Match the column : Column I Column II A. PCT — NEET Chemistry Past Papers Chemistry Question

💡 Solution & Explanation

# Solution: Matching PCT **Step 1: Identify what PCT stands for** PCT = Percent Composition by mass (or Percentage Composition Theorem) **Step 2: Recall the formula for percent composition** % Composition = (Mass of element / Molar mass of compound) × 100 **Step 3: Understand when PCT is used** PCT is applied when: - Determining the mass percentage of each element in a compound - Calculating the relative proportions of elements in a substance - Converting between empirical and molecular formulas **Step 4: Key characteristic of PCT** PCT always results in percentages that sum to 100% for all elements in a compound, making it a fundamental stoichiometric calculation tool. **Step 5: Confirm the match** Column I (PCT) correctly matches with Column II because PCT represents the percentage composition calculation method used in chemistry to analyze compound composition. Therefore, the answer is A.