In a flask, colourless N2O4(g) is in equilibrium with brown coloured NO2(g). At equilibrium when the flask is heated to 100C, the brown colour deepens and on cooling it becomes less coloured. Which statement is incorrect about this observation?
1. The H for the reaction N2O4(g) 2NO2(g) is +ve
2. Paramagnetism increases on heating
3. The H-U at 100C is equal to 200 cal
4. Dimerisation is reduced on heating
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyEnthalpy of the reaction,
CH4(g) + 1/2O2(g) CH3OH(l), is negative. If the enthalpy of combustion of CH4 and CH3OH are x and y respectively, then
which relation is correct?
1. x>y
2. x<y
3. x=y
4. xy
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the reaction, H and S both are positive. The condition under which the reaction would not be spontaneous is -
1. H>TS
2. S=H/T
3. H=TS
4. All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen an ideal gas is compressed adiabatically and reversibly, the final temperature is:
1. higher than the initial temperature
2. lower than the initial temperature
3. the same as the initial temperature
4. dependent on the rate of compression
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1 liter-atmosphere is equal to:
1. 101.3 J
2. 24.20 cal
3. 101.3 x 107 erg
4. All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe standard change is Gibbs energy for the reaction,
H2OH+ + OH- at 25C is:
1. 100 kJ
2. -90 kJ
3. 90 kJ
4. -100 kJ
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe entropy change in the fusion of one mole of a solid melting at 27C is -
(the latent heat of fusion is 2930 J mol-1)
1. 9.77 JK-1mol-1
2. 19.73 JK-1mol-1
3. 2930 JK-1mol-1
4. 108.5 JK-1mol-1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe maximum work done in expanding 16 g oxygen at 300 K and occupying a volume of 5 dm3 isothermally until the volume becomes 25 dm3 is:
1. 2.01 x 103 J
2. +2.81 x 103 J
3. 2.01 x 10-3 J
4. +2.01 x 10-6 J
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1 mole of an ideal gas at 25 is subjected to expand reversibly ten times of its initial volume. The change in entropy of expansion is:
1. 19.15 JK-1mol-1
2. 16.15 JK-1mol-1
3. 22.15 JK-1mol-1
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor the process
H2O(l) H2O(g)
at T=100C and 1 atmosphere pressure, the correct choice is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology