Which of the following compound on heating does not produce metal oxide?

Options

A. `MgCl_(2)*6H_(2)O`
B. `K_(2)Cr_(2)O_(7)`
C. `K_(2)CO_(3)`
D. `Cu(NO_(3))_(2)`

Answer

C

Explanation

`MgCl_(2)*6H_(2)O overset(Delta)toMgO+2HCl+5H_(2)O`
`2K_(2)Cr_(2)O_(7) overset(Delta)to 2K_(2)CrO_(4)+Cr_(2)O_(3)+(3)/(2)O_(2)uarr`
`K_(2)CO_(3) overset(Delta)to` does not decompose but metls
`Cu(NO_(3))_(2)overset(Delta)toCuO+2NO_(2)uarr+(1)/(2)O_(2)uarr`