Question

Identify the IUPAC name for the coordination compound \( [Co(NH_3)_6]Cl_3 \).

• A. Hexaamminecobalt(II) chloride
• B. Hexaamminecobalt(III) chloride
• C. Hexaamminecobalt(IV) chloride
• D. Amminecobalt(III) chloride

Hint:

Neutral ligands such as \(NH_3\) and \(H_2O\) do not affect oxidation state calculations. Always determine the charge of the complex ion first to find the oxidation state of the metal.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
We need to find the transformation rule applied to the word "FRIEND" and apply the exact same rule to "CANDLE".
Step 2: Key Formula or Approach:
Map the alphabetical positions of the letters and determine the numerical shift for each position.
Step 3: Detailed Explanation:
Analyze "FRIEND" to "HUMJTK":
F (+2) \(\rightarrow\) H
R (+3) \(\rightarrow\) U
I (+4) \(\rightarrow\) M
E (+5) \(\rightarrow\) J
N (+6) \(\rightarrow\) T
D (+7) \(\rightarrow\) K
The logic is an increasing shift: \( +2, +3, +4, +5, +6, +7 \).
Now apply this to "CANDLE":
C (+2) \(\rightarrow\) E
A (+3) \(\rightarrow\) D
N (+4) \(\rightarrow\) R
D (+5) \(\rightarrow\) J
L (+6) \(\rightarrow\) R
E (+7) \(\rightarrow\) I
The resulting code is "EDRJRI".
Step 4: Final Answer:
The code for CANDLE is EDRJRI.