In the 3d block elements, the elements show a wide range of oxidation states. Let us analyze the oxidation states of the elements listed:
(A) Titanium (Ti):
Titanium typically exhibits oxidation states of +2, +3, and +4. It does not exhibit the +5, +6, or +7 oxidation states.
(B) Vanadium (V):
Vanadium can exhibit oxidation states of +2, +3, +4, and +5. It does not show +6 or +7 oxidation states.
(C) Chromium (Cr):
Chromium shows +2, +3, +6 oxidation states, but it does not exhibit +4, +5, or +7 oxidation states.
(D) Manganese (Mn):
Manganese is known for exhibiting a wide range of oxidation states, including +2, +3, +4, +5, +6, and +7.
Therefore, manganese is the correct answer.
(E) Iron (Fe):
Iron exhibits oxidation states of +2 and +3 but does not show +4, +5, +6, or +7 oxidation states.
Thus, the correct answer is option (D), Manganese.
In the Carius method of estimation of halogen, 0.4g of an organic compound gave 0.188g of AgBr. What is the percentage of bromine in the organic compound? (The atomic mass of Ag = 108 g mol\(^{-1}\) & Br = 80 g mol\(^{-1}\))
For the reaction:
\[ 2A + B \rightarrow 2C + D \]
The following kinetic data were obtained for three different experiments performed at the same temperature:
\[ \begin{array}{|c|c|c|c|} \hline \text{Experiment} & [A]_0 \, (\text{M}) & [B]_0 \, (\text{M}) & \text{Initial rate} \, (\text{M/s}) \\ \hline I & 0.10 & 0.10 & 0.10 \\ II & 0.20 & 0.10 & 0.40 \\ III & 0.20 & 0.20 & 0.40 \\ \hline \end{array} \]
The total order and order in [B] for the reaction are respectively: