57 + Mcqs in Material Balances in Chemical Engineering Page 1 McqOptions

1.	Solution-1 containing 30% acetic acid and 20% nitrogen at the rate F combines with Solution-2 containing 20% acetic acid and 10% nitrogen at the rate D and Solution-3 containing 10% acetic acid and 30% nitrogen at the rate N the product formed contains 20% acetic acid at the rate P, what is the percentage of nitrogen in product?
A.	0.1
B.	0.2
C.	0.3
D.	Cannot be determined
Answer» E.

Discussion

2.	CH4 at the rate 10 mole/min is reacted with O2 at the rate 10 mole/min, what is the rate of formation of CO2 in the product?
A.	5 mole/min
B.	10 mole/min
C.	20 mole/min
D.	40 mole/min
Answer» B. 10 mole/min

Discussion

3.	An aqueous solution with sulfur 10 g/L at the rate is 100 L/min and an organic compound with no sulfur at the rate 50 L/min were put into an extraction machine and produced an aqueous solution with sulfur 1 g/L, what is the amount of sulfur in the organic compound after extraction?
A.	2 g/L
B.	5 g/L
C.	9 g/L
D.	15 g/L
Answer» D. 15 g/L

Discussion

4.	CH4 at the rate 10 mole/min is reacted with O2 at the rate 30 mole/min, what is the rate of formation of CO2 in the product?
A.	5 mole/min
B.	10 mole/min
C.	20 mole/min
D.	40 mole/min
Answer» C. 20 mole/min

Discussion

5.	Solution-1 containing 20% w1 and w2 at the rate 10 Kg/min combines with Solution-2 containing 10% w1, 20% w2 and w3 at the rate 20 Kg/min, the product formed contains and 10% w1, 30% w2 and 20% w3, what is the percentage of w2 in solution-1?
A.	0.05
B.	0.1
C.	0.25
D.	0.5
Answer» E.

Discussion

6.	There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of a substance in the system?
A.	10
B.	12
C.	15
D.	18
Answer» C. 15

Discussion

7.	In a random reaction 2 mole of CH4 and 1 mole of C2H4 are reacted, and 1 mole of C3H8 and 1 mole of CxHy are produced, what is x*y?
A.	2
B.	4
C.	8
D.	12
Answer» C. 8

Discussion

8.	10 moles of A were present in a system initially, and 10 moles of C are added to it, it follows the reaction 2A + C -> 5B, what is the number of moles of B produced?
A.	5
B.	10
C.	25
D.	50
Answer» D. 50

Discussion

9.	There were 15 moles of a substance present initially in a system, 25 moles were added to it and a reaction occurred so that its moles are reduced by 50%, what are the final moles of a substance in the system?
A.	10
B.	15
C.	20
D.	40
Answer» D. 40

Discussion

10.	400 g of CaSO4 is dissolved with 500 g of H2O, if 226 g of CaSO4.5H2O crystallizes out, then what is the percentage of CaSO4 in the remaining solution?
A.	0.3916
B.	0.5154
C.	0.6228
D.	0.7567
Answer» B. 0.5154

Discussion

11.	10 moles of O2 is added to 10 moles of H2, how many moles of H2O will it produce?
A.	5
B.	10
C.	15
D.	20
Answer» C. 15

Discussion

12.	A combustion reaction has reactants 1 mole of CxHy and 2 moles of O2 and products 1 mole of CO2 and 2 mole of H2O, what is x + y?
A.	1
B.	3
C.	4
D.	5
Answer» E.

Discussion

13.	A reaction has reactants 2 moles of NaOH and 1 mole of H2SO4, and products Na2SO4 and H2O, what are the total moles of products?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

14.	What is the accumulation in the system after 4 second if the out flow and in flow rates are 3 g/s and 8 g/s?
A.	12 g
B.	20 g
C.	32 g
D.	40 g
Answer» C. 32 g

Discussion

15.	The flow in rate of A is 8 mole/s, it undergoes a reaction 3A -> B, what are the moles of B that comes out after 6 seconds?
A.	5
B.	8
C.	10
D.	16
Answer» E.

Discussion

16.	The flow in rate of A is 5 mole/s, it undergoes a reaction A -> 2B, what are the moles of B that comes out after 5 seconds?
A.	5
B.	10
C.	25
D.	50
Answer» E.

