Chemistry Class 9th
41. 1g of hydrogen is equal to
A. 1 mole of Hydrogen
B. 6.023 1023 atoms of Hydrogen
C. Both a and b
42. _______unit is used to measure the amount of substance
A. Gram
B. Avogadro’s number
C. Mole
43. Mole forms link between mass of substance and
A. Mole
B. Gram
C. NA
44. Mass of atom is expressed in
A. Gram
B. Atomic Mass Unit
C. mol
45. Atomic mass of carbon is
A. 11g
B. 12 amu
C. None of these
46. When reletavie atomic mass expressed in grams then it is called
A. amu
B. Atomic Mass
C. Gram Atomic Mass
47. When formula mass expressed in grams then it is called
A. Fromula mass
B. Gram formula
C. None
48. 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
49. No. of moles in 60g of CO2 is
A. 1 mole
B. 1.36 moles
C. 2 moles
50. Correct formula to calculate no. of particles is
A. n =mass /molar mass
B. No. of particles= n* NA
B. Both a and b
51. Which of the following is homogenous mixture
A. Milk
B. Air
C. Water
52. The gram molecular mass of HCl is
A. 3
B. 36.5
C. 30
53. 1mole of H2SO4 is equal to
A. 10g
B. 98g
C. 80g
54. 1st idea of division of matter is given by
A. Bohr
B. Rutherford
C. Democritus
55. Atom is derived from word Atomos
A. Italian
B. Greek
C. None of these
56. Atomos means
A. Divisible
B. Indivisible
C. Free
57. The word atom was used in
A. 200 B.C
B. 300 B.C
C. 400 B.C
58. Atom is an particle
A. Indivisible
B. Divisible
B. Both
59. Atoms of particular elements are
A. Identical
B. Not identical
C. Changed
60. Rutherford performed experiment in
A. 11
B. 114
C. 1911