Class NEET 2026 ALL Q #1969
KNOWLEDGE BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
In potash alum, the ratio of $K^{+}$ and $SO_{4}^{2-}$ ions is
(A) 3:02
(B) 1:02
(C) 2:01
(D) 2:03
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Correct Answer: B

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Detailed Solution

Step 1: Identify the Chemical Formula

Potash alum is a double salt with the chemical formula KAl(SO4)2 · 12H2O. In its dissociated form in an aqueous solution, it breaks down into its constituent ions.

Step 2: Dissociation of the Salt

The dissociation reaction is represented as: $$KAl(SO_{4})_{2} \cdot 12H_{2}O \rightarrow K^{+} + Al^{3+} + 2SO_{4}^{2-} + 12H_{2}O$$

Step 3: Determine the Ion Ratio

From the balanced dissociation equation, we observe that for every 1 mole of potash alum, there is 1 mole of K+ ions and 2 moles of SO42- ions. Therefore, the ratio of K+ to SO42- is 1:2.

Final Answer: 1:2

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must recall the chemical formula of a specific double salt and apply the concept of ionic dissociation to determine stoichiometric ratios.
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific chemical nomenclature and the composition of a standard inorganic compound.
Syllabus Audit: In the context of NEET, this is classified as KNOWLEDGE. This question assesses the foundational understanding of inorganic chemistry and salt composition, which is essential for the P-block and Coordination Chemistry units.

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