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# Multiple choice question for engineering

## Set 1

1-4. For the given reaction, extent of the reaction is 2 moles reacting.
H2S2O7 + H2O → 2H2SO4
1. How much kg of H2S2O7 is required as per reaction extent?
a) 712
b) 356
c) 178
d) 89

Answer: b [Reason:] Kg of H2S2O7 is= 2*178 = 356.

2. How much kg of H2O is required as per reaction extent?
a) 18
b) 36
c) 54
d) 72

Answer: b [Reason:] Kg of H2O required= 2*18 = 36.

3. How many moles of the product are collected?
a) 2
b) 4
c) 6
d) 8

Answer: b [Reason:] Moles of the product = 2*2 = 4.

4. If the kg amount of both the reactants is doubled. What is the extent of the reaction?
a) 2
b) 4
c) 6
d) 8

Answer: a [Reason:] If we double the kg amount of reactant, we double the moles. The extent becomes double.

5. What is extent of reaction the reaction, if 40 moles CO2 is produced?
2CO + O2 → 2CO2
a) 5
b) 10
c) 20
d) 40

Answer: c [Reason:] Extent of the reaction = (40– 0)/2 = 20.

6-8. N2 + 2O2 → 2NO2
6. What is the extent of reaction if 5 moles of N2 is required for the reaction?
a) 5
b) 10
c) 15
d) 20

Answer: a [Reason:] Extent of reaction = (5 – 0)/1 = 5.

7. What is the extent of reaction if 10 moles of O2 is required for the reaction?
a) 5
b) 10
c) 15
d) 20

Answer: a [Reason:] Extent of reaction = (10 – 0)/2 = 5.

8. What is the extent of reaction if 10 moles of NO2 are produced inthe reaction?
a) 5
b) 10
c) 15
d) 20

Answer: a [Reason:] Extent of reaction = (10 – 0)/2 = 5.

9-10. H2O2 + H2 → 2H2O
For the given reaction, if the extent of reaction is 20.
9. How much water is produced in the reaction?
a) 10 moles
b) 20 moles
c) 30 moles
d) 40 moles

Answer: d [Reason:] 20 = (x – 0)/2, x = 40 moles.

10. How much H2O2 is required as per extent?
a) 10 moles
b) 20 moles
c) 30 moles
d) 40 moles

Answer: b [Reason:] Required moles of H2O2 = extent of the reaction.

## Set 2

1-4. For the given reaction, extent of the reaction is 2 moles reacting.
H2S2O7 + H2O → 2H2SO4
1. How much kg of H2S2O7 is required as per reaction extent?
a) 712
b) 356
c) 178
d) 89

Answer: b [Reason:] Kg of H2S2O7 is= 2*178 = 356.

2. How much kg of H2O is required as per reaction extent?
a) 18
b) 36
c) 54
d) 72

Answer: b [Reason:] Kg of H2O required= 2*18 = 36.

3. How many moles of the product are collected?
a) 2
b) 4
c) 6
d) 8

Answer: b [Reason:] Moles of the product = 2*2 = 4.

4. If the kg amount of both the reactants is doubled. What is the extent of the reaction?
a) 2
b) 4
c) 6
d) 8

Answer: a [Reason:] If we double the kg amount of reactant, we double the moles. The extent becomes double.

5. What is extent of reaction the reaction, if 40 moles CO2 is produced?
2CO + O2 → 2CO2
a) 5
b) 10
c) 20
d) 40

Answer: c [Reason:] Extent of the reaction = (40– 0)/2 = 20.

6-8. N2 + 2O2 → 2NO2
6. What is the extent of reaction if 5 moles of N2 is required for the reaction?
a) 5
b) 10
c) 15
d) 20

Answer: a [Reason:] Extent of reaction = (5 – 0)/1 = 5.

7. What is the extent of reaction if 10 moles of O2 is required for the reaction?
a) 5
b) 10
c) 15
d) 20

Answer: a [Reason:] Extent of reaction = (10 – 0)/2 = 5.

8. What is the extent of reaction if 10 moles of NO2 are produced inthe reaction?
a) 5
b) 10
c) 15
d) 20

Answer: a [Reason:] Extent of reaction = (10 – 0)/2 = 5.

