Stoichiometry

351. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies

1. X_M < 0.5
2. X_M = 0.5
3. 0.5 < X_M < 0.64
4. XM ≥ 0.64

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352. Thermal conductivity of refractory bricks

1. Increases with decrease in porosity
2. Decreases with decreases in porosity
3. Is independent of its porosity and is maximum for insulating bricks
4. Increases with the amount of air entrapped in pores

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353. Thermal diffusivity of a refractory brick is high, when its _________ is high.

1. Density
2. Specific heat
3. Thermal conductivity
4. None of these

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354. Total energy at a point comprises of _________ energy.

1. Potential & kinetic
2. Pressure
3. Internal
4. All (A), (B) & (C)

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355. Two solutions A₁ and A₂ have pH value of 2 and 6 respectively. It implies that the solution

1. A₂ is more alkaline than solution A₂
2. A₁ is highly acidic
3. A₁ is very slightly acidic
4. Both (A) & (C)

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356. Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the _________ of different gases are nearly the same.

1. Compressibility
2. Molecular weight
3. Humidity
4. None of these

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357. Unit of mass velocity is

1. kg/m.hr
2. kg/m².hr
3. kg/hr
4. kg/m²

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358. Unit of power is

1. Joule
2. Watt
3. Joule/Second
4. Both (B) & (C)

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359. Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules

1. Do not lose energy on collision
2. Are above the inversion temperature
3. Do not exert attractive force on each other
4. Do work equal to loss in kinetic energy

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360. Validity of the relationship, inputs = outputs, holds good for the system at steady state

1. With chemical reaction
2. Without chemical reaction
3. Without chemical reaction & losses
4. None of these

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