Mole Concept, Molar Mass NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Mole Concept, Molar Mass MCQ Questions


7.
Mass of one carbon-12 atom is 1.992648 × 10⁻²³ g. The number of atoms in 12 g of ¹²C is:
A.
6.022 × 10²²
B.
1.992 × 10²³
C.
6.022 × 10²³
D.
12 × 10²³
😑 View Answer Rough Work Error
ANSWER :
C. 6.022 × 10²³
8.
If we count 1 mole of grains of sand at a rate of 1 grain per second, how long would it take?
A.
About 1 minute
B.
About 1 hour
C.
About 1 year
D.
Many trillions of years
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ANSWER :
D. Many trillions of years
9.
The number of moles of a substance is calculated as:
A.
Mass / molar mass
B.
Mass × Avogadro's number
C.
Molar mass / mass
D.
Mass × molar mass
😑 View Answer Rough Work Error
ANSWER :
A. Mass / molar mass
10.
How many moles are present in 9 g of water? (Molar mass H₂O = 18 g/mol)
A.
1.0 mol
B.
0.5 mol
C.
0.25 mol
D.
2.0 mol
😑 View Answer Rough Work Error
ANSWER :
B. 0.5 mol
11.
How many moles are in 11 g of CO₂? (Molar mass CO₂ = 44 g/mol)
A.
1.0 mol
B.
0.125 mol
C.
0.5 mol
D.
0.25 mol
😑 View Answer Rough Work Error
ANSWER :
D. 0.25 mol
12.
The mass of 0.5 mol of NaOH is: (NaOH = 40 g/mol)
A.
10 g
B.
20 g
C.
40 g
D.
80 g
😑 View Answer Rough Work Error
ANSWER :
B. 20 g