Discussion

17.	A reactor has two feed streams with the ratio of their rate as 1:9 and has O2 and O3 with the mass fraction of 0.6 and 0.4 in stream 1 and 0.2 and 0.8 in stream 2, what is the mass fraction of O2 in the product side?
A.	0.24
B.	0.48
C.	0.72
D.	0.96
Answer» B. 0.48

Discussion

18.	An unsteady state system, the flow in rate of A is 10 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 2 seconds?
A.	5 mole/s
B.	10 mole/s
C.	15 mole/s
D.	20 mole/s
Answer» B. 10 mole/s

Discussion

19.	A reactor has feed of two streams, stream 1 has CO2 and H2O with mass fraction of 0.4 and 0.6 and rate 10 kg/hr, and stream 2 has CO2 and H2O with mass fraction 0.1 and 0.9 and rate 40 Kg/hr, what the mass fraction of CO2 in the product stream?
A.	0.08
B.	0.16
C.	0.24
D.	0.32
Answer» C. 0.24

Discussion

20.	An unsteady state system, the flow in the rate of A is 12 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 3 seconds?
A.	4 mole/s
B.	6 mole/s
C.	8 mole/s
D.	9 mole/s
Answer» C. 8 mole/s

Discussion

21.	Feed of a reactor has 0.75 mass fraction of O2 and some SO2, if the product rate is 1000 Kg/hr then what is the rate of SO2 in the feed?
A.	100 Kg/hr
B.	250 Kg/hr
C.	750 Kg/hr
D.	1000 Kg/hr
Answer» C. 750 Kg/hr

Discussion

22.	Feed of a reactor has 0.25 mass fraction of H2O and 0.75 mass fraction of CO2 with rate 4 g/hr, if the product rate is 20 g/hr what is the mass of CO2 in the product side?
A.	3 grams
B.	9 grams
C.	15 grams
D.	21 grams
Answer» D. 21 grams

Discussion

23.	What amount of 57 octane should be mixed with 3 liters of 63 octane to obtain 4 liters of 59 octane?
A.	1 liter
B.	2 liters
C.	2.5 liters
D.	4.5 liters
Answer» E.

Discussion

24.	The general material balance equation for reactive system is Accumulation = Input + Generation - x, what is x?
A.	Consumption - Output
B.	Consumption + Output
C.	Output - Consumption
D.	None of the mentioned
Answer» C. Output - Consumption

Discussion

25.	In a steady-state reactive system, 5 molar CH4 and 5 molar O2 are supplied to the system, then what is the amount of CO2 produced?
A.	2.5 molar
B.	5 molar
C.	7.5 molar
D.	10 molar
Answer» C. 7.5 molar

Discussion

26.	In a steady-state reactive system, 5 molar KNO3 and 5 molar H2SO4 are supplied to the system, then what is the amount of K2SO4 produced?
A.	2.5 molar
B.	5 molar
C.	7.5 molar
D.	10 molar
Answer» B. 5 molar

Discussion

27.	In a system if, Accumulation = Input - Output, where both the terms are distinct and non-zero, then the system is which of the following?
A.	Steady-state
B.	Closed
C.	Non-reactive
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

28.	In a system if, Accumulation = Generation - Consumption, where both the terms are distinct and non-zero, then the system is which of the following?
A.	Steady-state
B.	Closed
C.	Non-reactive
D.	None of the mentioned
Answer» C. Non-reactive

Discussion

29.	In a system if, Accumulation = Input - Output + Generation - Consumption, where all the four terms are distinct and non-zero, then the system is which of the following?
A.	Steady-state
B.	Closed
C.	Non-reactive
D.	None of the mentioned
Answer» E.

Discussion

30.	In a steady-state reactive system, NaCl and H2CO3 are supplied to the system at the rate of 200 L/min and 100 L/min respectively, what is the rate at which Na2CO3 is produced?
A.	100 L/min
B.	200 L/min
C.	300 L/min
D.	400 L/min
Answer» D. 400 L/min

Discussion

31.	In a steady-state reactive system, 2 molar NaCl and 1 molar H2CO3 are supplied to the system both at the rate of 100 mole/min, then how much Na2CO3 produced?
A.	1 molar
B.	2 molar
C.	3 molar
D.	4 molar
Answer» B. 2 molar

Discussion

32.	The rate of flow in stream with 40% O2 and 60% CO2 is 10 mole/hr, the contained was initially filled with 6 mole of O2, what will be the percentage of O2 in product stream?
A.	12.5
B.	25
C.	50
D.	62.5
Answer» E.

