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Molar conductivity of substance “A” is 5.9 × 103 S/m and “B” is 1 × 10–16 S/m. Which of the two is most likely to be copper metal and why?
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Explain the following reaction:
Cannizzaro reaction
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Give reasons for the following statement:
Copper does not displace hydrogen from acids.
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What happens when methanal undergoes cannizzaro reaction?
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Which of the following solutions of KCl will have the highest value of molar conductivity?
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Assertion (A) : Conductivity decreases with decrease in concentration of electrolyte.
Reason (R) : Number of ions per unit volume that carry the current in a solution decreases on dilution.
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What happens when (CH3)3 C – OH is heated with Cu/573 K?
Write the chemical equation in support of your answer.
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Write the structures of A, B and C in the following reaction:
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Conductivity of 2 × 10−3 M methanoic acid is 8 × 10−5 S cm−1. Calculate its molar conductivity and degree of dissociation if `∧_"m"^0` for methanoic acid, is 404 S cm2 mol−3.
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Which of the following does not give Cannizzaro reaction?
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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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Which of the following alcohols will not undergo oxidation?
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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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Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent?
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Convert the following:
Benzene to m-nitrobenzaldehyde
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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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Write the mechanism of acid dehydration of ethanol to yield ethene.
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