Question 31. 1 BTU/lb.←°F is equivalent to __________ kcal/kg.°C.

Question 32. PH value of an alkaline solution is

Question 33. A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct?

Question 34. A solution with reasonably permanent pH is called a/an __________ solution.

Question 35. A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to

Question 36. Heat of solution in a system in which both solute and solvent are liquids is termed as

Question 37. Mass number of an atom is the sum of the numbers of

Question 38. Pick out the wrong statement:

Question 39. At standard conditions, N₂ + 2O₂ ⇋ 2NO₂; ΔG° = 100 kJ/moleNO + ½O₂ ⇋ 2NO₂; ΔG° = -35 kJ/moleThe standard free energy of formation of NO in kJ/mole is

Question 40. The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.