Discussion

33.	A reactor with efficiency 50%, has the feed CO2 and SO2 with mass fraction 0.4 and 0.6 with the rate 10 Kg/hr, what is the rate of CO2 in product side?
A.	0.5 Kg/hr
B.	1 Kg/hr
C.	1.5 Kg/hr
D.	2 Kg/hr
Answer» E.

Discussion

34.	Water flowing with TSS at the rate of 40 Liter/min, is discharged into a river flowing at the rate of 20 Liter/min, if the concentration of TSS in the river is 5 mg/L, what is the concentration of TSS in water?
A.	5 mg/L
B.	10 mg/L
C.	15 mg/L
D.	20 mg/L
Answer» C. 15 mg/L

Discussion

35.	The rate of flow in stream with 20% CH4 and 80% H2O is 5 mole/hr, the contained was initially filled with 3 mole of H2O, what will be the percentage of CH4 in product stream?
A.	5
B.	12.5
C.	25
D.	37.5
Answer» C. 25

Discussion

36.	The rate of flow in stream with 20% O2 and 80% CO2 is 5 mole/hr, the contained was initially filled with 3 mole of O2, what will be the percentage of O2 in product stream?
A.	12.5
B.	25
C.	37.5
D.	50
Answer» E.

Discussion

37.	The rate of flow in stream with 50% O2 and 50% CO2 is 10 mole/hr, the contained was initially filled with 10 mole of O2, what will be the percentage of O2 in product stream?
A.	25
B.	50
C.	75
D.	100
Answer» D. 100

Discussion

38.	The rate of flow in stream with 75% O2 and 25% CO2 is 20 mole/hr, the contained was initially filled with 5 mole of O2, what will be the percentage of O2 in product stream?
A.	20
B.	40
C.	60
D.	80
Answer» E.

Discussion

39.	50 Kg of a solid liquid mixture containing 20% solid and 80% water is left open in the atmosphere, after some time the water is 60%, how much water is evaporated?
A.	15 Kg
B.	25 Kg
C.	35 Kg
D.	45 Kg
Answer» C. 35 Kg

Discussion

40.	100 Kg of a gas mixture of 40% He and 60% Ne is passed through a diffusion tube and the product has 20% He and 80% Ne, what is the amount of He recovered?
A.	25 Kg
B.	45 Kg
C.	50 Kg
D.	75 Kg
Answer» B. 45 Kg

Discussion

41.	A gas mixture input is given to a membrane with 40% O2 and 60% N2, the waste contains 80% of the input and the product contains 25% O2 and 75% N2, what is the percentage of O2 in the waste?
A.	0.22
B.	0.44
C.	0.66
D.	0.88
Answer» C. 0.66

Discussion

42.	A gas mixture of 40% He and 60% Ne is passed through a diffusion tube and the product has 10% He and 90% Ne, what is the percentage of He recovered?
A.	0.25
B.	0.333
C.	0.5
D.	0.666
Answer» C. 0.5

Discussion

43.	100 Kg mol of a gas mixture input is given to a membrane with 30% O2 and 70% N2, the waste contains 60% of the input and the product contains 10% O2 and 90% N2, what are the number of moles of O2 in the waste?
A.	12
B.	16
C.	34
D.	42
Answer» D. 42

Discussion

44.	A semi-batch process differs from a closed process in which of the following?
A.	Input
B.	Output
C.	Generation
D.	Consumption
Answer» B. Output

Discussion

45.	A batch process is that in which material enters the system and _____ which of the following should fill the gap?
A.	Leaves
B.	Does not leaves
C.	Half of it leaves
D.	None of the mentioned
Answer» B. Does not leaves

Discussion

46.	The flow in rate of CH4 and O2 in a system are 2 mole/hr each what is the flow out rate of CO2?
A.	1 mole/hr
B.	2 mole/hr
C.	3 mole/hr
D.	4 mole/hr
Answer» B. 2 mole/hr

