Chemistry

Problem

Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like

CH_4

). This process

X

is called ..... and the metal contains impurities of

Y

is ..... a.

X = \text{cupellation}

Y = CuO_2

X = \text{polling}

Y = Cu_2O

X = \text{polling}

Y = CuO

X = \text{cupellation}

Y = CuO