The oxide which is not reduced by hydrogen is

Hydrogen has a tendency to gain one electron to acquire the helium configuration. In this respect,it resembles:

The total number of isotopes of hydrogen and the number of radioactive isotopes among them,respectively,are:

Which one of the following substances is used in the laboratory for a fast drying of neutral gases?

Complete the following chemical reactions:
$(i) \ PbS_{(s)} + H_2O_{2_{(aq)}} \to $
$(ii) \ MnO_{4_{(aq)}}^{-} + H_2O_{2_{(aq)}} \to $
$(iii) \ CaO_{(s)} + H_2O_{(g)} \to $
$(iv) \ AlCl_{3_{(g)}} + H_2O_{(l)} \to $
$(v) \ Ca_3N_{2_{(s)}} + H_2O_{(l)} \to $
Classify the above into $(a)$ hydrolysis,$(b)$ redox and $(c)$ hydration reactions.

Which of the following is a poor conductor of electricity?