Hard Chemistry Chapter 01: Solutions Class 12 Level 4

चार सौ मिलीलीटर शून्य दशमलव पाँच मोलर विलयन को आठ सौ मिलीलीटर तक पतला किया गया। नई मोलरता क्या होगी?

400 mL of 0.5 M solution is diluted to 800 mL. What is the new molarity?

Explanation opens after your attempt
Correct Answer

B. 0.25 मोलर / 0.25 M

Step 1

Concept

In dilution, moles of solute do not change, so molarity changes inversely with volume.

Step 2

Why this answer is correct

The volume is doubled, so molarity becomes half, 0.25 M.

Step 3

Exam Tip

For a quick solution, check the volume change ratio. चरण 1: पतला करने में विलेय के मोल नहीं बदलते, इसलिए मोलरता आयतन के उलट बदलती है। चरण 2: आयतन दोगुना हुआ है, इसलिए मोलरता आधी होकर शून्य दशमलव पच्चीस मोलर होगी। चरण 3: तेज हल के लिए आयतन परिवर्तन का अनुपात देखें।

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What is the correct answer to this Chemistry MCQ?

The correct answer is B. 0.25 मोलर / 0.25 M.

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