Chemical Engineering · all questions

Stoichiometry
practice.

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Q241

1 BTU/lb.←°F is equivalent to __________ kcal/kg.°C.

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Q242

A solution with reasonably permanent pH is called a/an __________ solution.

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Q243

A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are X_c and X_s respectively. Which of the following statement is correct?

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Q244

pH value of an alkaline solution is

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Q245

A very dilute solution is prepared by dissolving 'x₁' mole of solute in 'x₂' mole of a solvent. The mole fraction of solute is approximately equal to

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Q246

Heat of solution in a system in which both solute and solvent are liquids is termed as

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Q247

Mass number of an atom is the sum of the numbers of

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Q248

At standard conditions,
N₂ + 2O₂ ⇋ 2NO₂; ΔG° = 100 kJ/mole
NO +

\frac{1}{2}

O₂ ⇋ 2NO₂; ΔG° = -35 kJ/mole
The standard free energy of formation of NO in kJ/mole is

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Q249

Pick out the wrong statement:

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Q250

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

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Q251

1 gm mole of methane (CH₄) contains

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Q252

N₂ content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (molecular weight of urea = 60)

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Q253

Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is

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Q254

__________ equation gives the effect of temperature on heat of reaction.

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Q255

For the gaseous phase reaction, N₂ + O₂ ⇋ 2NO, ΔH = + 80 kJ/kg.mole; the decomposition of NO is favoured by

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Q256

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

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Q257

For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become

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Q258

For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).

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Q259

N.T.P. corresponds to

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Q260

Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.

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