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Find out total number of compounds which...

Find out total number of compounds which on heating undergo redox reactions.
`PbCl_(4),Mg(NO_(3))_(2),HgC_(2)O_(4),Ag_(2)CO_(3),Pb(CN)_(4),Al(OH)_(3),Cu(CN)_(2)`

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The correct Answer is:
6
`PbCl_(4),Mg(NO_(3))_(2),HgC_(2)O_(4),Ag_(2)CO_(3),Pb(CN)_(4),Cu(CN)_(2)`.
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