Discussion

47.	The flow in rate of HCl and NaOH in a system are 1 mole/hr each what is the flow out rate of NaCl?
A.	1 mole/hr
B.	2 mole/hr
C.	3 mole/hr
D.	4 mole/hr
Answer» B. 2 mole/hr

Discussion

48.	The flow in rate of H2SO4 and NaCl in a system are 2 mole/hr each what is the flow out rate of HCl?
A.	1 mole/hr
B.	2 mole/hr
C.	3 mole/hr
D.	4 mole/hr
Answer» C. 3 mole/hr

Discussion

49.	The flow in rate of C3H8 and O2 in a system are 2 mole/hr each what is the flow out rate of CO2?
A.	1 mole/hr
B.	1.2 mole/hr
C.	1.5 mole/hr
D.	2 mole/hr
Answer» C. 1.5 mole/hr

Discussion

50.	The flow in rate of C6H6 and H2 in a system are 3 mole/hr each what is the flow out rate of C6H12?
A.	1 mole/hr
B.	1.2 mole/hr
C.	1.5 mole/hr
D.	2 mole/hr
Answer» B. 1.2 mole/hr

Discussion

Explore topic-wise MCQs in Chemical Engineering.

CH4 at the rate 10 mole/min is reacted with O2 at the rate 10 mole/min, what is the rate of formation of CO2 in the product?

An aqueous solution with sulfur 10 g/L at the rate is 100 L/min and an organic compound with no sulfur at the rate 50 L/min were put into an extraction machine and produced an aqueous solution with sulfur 1 g/L, what is the amount of sulfur in the organic compound after extraction?

CH4 at the rate 10 mole/min is reacted with O2 at the rate 30 mole/min, what is the rate of formation of CO2 in the product?

Solution-1 containing 20% w1 and w2 at the rate 10 Kg/min combines with Solution-2 containing 10% w1, 20% w2 and w3 at the rate 20 Kg/min, the product formed contains and 10% w1, 30% w2 and 20% w3, what is the percentage of w2 in solution-1?

There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of a substance in the system?

In a random reaction 2 mole of CH4 and 1 mole of C2H4 are reacted, and 1 mole of C3H8 and 1 mole of CxHy are produced, what is x*y?

10 moles of A were present in a system initially, and 10 moles of C are added to it, it follows the reaction 2A + C -> 5B, what is the number of moles of B produced?

There were 15 moles of a substance present initially in a system, 25 moles were added to it and a reaction occurred so that its moles are reduced by 50%, what are the final moles of a substance in the system?

400 g of CaSO4 is dissolved with 500 g of H2O, if 226 g of CaSO4.5H2O crystallizes out, then what is the percentage of CaSO4 in the remaining solution?

10 moles of O2 is added to 10 moles of H2, how many moles of H2O will it produce?

A combustion reaction has reactants 1 mole of CxHy and 2 moles of O2 and products 1 mole of CO2 and 2 mole of H2O, what is x + y?

A reaction has reactants 2 moles of NaOH and 1 mole of H2SO4, and products Na2SO4 and H2O, what are the total moles of products?

What is the accumulation in the system after 4 second if the out flow and in flow rates are 3 g/s and 8 g/s?

The flow in rate of A is 8 mole/s, it undergoes a reaction 3A -> B, what are the moles of B that comes out after 6 seconds?

The flow in rate of A is 5 mole/s, it undergoes a reaction A -> 2B, what are the moles of B that comes out after 5 seconds?

A reactor has two feed streams with the ratio of their rate as 1:9 and has O2 and O3 with the mass fraction of 0.6 and 0.4 in stream 1 and 0.2 and 0.8 in stream 2, what is the mass fraction of O2 in the product side?

An unsteady state system, the flow in rate of A is 10 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 2 seconds?

A reactor has feed of two streams, stream 1 has CO2 and H2O with mass fraction of 0.4 and 0.6 and rate 10 kg/hr, and stream 2 has CO2 and H2O with mass fraction 0.1 and 0.9 and rate 40 Kg/hr, what the mass fraction of CO2 in the product stream?

An unsteady state system, the flow in the rate of A is 12 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 3 seconds?

