Stoichiometry

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

1. Trouton's rule
2. Kopp's rule
3. Antoine equation
4. Kistyakowsky equation

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302. The heat capacity of a substance is

1. Greater for liquid state than for solid state
2. Lower for liquid state than for gaseous state
3. Higher for solid state than for liquid state
4. Equal for solid and liquid states below melting point

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303. The heat capacity of most substances is greater for the _________ state.

1. Solid
2. Liquid
3. Gaseous
4. None of these

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304. The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of

1. Formation
2. Solution
3. Combustion
4. Fusion

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305. The heat evolved in the combustion of benzene is represented by the equation: C₆H₆ + 7.5 O₂ = 6CO₂ + 3H₂O, Δ#916;H = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C₆H₆ is burnt in an open container, will be _________ kJ/kgmole.

1. 816.15
2. 1632.3
3. -1632.3
4. -2448.45

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306. The heat of adsorption of a gas caused by Van der Waals forces of attraction and capillarity is equal to the heat of

1. Normal condensation
2. Wetting
3. Sum of (A) and (B)
4. Difference of (A) and (B)

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307. The heat of solution depends upon the

1. Nature of solvent
2. Concentration of solution
3. Nature of solute
4. All (A), (B) & (C)

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308. The heat of vaporisation _________ with increase in pressure.

1. Increases
2. Decreases
3. Becomes zero at critical pressure
4. Both (B) and (C)

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309. The heats of vaporisation of CS₂, C₂H₅OH &H₂O are 26.8, 38.6 & 40.6 KJ/kg.mole respectively. The order of decreasing inter-molecular forces in these liquids is

1. H₂O > C₂H₅OH > CS₂
2. CS2 > C₂H₅OH > H₂O
3. H₂O > CS₂ > C₂H₅OH
4. CS2 > H₂O > C₂H₅OH

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310. The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be

1. 10^-11
2. 10^-10
3. 10^-3
4. 10^-4

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