Class NEET 2026 ALL Q #1948
COMPETENCY BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
The formula of tetraammineaquachloridocobalt(III) chloride is
(A) $[Co(NH_{3})_{4}(H_{2}O)Cl]Cl_{2}$
(B) $[Co(NH_{3})_{4}Cl_{2}]Cl\cdot H_{2}O$
(C) $[Co(NH_{3})_{4}]Cl_{3}\cdot H_{2}O$
(D) $[Co(NH_{3})_{4}(H_{2}O)Cl]Cl$
Prev Next
Correct Answer: A

AI Tutor Explanation

Powered by Gemini

Detailed Solution

Step 1: Identify the central metal and oxidation state

The central metal is Cobalt (Co) with an oxidation state of +3. This is indicated by (III) in the name.

Step 2: Identify the ligands and their charges

The ligands are:

  • Tetraammine: 4 $NH_{3}$ (neutral, charge = 0)
  • Aqua: 1 $H_{2}O$ (neutral, charge = 0)
  • Chlorido: 1 $Cl^{-}$ (anionic, charge = -1)

Step 3: Calculate the charge of the coordination sphere

The total charge of the complex ion is the sum of the metal oxidation state and the charges of the ligands: $$Charge = (+3) + 4(0) + 1(0) + 1(-1) = +2$$ Thus, the coordination sphere is $[Co(NH_{3})_{4}(H_{2}O)Cl]^{2+}$.

Step 4: Balance with counter ions

Since the complex ion has a charge of +2, we need two chloride ions ($Cl^{-}$) outside the coordination sphere to balance the charge. The formula is $[Co(NH_{3})_{4}(H_{2}O)Cl]Cl_{2}$.

Final Answer: [Co(NH_{3})_{4}(H_{2}O)Cl]Cl_{2}

AI Suggestion: Option A

AI generated content. Review strictly for academic accuracy.

Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must translate IUPAC nomenclature rules into a chemical formula by applying coordination chemistry principles.
Knowledge Dimension: PROCEDURAL
Justification: The student follows a specific algorithmic process (identifying ligands, calculating oxidation states, and balancing charges) to derive the correct chemical formula.
Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. IUPAC nomenclature of coordination compounds is a high-frequency topic in the NEET chemistry syllabus, requiring precision in applying rules of coordination chemistry.

More from this Chapter

MCQ_SINGLE
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Generally, 3d transition metals have high melting points. Reason R: Involvement of 3d-electrons in addition to 3s-electrons in the interatomic metallic bonding. In light of the above statements, choose the most appropriate answer from the options given below:
MCQ_SINGLE
Match List-I with List-II. List-I: A. Fusion of protoplasms between gametes B. Fusion of two nuclei C. Generation of haploid spores List-II: I. Meiosis II. Plasmogamy III. Karyogamy Choose the correct answer from the options given below:
MCQ_SINGLE
Consider the following statements about the solutions formed by mixing two liquids. A. An ideal solution thus formed obeys Raoult's law throughout the composition range. B. Mixture of chloroform and acetone shows negative deviation from Raoult's law. C. Mixture of aniline and phenol shows positive deviation from Raoult's law. Choose the correct option:
MCQ_SINGLE
A conducting loop of finite resistance lies on the $x-y$ plane. There is a constant magnetic field in the z direction. The area of the loop varies with time t, as $A=A_{0}(1+\sin t)$ in appropriate units. The figure that correctly indicates the qualitative behaviour of the power P dissipated in the loop as a function of time is: [Image Placeholder]
MCQ_SINGLE
Given below are two statements: Statement I: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. Statement II: In phylum Echinodermata, both adults and larvae are radially symmetrical. In the light of the above statements, choose the most appropriate answer from the options given below:
View All Questions