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- 1. Multiple Choice
1.A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:
a) Law of Conservation of Mass
b) Las of Multiple Proportions
c) Law of Definite Proportions
d) Avogadro’s Law
- 2. Multiple Choice
2.An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:
(a) XY
(b) XY2
(b) XY2
(d) XY4
- 3. Multiple Choice
3.The molecular formula of potassium nitrate is ________.
(a) KNO3
(b) KNO
(c) KNO2
(d) KON
- 4. Multiple Choice
4.Molecular mass is defined as the:
(a) Mass of one molecule of any substance compared with the mass of one atom of C – 12
(b) Mass of one atom compared with the mass of one atom of hydrogen
(c) Mass of one atom compared with the mass of one molecule
(d) None of the above
- 5. Multiple Choice
5.Which of the following represents a correct chemical formula of Sodium chloride
(a) CaCl
(b) BiPO4
c) NaSO4
d) NaCl
- 6. Multiple Choice
6.The relative molecular mass of Na2S2O3.5H2O is
(a) 250 amu
(b) 250 g
c) 248 amu
(d) 248 g
- 7. Multiple Choice
7.The chemical symbol for sodium is
a) So
b) Sd
c) NA
d) Na
- 8. Multiple Choice
8.The atomicity of K2Cr2O7 is
a)9
b) 11
c)10
d)10
- 9. Multiple Choice
9.The chemical symbol for nitrogen gas is
(a) Ni
b) N2
c) N+
(d) N
- 10. Multiple Choice
10.The value of Avogadro’s constant is:
(a) 6.0 × 1024
(b) 6.01 × 1022
c) 6.022 × 1023
d) 6.022 × 10-23
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