Stoichiometry

311. The increase in the temperature of the aqueous solution will result in decrease of its

1. Weight % of the solute
2. Mole fraction of the solute
3. Molarity
4. Molality

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312. The latent heat of vaporisation

1. Decreases with increased temperature
2. Decreases as pressure increases
3. Becomes zero at the critical point
4. All (A), (B) & (C)

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313. The maximum adiabatic flame temperature of fuels in air is _________ the maximum flame temperature in pure oxygen.

1. Lower than
2. Higher than
3. Same as
4. Not related to

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314. The molar composition of a gas is 10% H₂, 10% O₂, 30% CO₂ and balance H₂O. If 50% H₂O condenses, the final mole percent of H₂ in the gas on a dry basis will be

1. 10%
2. 5%
3. 18.18%
4. 20%

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315. The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas).

1. √T
2. T
3. T2
4. 1/√T

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316. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _________ in the two phases.

1. Potential energy
2. Intermolecular forces
3. Kinetic energy
4. Total energy

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317. The most convenient way of expressing solution concentration is in terms of

1. Mole fraction
2. Normality
3. Molality
4. Molarity

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318. The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the

1. Temperature & pressure
2. Number of intermediate chemical reactions involved
3. State of aggregation & the state of combination at the beginning & the end of the reaction
4. None of these

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319. The number of atoms of oxygen present in 11.2 litres of ozone (O₃) at N.T.P. are

1. 3.01 × 10²²
2. 6.02 × 10²³
3. 9.03 × 10²⁴
4. 1.20 × 10²⁴

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320. The number of H+ in 1 c.c solution of pH 13 is

1. 6.023 × 1013
2. 6.023 × 1010
3. 6.023 × 107
4. 1013

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