# calculator for stoichiometry MCQs | stoichiometry MCQs class 11

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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 dm3, 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 NH3. 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 N2, 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