Alcohols, Phenols and Ethers — Chemistry STD 12 Science — Question

1. Complete the following chemical reaction equations:

i. $\text{MnO}_{4(aq)}^{-}+\text{C}_{2}\text{O}_{4(aq)}^{2-}+\text{H}^{+}_{(aq)}\rightarrow$

ii. $\text{Cr}_{2}\text{O}_{7(aq)}^{2-}+\text{Fe}^{2+}_{(aq)}+\text{H}_{(aq)}^{+}\rightarrow$

2. Explain the following observations about the transition/inner transition elements:

1. There is in general an increase in density of element from titanium (Z=22) to copper (Z=29).
2. There occurs much more frequent metal-metal bonding in compounds of heavy transition elements (3rd series).
3. The members in the actinoid series exhibit a larger number of oxidation states than the corresponding members in the lanthanoid series.

1. Complete the following equations:

1. $\text{Cr}_{2}\text{O}_{7}^{2-}+\text{2OH}^{-}\rightarrow$
2. $\text{MnO}_{4}^{-}+\text{4H}^{+}+\text{3e}^{-}\rightarrow$

2. Account for the following:

1. Zn is not considered as a transition element.
2. Transition metals form a large number of complexes.
3. The E^o value for the Mn³⁺/Mn²⁺ couple is much more positive than that for Cr³⁺/Cr²⁺ couple.