Combustion of a candle is
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Chemistry GK · all questionsThermochemistry
Thermochemistry
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Which law of the thermochemistry introduces the concept of entropy?
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Which of the following is a closed system?
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The entropy of perfectly crystalline solid at absolute zero is
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In the pressure cooker, cooking is fast because the increase in vapour pressure
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Food cans are coated with tin but not with zinc because
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If a reaction is carried out at constant pressure, which of the following statement is correct?
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The working of a dry cell is based on
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The electrochemical cell stops working after sometime because
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The life span of a Daniell cell may be increased by
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Match the List I with List II.
| List-I | List-II |
| a. Primary battery | 1. Reaction between Zn and Cu ions to produce an electric current |
| b. Secondary battery | 2. Change of chemical energy to electrical energy |
| c. Electrochemical cell | 3. Lead storage battery |
| d. Daniell cell | 4. Laclanche cell |
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In which of the following, the entropy decrease?
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The depolariser used in dry cell is
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Consider the following statements.
1. Galvanic cell converts chemical energy into electrical energy.
2. In a galvanic cell, the electron flow from anode to cathode through the external circuit.
3. Galvanic cell converts metal from its elemental state to the combined state.
Which of the statement(s) given above is/are correct?
1. Galvanic cell converts chemical energy into electrical energy.
2. In a galvanic cell, the electron flow from anode to cathode through the external circuit.
3. Galvanic cell converts metal from its elemental state to the combined state.
Which of the statement(s) given above is/are correct?
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On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compounds?
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Which of the following is/are state function/functions?
1. q + W
2. q
3. W
4. H - TS
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1. q + W
2. q
3. W
4. H - TS
Select the correct answer:
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For a certain reaction.
ΔG- = -45 kj/mol and ΔH- = -90 kj/mol at 0°C.
What is the minimum temperature at which the reaction will become spontaneous, assuming that ΔH- and ΔS- are independent of temperature?
ΔG- = -45 kj/mol and ΔH- = -90 kj/mol at 0°C.
What is the minimum temperature at which the reaction will become spontaneous, assuming that ΔH- and ΔS- are independent of temperature?
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On the basis of position in the electrochemical series, the metal which does not displace hydrogen from water and acid is
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Which statement is correct about the fusion of copper?
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A fan produces a feeling of comfort during hot weather, because
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