Stoichiometry

121. Elements in a periodic table are arranged in order of their

1. Atomic number
2. Mass number
3. Atomic weight
4. Metallic characteristics

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122. 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

1. Mixing
2. Adsorption
3. Wetting
4. Complete wetting

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123. Enthalpy of a vapor gas mixture may be increased by increasing the

1. Temperature at constant humidity
2. Humidity at constant temperature
3. Temperature and the humidity
4. All (A), (B) & (C)

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124. Enthalpy of formation of NH₃ is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH₃ → N2 + 3H₂, is equal to _________ kJ/kg. mole.

1. 46
2. 92
3. -23
4. -92

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125. 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

1. 44075
2. 44082
3. 43862
4. 44079

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126. Except for monatomic gases, the molal heat capacity at constant volume for all gases is _________ Kcal/Kg mole.° K.

1. 3
2. > 3
3. < 3
4. < 1

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127. Faster rate of drying of moulded refractories results in high _________ of refractories.

1. Green strength
2. Voids
3. Shrinkage
4. Both (B) and (C)

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128. Fireclay bricks are not used in the

1. Beehive coke oven
2. By-product coke oven walls
3. Combustion chamber of B.F. stoves
4. Coke oven regenerators

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129. Fireclay bricks are used in the

1. Coke ovens regenerator
2. Outer lining of L.D. converter
3. Hearth bottom of blast furnace
4. Coke oven walls

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130. Fireclay bricks is not used for lining the

1. Cupola
2. Gas producer
3. Bottom of hot metal mixer
4. Roof of open hearth furnace

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