Why Zinc not extracted from Zinc oxide through reduction using CO?

Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Write the balanced chemical equation for the following and identify the type of reaction in each case Zinc carbonate (s) rarr Zinc oxide (s) + Carbon dioxide (g)

Give reason - Why : Galvanised iron particles are protected from rusting even if the zinc coating is broken.

When the zinc electrode having electrode reduction potential -0.76V is attached to NHE, will it acts as anode or cathode?

One half-cell in a voltaic cell is constructed from a silver wire dipped in silver nitrate solution of unknonw concentration. It other half cell consists of a zinc electrode dipping in 1.0M solution of Zn(NO_3)_2 . A voltage of 1.48V is measure for this cell. Use this information to calculate the concentration of silver nitrate solution used (E_(Zn^(2+)//Zn)^0=-0.76V,E_(Ag^+//Ag)^0=+0.80V)

Describe how the following change are brought about zinc oxide into metallic Zinc.

Why Zinc oxide can be reduced to the metal by heating with Carbon andnot with Cr_2O_3 ?

The extraction of Au by leaching with NaCN involves both oxidation and reduction. Justify.