Chemical Engineering · all questions

Stoichiometry
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Q1

A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca : 40, Na : 23, C : 12, O : 16)

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Q2

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.

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Q3

The total number of atoms in 8.5 gm of NH₃ is __________ × 10²³.

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Q4

Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?

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Q5

Number of gm moles of solute dissolved in 1 kg of solvent is called its

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Q6

If pH value of a solution is 8, then its pOH value will be

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Q7

Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the

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Q8

For estimation of heat capacity of a solid compound, one can use

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Q9

Dissolving a solute in a solvent does not change its

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Q10

Pick out the wrong statement.

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Q11

Heat of transition is the heat evolved or absorbed, when a substance is converted from

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Q12

__________ fuels require the maximum percentage of 'excess air' for complete combustion.

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Q13

Atomic __________ of an element is a whole number.

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Q14

A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal

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Q15

The vapour pressure of water is given by, in P_sat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately

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Q16

An equation for calculating vapour pressure is given by, log₁₀ P = A - B(t + c). This is called the

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Q17

The combustion equations of carbon and carbon monoxide are as follows:
C + O₂ = CO₂, ΔH = -394 kJ/kg.mole
CO +

\frac{1}{2}

O₂ = CO₂, ΔH = -284.5 kJ/kg.mole
The heat of formation of CO is __________ kJ/kg.mole.

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Q18

In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the

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Q19

Density of carbon dioxide is __________ kg/Nm³.

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Q20

Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of

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