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1. The number of atoms in 1 gram of light element is ……. than the number of atoms in one gram of
   heavy elements
   a. Less b. More c. Equal d. NOT
2. 3.2 grams of wood alcohol (CH3 OH) contains the total number of atoms
   a. 6.02×10²³ b. 3.01×10²³ c. 3.612×10²³ d. 3.612×10²³
3. The mole ratio of C, H, and O is 5, and 1.6 respectively the E.F of the compound is
   a. C₃H₈O₁ b. C₄H₆O₁ c. C₃H₁₃O₂ d. NOT
4. The formula that not only shows relative ratio but also the actual ratio of atoms of different
   elements is called
   a. Empirical formula b. Molecular formula c. Formula unit d. NOT
5. In the determination of E.F., the 1st three steps are pertaining to
   a. Mole ratio b. Simplest ratio c. % composition d. AOT
6. The mass of hydrogen in 0.684 Kg of sugar is
   a. 0.044 kg b. 0.022 kg c. 0.356 kg d. 0.5 kg
7. Which of the following is the false statement
   a. Volume of 3.01×10²⁴ molecules of He at STP = 112 dm³
   b. 6.00 dm³ of N₂ has mass = 7.0 grams
   c. 22400 cm3 gas at STP has the same molecules as 1 mole of gas
   d. one mole of substance contains 6.0002 x 10^-23 particles
8. A hydrocarbon contains 40% hydrogen. The mole ratio of carbon is
   a. 4 b. 5 c. 6 d. 3.33
9. How many molecules of oxygen are required to burn 4g marsh gas (CH4) completely?
   a. 3.01 x 10²² b. 1.505 x 10²⁴ c. 6.02 x 10²³ d. 3.01 x 10²³
10. 2.7g of Aluminum will react completely with how many grams of O to produce
    Al2O3
    a. 8.0g b. 1.6g c. 2.4g d. 3.2g
11. One mole of NO₂ has the same mass as one mole of
    a. C₂H₅OH b. CO₂ c. CH₃OH d. NaOH
12. The volume occupied by 16g of Sulphur dioxide at 273 degrees and 1520 torr pressure is
    a. 5.6dm³ b. 11.2dm³
    c. 22.4dm³ d. 1.6dm³
13. The mass of 3.01 x 10²⁴ molecules of CH₄ is
    a. 160G b. 80g c. 40g d. 20g
14. At STP in a reaction 900 dm^3, each of the N₂ and H₂ gases are allowed to react as
    N2+3H2— 2NH3 the volume of NH3 formed as
    a. 300 dm³ b. 400 dm³ c. 600 dm³ d. 900 dm³
15. A compound contains 20%. A and 80% B. if atomic mass A = 10 B = 20 then E.F is
    A. AB B. AB2 C. A2B D. A2B3
16. 55 grams of CO₂ at STP occupies
    a. 44.8 dm³ b. 55 dm³
    c. 28 dm³ d. 22.4 dm³
17. which one of the following pairs of compounds contains the same mass of sodium.
    a. NaCl and NaOH b. Na₂SO₄ and Na₂CO₃ c. Na₃PO₄ and Na₃N d. AOT
18. The number of moles in 5.1 grams of NH3 is
    a. 0.2 b. 0.3 c. 3 d. 1.3
19. 0.3 moles of carbon contains …… the number of carbons atoms.
    a. 1.806 x 10²³ b. 18.66 x 10²³ c. 180.6 x 10²⁰ d. 1.806 x 10²⁴
20. The empirical formula of acetylene is
    a. C₂H₂ b. CH c. CH₂ d. CH₄
21. The symbol of Antimony is
    a. An b. At c. Sn d. Sb
22. which of the following is an example of chemical change of except?
    a. Digestion of food b. Burning of wood c. Death of living body d. Boiling of water
23. 1200 ml each of N₂ and H₂ are reacted at STP to form NH_3. The resulting mixture contains
    a. 1200 ml N₂, 1200 ml H₂, O ml NH₃ b. 600 ml N₂, 600 ml H₂, 1200 ml NH₃
    c. 600 ml N_2, 0 ml H₂, 1800 ml NH₃ d. 800 ml N₂, 0 ml H₂, 800 ml NH₃
24. Which of the following contains the same number of molecules
    a. 16 g OH₂ and 16.00 g NH₃ b. 4.6 g C₂H₅OH and 4.6 g NO₂
    c. 3.2 g O₂ and 3.2 g CH₄ d. NOT
25. 3.01 x 10²⁰ molecules of each SO₂ and O₂ are taken to form SO₂ as 2SO₂ + O₂ —> 2 SO₃. The limiting
    reactant is
    a. SO₂ b. O₂ c. SO₃ d. NOT