Chemistry Class 9th
141- Mole is represented by
A) M
B) N
C) mol
142- Mole forms link between mass of substance and
A. Mole
B) Gram
C) NA
143- Mass of atom is expressed in
A. Gram
B) Atomic mass unit
C) mol
144- Atomic mass of carbon is
A. 11g
B) 12 amu
C) None of these
145- 1 mole of water is equal to
A. 18 g
B) 16g
C) 20g
146- When reletavie atomic mass expressed in grams then it is called
A. amu
B) atomic mass
C) gram atomic mass
147- 1g atom of hydrogen is equal to
A. 1.008 g hydrogen
B) 1 mol of hydrogen
C) both a and b
148- When molecular mass expressed in grams then it is called
A. Atomic mass
B) Gram molecule
C) Gram atom
149-When formula mass expressed in grams then it is called
A) Fromula mass
B) Gram formula
C) None
150-What is correct formula for calculating no. of moles
A) n= given mass in grams / molar mass
B) n= given mass × molar mass
C) none of these
151- No. of moles in 60g of CO2 is?
A) Wrong
B) Good
C) Correct
D) Both A & C
152-Correct formula to calculate no. of particles is
A) n= mass/ molar mass
B) No. of particles = n × NA
C) Both a and b
153-Which of the following is homogenous mixture
A) Milk
B) Air
C) Water
154-The gram molecular mass of HCl is
A) 35
B) 36.5
C) 30
155-1mole of H2SO4 is equal to
A) 89g
B) 98g
C) 80g
156- 1st idea of division of matter is given by
A) Boher
B) Rutherfoard
C) Democritus
157-Atom is derived from --------- word Atomos
A) Italian
B) Greek
C) None of these
158- Atomos means
A) Divisible
B) Indivisible
C) Free
159- The word atom was used in
A) 200 B.C.
B) 300 B.C.
C) 400B.C
160- Atom is an -------- particle
A) Indivisible
B) Divisible
C) Both