Stoichiometry MCQ Questions & Answers

21

The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the

A) Trouton's rule B) Kopp's rule C) Antonie equation D) Kistyakowsky equation

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Answer & Solution

Answer: Option B

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22

Equal masses of CH₄ and H₂ are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is

A) $$\frac{1}{9}$$ B) $$\frac{8}{9}$$ C) $$\frac{1}{2}$$ D) $$\frac{5}{9}$$

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Answer & Solution

Answer: Option B

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23

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour

A) Measures the elevation in boiling point B) Is not dependent on the temperature C) Is a function of the liquid phase composition D) Measures the depression in freezing point

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Answer & Solution

Answer: Option C

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24

An ideal gas can be liquified, because

A) Its molecular size is very small B) Its critical temperature is more than 0°C C) Forces operative between its molecules are negligible D) It gets solidified directly without becoming liquid

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Answer & Solution

Answer: Option C

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25

The value of the gas-law constant 'R' is 1.987

A) Kcal/kg-mole.°C B) Btu/lb-mole.°R C) Kcal/kg-mole.°K D) Both B & C

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Answer & Solution

Answer: Option D

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26

Volume occupied by one gm mole of a gas at S.T.P. is

A) 22.4 litres B) 22400 litres C) 22.4 c.c D) 359 litres

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Answer & Solution

Answer: Option A

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27

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

A) 6.023 x 10¹³ B) 6.023 x 10¹⁰ C) 6.023 x 10⁷ D) 10¹³

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Answer & Solution

Answer: Option C

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28

The density of a liquid is 1500 kg/m³. Its value in gin/litre will be equal to

A) 1.5 B) 15 C) 150 D) 1500

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Answer & Solution

Answer: Option D

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29

One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°₂₉₈ = -730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about

A) 0.19 B) 0.33 C) 0.40 D) 0.67

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Answer & Solution

Answer: Option A

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30

The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water X_w in the vapour phase satisfies

A) 0 < X_w < 0.5 B) X_w = 0.5 C) 0.5 < X_w < 1.0 D) X_w = 1.0

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Answer & Solution

Answer: Option C

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Stoichiometry MCQ Questions & Answers | Chemical Engineering