The occurrence of a reaction is impossible if -
1. ΔH is +ve ; ΔS is also + ve but ΔH < TΔS
2. ΔH is – ve ; ΔS is also – ve but ΔH > TΔS
3. ΔH is – ve ; ΔS is + ve
4. ΔH is + ve ; ΔS is – ve
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The unit of entropy is -
1. J mol–1
2. JK mol–1
3. J mol–1 K–1
4. J–1 K–1 mol–1
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Combustion of glucose takes place according to the equation,
,
Energy required for the production of 1.6 g of glucose is -
(Molecular mass of glucose = 180 g)
1. 0.064 kcal
2. 0.64 kcal
3. 6.4 kcal
4. 64 kcal
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When a gas undergoes adiabatic expansion, it gets cooled due to -
1. Loss of energy
2. Fall in pressure
3. Decrease in velocity
4. Increase in energy with work done
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A Beckmann thermometer is used to measure -
1. High temperature
2. Low temperature
3. Normal temperature
4. All temperatures
Which plot represents an exothermic reaction?
1.
2.
3.
4.
For the reaction
\(C H_{3} C O O H \left(\right. l \left.\right) + 2 O_{2} \left(\right. g \left.\right) \)
\(\rightleftharpoons 2 C O_{2} \left(\right. g \left.\right) + 2 H_{2} O \left(\right. l \left.\right)\)
at 25°C and 1 atm. pressure, ΔH = –874 kJ. The change in internal energy (ΔE) is -
1. – 874 kJ
2. – 971.53 kJ
3. + 971.53 kJ
4. + 874 kJ
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The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 liters to 20 liters at 25°C is -
1.
2.
3.
4.
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Which of the following is not a state function?
1. | ΔS | 2. | ΔG |
3. | ΔH | 4. | ΔQ |
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