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