The Question is from neet-chemistry , and it was created by the author Mr. S M HUSSAIN

Question

Which of the following has the highest equivalent weight?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Equivalent Weight
	**Related Topics**: Molar Mass, Acidity, Basicity, Redox Reactions
	**Prerequisites**: Understanding of molar mass, acid-base chemistry, and redox reactions.
## SOLUTION PATHWAY
**Given Information**:
	The given compounds are H₂SO₄, NaOH, KMnO₄, and CaCO₃.
	Equivalent weight is calculated as Molar Mass / n-factor.
**Method & Steps**:
	1.	Calculate the molar mass of each compound.
		Reasoning: Molar mass is required for calculating equivalent weight.
		Formula/Rule: Molar mass is the sum of atomic masses of all atoms in a molecule.
	2.	Determine the n-factor for each compound.
		Reasoning: n-factor represents the number of replaceable hydrogen ions (for acids), hydroxyl ions (for bases), or electrons transferred in a redox reaction.
		Working: For H₂SO₄, n-factor = 2 (dibasic acid). For NaOH, n-factor = 1 (monobasic base). For KMnO₄, n-factor = 5 (change in oxidation state of Mn from +7 to +2). For CaCO₃, n-factor = 2 (divalent metal).
	3.	Calculate the equivalent weight for each compound.
		Working: 
		H₂SO₄: Molar mass = 98 g/mol, Equivalent weight = 98/2 = 49 g/eq.
		NaOH: Molar mass = 40 g/mol, Equivalent weight = 40/1 = 40 g/eq.
		KMnO₄: Molar mass = 158 g/mol, Equivalent weight = 158/5 = 31.6 g/eq.
		CaCO₃: Molar mass = 100 g/mol, Equivalent weight = 100/2 = 50 g/eq.
	4.	Compare the equivalent weights and identify the highest one.
		Result: CaCO₃ has the highest equivalent weight (50 g/eq).
		Verification: The calculations are correct and comparable.
## OPTION ANALYSIS
[A] :x: H₂SO₄ has an equivalent weight of 49 g/eq.
[B] :x: NaOH has an equivalent weight of 40 g/eq.
[C] :x: KMnO₄ has an equivalent weight of 31.6 g/eq.
[D] ✓: CaCO₃ has the highest equivalent weight of 50 g/eq.
## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Incorrectly calculating the n-factor. [How to avoid]: Understand the definition of n-factor for acids, bases, and redox reactions.
		2.[Error 2]: Using the wrong molar mass. [How to avoid]: Double-check the atomic masses and the molecular formula.
	**Quick Tips**:
		1.[Helpful shortcut]: Remember that for acids, n-factor equals the number of replaceable H+ ions, and for bases, it equals the number of replaceable OH- ions.
		2.[Memory aid]: The equivalent weight is always less than or equal to the molar mass.

Mr. S M HUSSAIN · Answer

H₂SO₄ (Sulfuric acid)

Mr. S M HUSSAIN · Answer

NaOH (Sodium hydroxide)

Mr. S M HUSSAIN · Answer

KMnO₄ (Potassium permanganate)

Mr. S M HUSSAIN · Answer

The correct Option is "CaCO₃ (Calcium carbonate)"

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