The oxide that remains unchanged when heated in hydrogen ...
The oxide that remains unchanged when heated in hydrogen is?
CuO
Fe2O3
PbO2
ZnO
Correct answer is D
Zinc oxide doesn't react to hydrogen gas because the reaction is not spontaneous.
Figure 1 above shows part of the periodic Table which of the elements belongs to the p-block?...
When a substance is oxidized, it ...
Calcium and magnesium belong to the group of the periodic table because both? ...
Which of the following is NOT correct test for the named organic compound in each case? ...
The bond formed when ammonia reacts with hydrogen ion to form ammonium ion is ...
A characteristic reaction of the compounds with the general formula CnH2n is...
Which of the following is used widely in the manufacture of flavours and perfumes? ...