Redox Reactions...

The oxidation state of molybdenum in its oxo complex species$$ [Mo_2O_4(C_2H_4)_2(H_2O_2)]^{2-}]$$.

Which of the following reaction shows reduction of water? 

The oxidation number of $$Cr$$ in $$CrO_5$$ which has the following structure is:

Which of the following arrangements represent increasing oxidation number of the central atom ?

Which of the following is correct representation of a given molecular equation in ionic form?
$$K_2Cr_2O_7 + 7H_2SO_4 + 6FeSO_4 \rightarrow 3Fe_2(SO_4)_3 + Cr_2(SO_4)_3 + K_2SO_4 + 7H_2O$$

In the reaction : $$I_2+2S_2{ O }_{ 3 }^{ 2- }\rightarrow 2I^- +S_4{ O }_{ 6 }^{ 2- }$$?

What is the correct representation of reaction occurring when HCl is heated with $$MnO_2$$ ? 

What is the oxidation number of carbon in $$C_3O_2$$ (carbon suboxide )?

The standard reduction potential for the half-cell reaction, $$Cl_2+2e^-\rightarrow 2Cl^-$$ will be:
$$Pt^{2+}+2Cl^-\rightarrow Pt+Cl_2, E^o_{cell}=-0.15$$V;
$$Pt^{2+}+2e^-\rightarrow Pt, E^o=1.20$$V

Which of the following is the correct cell representation for the given cell reaction?
$$Zn+H_2SO_4\rightarrow ZnSO_4+H_2$$