What weight of zinc would be required to produce enough hydrogen to reduce completely 8.5 g of copper oxide to copper ?

What is the colour of coating of copper oxide?

what volume of oxygen would be required to burn completely 400 ml of acetylene [C2H2]?

What pressure of H_2 would be required to make the e.m.f of hydrogen elecrode zero in pure water at 25^@C ?

Hydrogen and oxygen combine in the ratio of 1 :8 by mass to from water. What mass of oxygen gas would be required to react completely with 3g of hydrogen?

Explain, why carbon can reduce copper but not calcium oxide to calcium?

What will be the colour produced when a drop of pehnolphthalein is added to Copper chloride.

A metal oxide has the formula X_2O_3 . It can be reduced by hydrogen to give free metal and water. 0.1596g of metal oxide requires 6mg of hydrogen for complete reduction. The atomic mass of the metal (in amu) is :