Feed of a reactor has 0.75 mass fraction of O2 and some SO2, if the product rate is 1000 Kg/hr then what is the rate of SO2 in the feed?

Feed of a reactor has 0.25 mass fraction of H2O and 0.75 mass fraction of CO2 with rate 4 g/hr, if the product rate is 20 g/hr what is the mass of CO2 in the product side?

What amount of 57 octane should be mixed with 3 liters of 63 octane to obtain 4 liters of 59 octane?

The general material balance equation for reactive system is Accumulation = Input + Generation - x, what is x?

In a steady-state reactive system, 5 molar CH4 and 5 molar O2 are supplied to the system, then what is the amount of CO2 produced?

In a steady-state reactive system, 5 molar KNO3 and 5 molar H2SO4 are supplied to the system, then what is the amount of K2SO4 produced?

In a system if, Accumulation = Input - Output, where both the terms are distinct and non-zero, then the system is which of the following?

In a system if, Accumulation = Generation - Consumption, where both the terms are distinct and non-zero, then the system is which of the following?

In a system if, Accumulation = Input - Output + Generation - Consumption, where all the four terms are distinct and non-zero, then the system is which of the following?

In a steady-state reactive system, NaCl and H2CO3 are supplied to the system at the rate of 200 L/min and 100 L/min respectively, what is the rate at which Na2CO3 is produced?

In a steady-state reactive system, 2 molar NaCl and 1 molar H2CO3 are supplied to the system both at the rate of 100 mole/min, then how much Na2CO3 produced?

The rate of flow in stream with 40% O2 and 60% CO2 is 10 mole/hr, the contained was initially filled with 6 mole of O2, what will be the percentage of O2 in product stream?

A reactor with efficiency 50%, has the feed CO2 and SO2 with mass fraction 0.4 and 0.6 with the rate 10 Kg/hr, what is the rate of CO2 in product side?

Water flowing with TSS at the rate of 40 Liter/min, is discharged into a river flowing at the rate of 20 Liter/min, if the concentration of TSS in the river is 5 mg/L, what is the concentration of TSS in water?

The rate of flow in stream with 20% CH4 and 80% H2O is 5 mole/hr, the contained was initially filled with 3 mole of H2O, what will be the percentage of CH4 in product stream?

The rate of flow in stream with 20% O2 and 80% CO2 is 5 mole/hr, the contained was initially filled with 3 mole of O2, what will be the percentage of O2 in product stream?

The rate of flow in stream with 50% O2 and 50% CO2 is 10 mole/hr, the contained was initially filled with 10 mole of O2, what will be the percentage of O2 in product stream?

The rate of flow in stream with 75% O2 and 25% CO2 is 20 mole/hr, the contained was initially filled with 5 mole of O2, what will be the percentage of O2 in product stream?

50 Kg of a solid liquid mixture containing 20% solid and 80% water is left open in the atmosphere, after some time the water is 60%, how much water is evaporated?

100 Kg of a gas mixture of 40% He and 60% Ne is passed through a diffusion tube and the product has 20% He and 80% Ne, what is the amount of He recovered?

A gas mixture input is given to a membrane with 40% O2 and 60% N2, the waste contains 80% of the input and the product contains 25% O2 and 75% N2, what is the percentage of O2 in the waste?

A gas mixture of 40% He and 60% Ne is passed through a diffusion tube and the product has 10% He and 90% Ne, what is the percentage of He recovered?

100 Kg mol of a gas mixture input is given to a membrane with 30% O2 and 70% N2, the waste contains 60% of the input and the product contains 10% O2 and 90% N2, what are the number of moles of O2 in the waste?

A semi-batch process differs from a closed process in which of the following?

A batch process is that in which material enters the system and _____ which of the following should fill the gap?

The flow in rate of CH4 and O2 in a system are 2 mole/hr each what is the flow out rate of CO2?

The flow in rate of HCl and NaOH in a system are 1 mole/hr each what is the flow out rate of NaCl?

The flow in rate of H2SO4 and NaCl in a system are 2 mole/hr each what is the flow out rate of HCl?

The flow in rate of C3H8 and O2 in a system are 2 mole/hr each what is the flow out rate of CO2?

The flow in rate of C6H6 and H2 in a system are 3 mole/hr each what is the flow out rate of C6H12?