Stoichiometry

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

1. Heat of solvation
2. Heat of hydration
3. Standard integral heat of solution
4. Heat of mixing

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

1. Vapor to liquid
2. Vapor to solid
3. Solid to liquid
4. One allotropic form to another allotropic form

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153. Hess's law of constant heat summation is based on conservation of mass. It deals with

1. Equilibrium constant
2. Reaction rate
3. Changes in heat of reaction
4. None of these

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154. High porosity refractory bricks have

1. Poor resistance to the penetration of molten slag, metal & flue gases
2. Poor heat conductivity & low strength
3. Better thermal spalling resistance
4. All (A), (B) and (C)

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155. Hot metal runner in blast furnace are lined with _________ bricks.

1. Silica
2. Carborundum
3. Fireclay
4. Magnesite

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156. How many phases are present at eutectic point?

1. 2
2. 1
3. 3
4. unpredictable

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157. How much O₂ can be obtained from 90 kg of water?

1. 32 kg
2. 80 kg
3. 64 kg
4. 90 kg

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158. Ideal solution is formed, when its components have zero

1. Heat of mixing
2. Volume change
3. Both (A) & (B)
4. Neither (A) nor (B)

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159. If 1 Nm³ of O₂ contains 'N' number of molecules, then number of molecules in 2Nm³ of SO₂ will be

1. N
2. N/2
3. 2N
4. 4N

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160. If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27) used in this reaction is _________ gm.

1. 27
2. 54
3. 5.4
4. 2.7

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