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Assertion (A): Molar conductivity decreases with increase in concentration.
Reason (R): When concentration approaches zero, the molar conductivity is known as limiting molar conductivity.
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For the pair phenol and cyclohexanol, answer the following:
Give one chemical test to distinguish between the two.
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How can phenol be prepared from anisole? Give reaction.
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The following questions are case-based questions. Read the passage carefully and answer the questions that follow:
| Rahul set up an experiment to find the resistance of aqueous KCl solution for different concentrations at 298 K using a conductivity cell connected to a Wheatstone bridge. He fed the Wheatstone bridge with a.c. power in the audio frequency range 550 to 5000 cycles per second. Once the resistance was calculated from the null point, he also calculated the conductivity K and molar conductivity ∧m and recorded his readings in tabular form. |
| S. No. | Conc. (M) |
k S cm−1 | ∧m S cm2 mol−1 |
| 1. | 1.00 | 111.3 × 10−3 | 111.3 |
| 2. | 0.10 | 12.9 × 10−3 | 129.0 |
| 3. | 0.01 | 1.41 × 10−3 | 141.0 |
Answer the following questions:
(a) Why does conductivity decrease with dilution? (1)
(b) If `∧_"m"^0` of KCl is 150.0 S cm2 mol−1, calculate the degree of dissociation of 0.01 M KCI. (1)
(c) If Rahul had used HCl instead of KCl then would you expect the ∧m values to be more or less than those per KCl for a given concentration? Justify. (2)
OR
(c) Amit a classmate of Rahul repeated the same experiment with CH3COOH solution instead of KCl solution. Give one point that would be similar and one that would be different in his observations as compared to Rahul. (2)
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The unit of molar conductivity is ______.
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Which of the following solutions will have the highest conductivity at 298 K?
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Write the name of the reaction, structure and IUPAC name of the product formed when:
Phenol reacts with CHCl3 in the presence of NaOH followed by hydrolysis.
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Explain why Grignard reagents should be prepared under anhydrous conditions.
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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What is the basicity of \[\ce{H3PO4}\]?
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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What is the basicity of H3PO4?
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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What is the basicity of \[\ce{H3PO4}\]?
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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Explain why Grignard reagents should be prepared under anhydrous conditions?
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What is the basicity of \[\ce{H3PO4}\]?
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