AFNS — AFNS Chemistry
Basic Concepts
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#9 Mole is defined as amount containing Avogadro number of:
A) Ions
B) Particles
C) Atoms only
D) Molecules only
Answer: B
#10 Avogadro number is approximately:
A) 6.02 x 10^23
B) 3 x 10^8
C) 9.8
D) 1.6 x 10^-19
Answer: A
#11 Atomic mass unit (amu) is 1/12 mass of:
A) C-12 atom
B) H atom
C) O atom
D) N atom
Answer: A
#12 Empirical formula shows:
A) Simplest ratio of atoms
B) Actual molecules
C) Only ions
D) Only gases
Answer: A
#13 Molecular formula shows:
A) Actual number of atoms
B) Simplest ratio only
C) Only mass
D) Only volume
Answer: A
#14 Molar mass of H2O is about:
A) 18 g/mol
B) 32 g/mol
C) 44 g/mol
D) 2 g/mol
Answer: A
#15 Law of conservation of mass was given by:
A) Lavoisier
B) Dalton
C) Bohr
D) Rutherford
Answer: A
#16 Law of definite proportions states:
A) Fixed composition in compound
B) Random composition
C) No compounds exist
D) Only mixtures
Answer: A
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