11th class (FSc) chemistry Unit 1 MCQs
51. The volume occupied by 1.4g of N2 at S.T.P is:
a. 1.12 dm3
b. 2.24 dm3
c. 112 cm3
d. 22.4 dm3
52. The volume occupied by 16g of CH4 at S.T.P is:
a. 1.12 dm3
b. 224.14 dm3
c. 2.24 dm3
d. 22.4 dm3
53. Mass of 22.4 dm3 of N2 at STP is:
a. 1.4gm
b. 28gm
c. 2.8gm
d. 14gm
54. A limiting reactant is one which:.
a. Gives maximum amount of product
b. Is taken in lesser quantity in grams as compared to other reactants
c. Gives minimum amount of product
d. Is taken in lesser quantity in volume as compared to other reactants
55. 27g of Al will react completely with how much mass of O2 to produce Al2O3
a. 32g of oxygen
b. 8g of oxygen
c. 24g of oxygen
d. 16g of oxygen
56. In mass spectrometer, detector or collector measure yhe:
a. Percentage of isotopes
b. Masses of isotopes
c. Mass number of isotopes
d. Relative abundance of isotopes
57. How many Cl (Chlorine) atoms are in two moles of chlorine?
a. 35.5x 6.02 x1023 atoms
b. 2 x 6.2 x 10-23 atoms
c. 2 x 6.2 x1023 atoms
d. 2 x 1023 atoms
58. An organic compound has empirical formula C3H3O, if molar mass of compound is 110.15 gmol-1 The molecular:
a. C9H9O3
b. C6H6O2
c. C6H6O3
d. C3H3O
59. An organic compound has empirical formula C3H3O, if molar mass ofcompound is 110.15 gmol-1 The molecular formula of this organiccompound is (A, of C=12, H=1.008 and 0=16)
a. Two
b. Five
c. Three
d. Four
60. Hydrogen bums in chlorine to produce hydrogen chloride. The ratio of masses of reactants.
a. 1:71
b. 1:35.5
c. 2:70
d. 2:35.5
61. What is the relative atomic mass (A.value) of Neon.
a. 20:28
b. 20:18
c. 20:22
d. 20:10
62. A polymer of empirical formula CH2 has molar mass of 28000g mo-1l .Its molecular formula will be:
a. 200 time that of its empirical formula
b. 100 times that of its empirical formula
c. 2000 time that of its empirical formula
d. 500 time that of its empirical formula
63. The number of molecule in 9 g of ice (H2O) is:
a. 6.02 x 1023
b. 6.02 x 1024
c. 3.01 x 1023
d. 3.01 x 1024
64. How many moles of sodium are present in 0.1 g of sodium?
a. 4.03 x 10-1
b. 4.3 x 103
c. 4.3 x 10-2
d. 4.01 x 102
65. With the help of spectral data given calculate the mass of Neon and encircle the best option.
a. 21.18 amu
b. 22.18 amu
c. 22.20 amu
d. 20.18 amu
66. The substance for the separation os isotopes in firstly converted intothe:
a. Free state
b. Neutral state
c. Charge state
d. Vapour state
67. The number of moles of CO2 which contain 8.00 gm of oxygen is:
a. 1.50
b. 0.75
c. 1.00
d. 0.25
68. Melting point of water is higher than petrol, because intermolecular forces in water are:
a. Stronger than petrol
b. Weaker then petrol
c. Negligible
d. Same as in petrol
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