Question 91. Integral enthalpy of mixing (in J/mol) of liquid (Cu, Zn) solution can be approximated by âˆ†Hmixm = -19250 xCu xZnAssuming regular solution behaviour, the solution parameter (in J/mol) is

Question 92. Integral enthalpy of mixing (in J/mol) of liquid (Cu, Zn) solution can be approximated by âˆ†Hmixm = -19250 xCu xZnThe corresponding partial molar enthalpy of mixing (in J/mol) for Cu is

Question 93. Ladle deoxidation of liquid steel is done at 1600°C by adding ferro-aluminium. By assuming Stokes law behaviour, time (in s) required for alumina particles of 50 μm diameter to float to the surface from a depth of 2 m would be__________ [Given: density of steel = 7000 kg/m3, density of alumina = 3650 kg/m3,
viscosity of steel = 6 * 10-3 kg/m/s]

Question 94. Abhishek is elder to Savar. Savar is younger to Anshul. Which of the given conclusions is logically valid and is inferred from the above
statements?

Question 95. If |4X - 7| = 5 then the values of 2|X| - |-X| is:

Question 96. A firm is selling its product at Rs. 60 per unit. The total cost of production is Rs. 100 and firm is
earning total profit of Rs. 500. Later, the total cost increased by 30%. By what percentage the price
should be increased to maintained the same profit level.

Question 97. When two phases α and β in an alloy are in thermodynamic equilibrium, then

Question 98. In a roasting process, the set of conditions that favour sulphate formation from metal sulphide
concentrates are P. high temperature Q. high partial pressure of oxygen R. use of excess air S. high partial pressure of SO3

Question 99. Which one of the following can give information about the corrosion rate?

Question 100. In the Ellingham diagram for oxides, C-CO line cuts the M-MO line at temperature T1 and the
M²-M²O line at a higher temperature T2. At a temperature greater than T1 and less than T2, carbon
can reduce