Stoichiometry

31. 1 torr is equal to _________ mm Hg column.

1. 1
2. 0.1
3. 10
4. 1000

View answer

32. 1 torr is equivalent to

1. 1 mm Hg
2. 1 Pascal
3. 1 atm
4. 1 mm wc

View answer

33. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is

1. 43862
2. 43891
3. 43922
4. 43892

View answer

34. 500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be _________ mm Hg.

1. 650
2. 700
3. 600
4. 375

View answer

35. 6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H₂ produced will be _________ gm.

1. 0.5
2. 1
3. 3
4. 5

View answer

36. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H₂O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is

1. 0
2. 0.18
3. 0.24
4. 1

View answer

37. A 'limiting reactant' is the one, which decides the _________ in the chemical reaction.

1. Equilibrium constant
2. Conversion
3. Rate constant
4. None of these

View answer

38. A butane isomerisation process produces 70 k.mole/hr of pure iso-butane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be

1. 3 kmole/hr
2. 4 kmole/hr
3. 5 kmole/hr
4. 6 kmole/hr

View answer

39. A bypass stream in a chemical process is useful, because it

1. Facilitates better control of the process
2. Improves the conversion
3. Increases the yield of products
4. None of these

View answer

40. A car tyre of volume 0.057 m³ is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is

1. 380
2. 630
3. 760
4. 880

View answer