts of metals present beneath Hg in electrochemical series (along with Hg), gives metal on heating. (1) \[2A{{g}_{2}}C{{O}_{3}}\xrightarrow{{}}\underset{metal}{\mathop{4Ag\downarrow }}\,+2C{{O}_{2}}+{{O}_{2}}\] (2) \[ZnC{{O}_{3}}\xrightarrow{{}}ZnO+C{{O}_{2}}\] (3) \[HgO\xrightarrow{{}}\underset{metal}{\mathop{2Hg\downarrow }}\,+{{O}_{2}}\] (4) \[4CuO\xrightarrow{{}}2C{{u}_{2}}O+{{O}_{2}}\] \[\therefore \]\[ZnC{{O}_{3}}\]and\[CuO\]do not give metal on heating.
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