9-10. H2O2 + H2 → 2H2O
For the given reaction, if the extent of reaction is 20.
9. How much water is produced in the reaction?
a) 10 moles
b) 20 moles
c) 30 moles
d) 40 moles

Answer: d [Reason:] 20 = (x – 0)/2, x = 40 moles.

10. How much H2O2 is required as per extent?
a) 10 moles
b) 20 moles
c) 30 moles
d) 40 moles

Answer: b [Reason:] Required moles of H2O2 = extent of the reaction.

## Set 3

1. _______________ is the fraction of the limiting reactant in the feed that is converted into products.
a) Conversion
b) Production
c) Extent of reaction
d) None of the mentioned

Answer: a [Reason:] Conversion is the fraction of the limiting reactant in the feed that is converted into products.

2. Two statements are given as follows
I: Conversion is related to degree of completion.
II: Fraction conversion is dimensionless.
a) Both statements are correct
b) Both statements are incorrect
c) Only one statement is correct
d) None of the mentioned

Answer: a [Reason:] Both I & II are the properties of Conversion.

3. The ratio of extent of reaction that actually occurs and extent of reaction that would occur if complete reaction took place is called
a) Conversion
b) Production
c) Extent of reaction
d) None of the mentioned

Answer: a [Reason:] The ratio of extent of reaction that actually occurs and extent of reaction that would occur if complete reaction took place is called Conversion.

4. 1 mole of C5H12 is brunt in access air and 200 gms of CO2 is recovered in the process.
What is the percent conversion?
a) 90.9
b) 80.9
c) 70.9
d) 60.9

Answer: a [Reason:] 1 mole of C5H12 = 5 moles of CO2 Percentage conversion = (moles of the limiting reactant in the feed that reacts) / (moles of the limiting reactant introduced in the feed.

5. The theoretical yield and actual yield in a reaction are not equal. It might be because of
a) Impurities among reactants
b) Side reactions
c) Reversible reaction
d) All of the mentioned

Answer: d [Reason:] The reason behind it includes a, b & c all.

6-10. For the given water gas reaction,
CO + H2O → CO2 + H2
The feed consists of 18 moles of CO and 20 moles of steam. In the product, both CO2 and H2 are 15 moles.
6. Which is the limiting reactant in water gas reaction?
a) CO
b) H2O
c) CO2
d) None of the mentioned

Answer: a [Reason:] 1 mole of CO2 = 1 moles of H2O.

7. Which is the excess reactant in water gas reaction?
a) CO
b) H2O
c) CO2
d) None of the mentioned

Answer: b [Reason:] 1 mole of CO2 = 1 moles of H2O.

8. What is the percentage conversion of the reactant?
a) 83.33
b) 73.33
c) 63.33
d) 53.33

Answer: a [Reason:] percentage conversion = (moles of the limiting reactant in the feed that reacts) / (moles of the limiting reactant introduced in the feed).

9. Kilograms of CO2 yielded per kg of CO?
a) 1.57
b) 2.34
c) 3.28
d) 4.12

Answer: a [Reason:] 28 kgs of CO = 44 kgs of CO2.

10. Kilograms of H2 yielded per kilogram of steam feed?
a) 2.33
b) 4.33
c) 6.33
d) 8.33

Answer: d [Reason:] 20×18 kgs of H2O = 15×2 kgs of H2.

## Set 4

1. _______________ is the fraction of the limiting reactant in the feed that is converted into products.
a) Conversion
b) Production
c) Extent of reaction
d) None of the mentioned

Answer: a [Reason:] Conversion is the fraction of the limiting reactant in the feed that is converted into products.

2. Two statements are given as follows
I: Conversion is related to degree of completion.
II: Fraction conversion is dimensionless.
a) Both statements are correct
b) Both statements are incorrect
c) Only one statement is correct
d) None of the mentioned

Answer: a [Reason:] Both I & II are the properties of Conversion.

3. The ratio of extent of reaction that actually occurs and extent of reaction that would occur if complete reaction took place is called
a) Conversion
b) Production
c) Extent of reaction
d) None of the mentioned

Answer: a [Reason:] The ratio of extent of reaction that actually occurs and extent of reaction that would occur if complete reaction took place is called Conversion.

