What is corrosion ? What are the factors which affect corrosion? `CO_(2)` is always present in natural water.
Explain its effect (increases, stops or no effect on rusting of iron.

what is corrosion? Describe the role of zinc in cathodic protection of iron can we use tin in place of zinc ?Explain.

What is lanthanoid contraction? Explain its causes and effects.

What is biomagnification ? Explain its ill effect.

What is the effect of increasing conc. Of Zn^(2+)//Zn electrode?

What is the role of CO_2 in the greeenhouse effect ?

The chemistry of corrosion of iron is essentially an electrochemical phenomenon. Explain the reactions occurring during the corrosion of iron in the atmosphere. Suggest two materials other than hydrogen that can be used as fuels in fuel cells. The molar conductivity of 0.025 "mol L"^(-1) , methanoic acid is 46.1 scm^(2)"mol"^(-1) . Calculate its degree of dissociation and dissociation constant.

Iron may be protected from rusting by coating with zinc or tin. By referring to the data given below, explain why zinc protect iron more effectively than tin? Zn^(2+) + 2e^(-) rarr Zn, E^(@) = - 0.76 V Fe^(2+) + 2e^(-) rarr Fe, E^(@) = - 0.44V Sn^(2+) + 2e^(-) rarr Sn , E^(@) = - 0.14V

If earth suddenly stops rotating about it’s axis what would be the effect on g ? Would this effect be the same at all places- ?