In separate experiments, mixtures of CuO/C and of MgO/C are strongly heated in the apparatus shown.
What happens to the limewater in these experiments?

1 )
CuO/C: goes cloudy / MgO/C: goes cloudy
CuO/C: goes cloudy / MgO/C: stays clear
3 )
CuO/C: stays clear / MgO/C: goes cloudy
4 )
CuO/C: stays clear / MgO/C: stays clear
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