4. 1 mole of C5H12 is brunt in access air and 200 gms of CO2 is recovered in the process.
What is the percent conversion?
a) 90.9
b) 80.9
c) 70.9
d) 60.9

Answer: a [Reason:] 1 mole of C5H12 = 5 moles of CO2 Percentage conversion = (moles of the limiting reactant in the feed that reacts) / (moles of the limiting reactant introduced in the feed.

5. The theoretical yield and actual yield in a reaction are not equal. It might be because of
a) Impurities among reactants
b) Side reactions
c) Reversible reaction
d) All of the mentioned

Answer: d [Reason:] The reason behind it includes a, b & c all.

6-10. For the given water gas reaction,
CO + H2O → CO2 + H2
The feed consists of 18 moles of CO and 20 moles of steam. In the product, both CO2 and H2 are 15 moles.
6. Which is the limiting reactant in water gas reaction?
a) CO
b) H2O
c) CO2
d) None of the mentioned

Answer: a [Reason:] 1 mole of CO2 = 1 moles of H2O.

7. Which is the excess reactant in water gas reaction?
a) CO
b) H2O
c) CO2
d) None of the mentioned

Answer: b [Reason:] 1 mole of CO2 = 1 moles of H2O.

8. What is the percentage conversion of the reactant?
a) 83.33
b) 73.33
c) 63.33
d) 53.33

Answer: a [Reason:] percentage conversion = (moles of the limiting reactant in the feed that reacts) / (moles of the limiting reactant introduced in the feed).

9. Kilograms of CO2 yielded per kg of CO?
a) 1.57
b) 2.34
c) 3.28
d) 4.12

Answer: a [Reason:] 28 kgs of CO = 44 kgs of CO2.

10. Kilograms of H2 yielded per kilogram of steam feed?
a) 2.33
b) 4.33
c) 6.33
d) 8.33

Answer: d [Reason:] 20×18 kgs of H2O = 15×2 kgs of H2.

## Set 5

1. The ratio of the moles of a particular product produced to the moles of another product produced in a reaction is called
a) Percentage conversion
b) Selectivity
c) Extent of reaction
d) None of the mentioned

Answer: b [Reason:] The ratio of the moles of a particular product produced to the moles of another product produced in a reaction is called Extent of reaction.

2. Which is the incorrect definition for yield?
a) The amount of desired product obtained divided by the amount of key reactant feed
b) The amount of desired product obtained divided by the amount of key reactant consumed
c) The amount of a product obtained divided by the theoretical amount of the product that would be obtained based on the limiting reactant in the chemical reaction equation if it were completely consumed
d) None of the mentioned

Answer: d [Reason:] Different set of definitions are there in every case.

3-10. Two reaction of interest are as following
Cl2 + C4H8 → C4H7Cl + HCl
Cl2 + C4H8 → C4H8Cl2
When the reaction is finished, the quantity of each species is listed below
Cl2 : 160 g moles
C4H8 : 400 g moles
C4H7Cl : 10 g moles
C4H8Cl2 : 40 gm moles
HCl : 10 gm moles

3. How many moles of Cl2 are there in the feed?
a) 160
b) 170
c) 210
d) 230

Answer: c [Reason:] Moles of Cl2 = 160 + 40 (Reacting in second reaction) + 10 (Reacting in first reaction).

4. How many moles of C4H8 are there in the feed?
a) 400
b) 410
c) 440
d) 450

Answer: d [Reason:] Moles of C4H8 = 400 + 40 (Reacting in second reaction) + 10 (Reacting in first reaction).

5. Which one is the limiting reactant?
a) Cl2
b) C4H8
c) C4H7Cl
d) None of the mentioned

Answer: a [Reason:] Cl2 has lower extent of reaction.

6. Which one is the excess reactant?
a) Cl2
b) C4H8
c) C4H7Cl
d) None of the mentioned

Answer: b [Reason:] C4H8 has higher extent of reaction.

7. What is the fractional conversion of C4H8 to C4H7Cl?
a) 0.022
b) 0.044
c) 0.066
d) 0.088

Answer: a [Reason:] Fractional conversion = 10/450.

8. What is the selectivity of C4H7Cl relative to C4H8Cl2?
a) 0.25
b) 0.50
c) 0.75
d) 1.00

Answer: a [Reason:] Selectivity = 10 (gm moles of C4H7Cl)/40 (gm moles of C4H8Cl2).

9. What is the extent of first reaction?
a) 10
b) 20
c) 30
d) 40