Stoichiometry

131. Fireclay refractories

1. Are not resistant to the action of basic slags
2. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc
3. Shrink during firing
4. All (A), (B) and (C)

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132. For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become

1. P/3
2. 3P
3. 9P²
4. 9P

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133. For a neutral solution (pH = 7), the value of [H+] [OH-] is equal to

1. 0
2. 1
3. < 1
4. > 1

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134. For a reaction, X → Y, if the concentration of 'X' is tripled; the rate becomes nine times. The order of reaction is

1. 0
2. 1
3. 2
4. 3

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135. For an ideal gas, the compressibility factor

1. Decreases with pressure rise
2. Is unity at all temperature
3. Is unity at Boyle's temperature
4. Zero

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136. For an ideal solution, the total vapor pressure varies _________ with the composition (expressed as mole fraction).

1. Inversely
2. Exponentially
3. Linearly
4. Negligibly

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137. For any system, the _________ heat of solution is dependent on the temperature and the adsorbate concentration.

1. Integral
2. Differential
3. Both (A) & (B)
4. Neither (A) nor (B)

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

1. Clapeyron's equation
2. Gibb's equation
3. Kopp's rule
4. Trouton's rule

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139. For most salts, the solubility increases with rise in temperature, but the solubility of _________ is nearly independent of temperature rise.

1. Sodium chloride
2. Sodium carbonate monohydrate
3. Anhydrous sodium sulphate
4. Hypo

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140. For the gaseous phase reaction, N₂ + O₂ ⇌ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by

1. Increasing the concentration of N₂
2. Decrease in temperature
3. Increase in pressure
4. Decrease in pressure

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