Class 11 Chemistry · Chapter 4 · Test 1
Stoichiometry Chapter 4
This 25-question MCQ test covers Chapter 4
35 questions · 20 min · 35 marks
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Sample questions
The first 5 of 35. Try each one, then tap to see the answer.
Question 1
Which one of the following statements is incorrect?
- AOne mole of nitrogen gas contains Avogadro's number of molecules
- BOne mole of ozone gas contains Avogadro's number of molecules
- COne mole of ozone contains Avogadro's number of O atoms
- DOne mole of hydrogen gas contains Avogadro's number of molecules
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Answer: C
Ozone is O3 so one mole has Avogadro's number of molecules but 3 times that number of O atoms.
Question 2
Which one of the following has greatest mass?
- A0.5 mol of N2
- B0.5 mol of NH3
- C0.5 mol of He
- D0.5 mol of CO2
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Answer: D
Mass = n x M. For 0.5 mol: N2 = 14 g and NH3 = 8.5 g and He = 2 g and CO2 = 22 g.
Question 3
Which one of the following gases will have greatest volume at STP?
- A22 g of CO2
- B88 g of N2O
- C28 g of CO
- D28 g of N2
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Answer: B
88 g of N2O (44 g/mol) = 2 mol, which is more than 0.5 mol of CO2 and 1 mol each of CO and N2. At STP volume is proportional to moles.
Question 4
Which of the following contains same number of particles as present in 12 g of carbon?
- A28 g of iron (Atomic mass of Fe = 56)
- B48 g of magnesium (Atomic mass of Mg = 24)
- C32 g of S8 molecules (Atomic mass S = 32)
- D40 g of carbon dioxide (molar mass of CO2 = 44)
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Answer: C
12 g of carbon is 1 mole. 32 g of sulphur with atomic mass 32 is 1 mole of atoms. Iron is 0.5 mol and magnesium is 2 mol and CO2 is about 0.91 mol.
Question 5
Volume at S.T.P. of 22 g of CO2 is same as that of:
- A2 g of hydrogen
- B8.5 g of NH3
- C64 g of gaseous SO2
- D7 g of CO
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Answer: B
22 g of CO2 is 0.5 mol. 8.5 g of NH3 (17 g/mol) is also 0.5 mol so it has the same volume at STP.
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