1.
Theoretical yield is:
A
Actual amount obtained
B
Maximum possible amount
C
Minimum possible amount
D
Average yield
2.
If percentage yield is 100%, it means:
A
No reaction occurred
B
Actual yield is zero
C
Actual yield equals theoretical yield
D
Loss of product occurred
3.
The amount of substance is directly proportional to:
A
Volume
B
Mass
C
Number of particles
D
Density
4.
During dilution, the number of moles of solute:
A
Increases
B
Decreases
C
Remains constant
D
Becomes zero
5.
What is the SI unit for amount of substance?
A
Gram
B
Mole
C
Liter
D
Kilogram
6.
Which yield is always less than or equal to theoretical yield?
A
Actual yield
B
Percentage yield
C
Limiting yield
D
Maximum yield
7.
In the equation 2H₂ + O₂ → 2H₂O, the mole ratio of H₂ to O₂ is:
8.
Mole ratio is obtained from which part of a chemical equation?
A
Products only
B
Reactants only
C
Balanced coefficients
D
Chemical symbols
9.
Which term refers to the calculated amount of product?
A
Actual yield
B
Percentage yield
C
Theoretical yield
D
Limiting yield
10.
Avogadro’s number is:
A
6.02 × 10^20
B
6.02 × 10^21
C
6.02 × 10^22
D
6.02 × 10^23
11.
Mole is a unit related to:
A
Mass
B
Volume
C
Number of particles
D
Density
12.
Which reactant remains unconsumed after reaction completion?
A
Limiting reactant
B
Catalyst
C
Non-limiting reactant
D
Product
13.
The limiting reactant is identified by comparing:
A
Masses only
B
Volumes only
C
Moles with mole ratio
D
Concentrations only
14.
If actual yield is less than theoretical yield, percentage yield will be:
A
More than 100%
B
Equal to 100%
C
Less than 100%
D
Zero
15.
Which quantity remains unchanged during dilution?
A
Volume
B
Molarity
C
Moles of solute
D
Strength
16.
Which formula is used for dilution?
A
M = m/V
B
M₁V₁ = M₂V₂
C
n = m/M
D
PV = nRT
17.
Percentage yield is calculated using which formula?
A
(Actual/Theoretical) × 100
B
(Theoretical/Actual) × 100
C
Actual + Theoretical
D
Actual − Theoretical
18.
Which yield is used to measure efficiency of a reaction?
A
Actual yield
B
Theoretical yield
C
Percentage yield
D
Limiting yield
19.
Which factor does NOT affect percentage yield?
A
Side reactions
B
Purity of reactants
C
Balanced equation
D
Experimental loss
20.
The mole ratio is valid only for:
A
Unbalanced equations
B
Balanced equations
C
Word equations
D
Ionic equations