Free Fundamental Concepts of Chemistry MCQs with Answers
894 Fundamental Concepts of Chemistry MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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Read the Fundamental Concepts of Chemistry notesFree MDCAT chapter notes with key terms894 questions · page 24 of 45
- A. Same mass but different volumes
- B. Different masses but the same volume
- C. Same mass and same volume
- D. Different volume and different masses
Explanation: Volume = mole x 22.4dm³Moles equal means volume equalMole= Mass/ MrMass = Mole x MrAll gases would have different Mr so Masses are…
Correct answer: Different masses but the same volume- A. 22.4L of CH4 and 11.2L of O2
- B. 44.8L of O2 and 22.4L of SO2
- C. 44.8L of CH4 and 11.2L of SO2
- D. All of the following
Explanation: This answer is correct because all the pairs have same mass.
Correct answer: All of the following- A. 6.02×10²³
- B. 3.61×10²⁴
- C. 3.61×10²³
- D. 6.02×10²⁴
Explanation: 1mol of C2H5OH => 6 atoms of H6.02x10^23 molecules of C2H5OH => 6 x 6.02x10^23 atoms of HHence3.61x10^24
Correct answer: 3.61×10²⁴464. The molar mass of k2SO4 is 174 gram per mole how many k+ ions are there in its one mole of the salt
- A. 1NA
- B. 2NA
- C. 6NA
- D. 7NA
Explanation: Each k2SO4 molecule contains two potassium ions so one mole of the salt contains 6.02x10^23 molecules of salt hence contains 2 x…
Correct answer: 2NA- A. 12.04×10²³
- B. 6.02×10²³
- C. 3.01×10²³
- D. 1.008
Explanation: Mole= Mass/MrMr of H2= 2x1 = 2g/molHence,Mole= 2/2Mole= 1molHence 1 mol of any substance contains 6.02x10^23 molecules
Correct answer: 6.02×10²³- A. 1.2×10²⁴
- B. 1.2×10²³
- C. 12×10²⁴
- D. 6.02×10²³
Explanation: H=1g/mol. O=16g/molMr=16+(1x2) =>18g/molMole=mass/Mr =>36/18 =>2mol1mole=> 6.02x10^23 molecules 2mol=> x molecules x=1.2x10^24
Correct answer: 1.2×10²⁴- A. 6.2×10²³
- B. 2×6.02×10²³
- C. 8×6.02×10²³
- D. 16×6.02×10²³
Explanation: O=16g/molMr=16Mole=mass/Mr =>32/16 =>2mol1mol => 6.02x10^23 molecules 2mol => x molecules x=2 x 6.02x10^23 molecules
Correct answer: 2×6.02×10²³- A. 6.02×10²³ atoms
- B. 3.01×10²³ atoms
- C. 6.04×10²³ molecules
- D. None
Explanation: Each molecule of oxygen gas contains 2 atoms oxygen 1mol => 6.02x10^23 molecules 1/2mol => x molecules Number of molecules= ½ x…
Correct answer: 6.02×10²³ atoms- A. 0.08
- B. 0.80
- C. 80
- D. 1280
Explanation: As the question is talking about oxygen molecules we will take molecular mass as 32g/mol 1mole => 6.02x10^23 molecules xmole => 1.5x10^22…
Correct answer: 0.80470. Choose the correct option recording number of particles associated with one mole of a substance
- A. 6.03×10²³
- B. 6.01×10²³
- C. 6.02×10²³
- D. 6.04×10²³
Explanation: This is the correct answer.To remember this value there is a mnemonic as follow"Avagadro's number is 6.022 and it's like a mole's zoo"
Correct answer: 6.02×10²³- A. 6.02×10²³
- B. 3.01×10²²
- C. 6.02×10²²
- D. 3.01×10²³
Explanation: H=1g/mol. O=16g/mol.Mr of H2O= (2x1) + 16 =18g/molMole=Mass/MrMole= 9/18 =1/2mol1mole => 6.02x10^23 molecules 1/2mole => x molecules x=…
Correct answer: 3.01×10²³- A. 3.01×10²³ atoms
- B. 12.04×10²³ atoms
- C. 6.02×10²³ atoms
- D. 1.46×10²³ atoms
Explanation: Ar of Na= 23g/moleMole=Mass/Mr Mole= 46/23Mole= 2mole1mole => 6.02x10^23 atoms2mole => x atomsx= 12.04x10^23 or 1.204x10^24
Correct answer: 12.04×10²³ atoms- A. 6.02×10²³
- B. 1.204×10²⁴
- C. 3.01×10²³
- D. None
Explanation: C= 12g/mol. O= 16g/mol.Mr of CO2= 12 + (16x2) = 44g/molMole=Mass/MrMole= 88/44Mole= 2mol1mole => 6.02x10^23 molecules2mole => x molecules…
Correct answer: 1.204×10²⁴- A. 1.5×10²³
- B. 1.5×10²⁴
- C. 3.0×10²³
- D. 2.5×10²³
Explanation: When one molecule of Al2(SO4)3 is dissolved in water five particles are produced hence when 3.01x10^23 molecules of Al2(SO4)3 are…
Correct answer: 1.5×10²⁴- A. 4.3 x 10^-3
- B. 4.01 x 10^-2
- C. 4.03 x 10^-1
- D. 4.3 x 10^-2
Explanation: Ar of Na= 23g/molMole=Mass/MrMole= 0.1/23Mole= 4.3x10^-3
Correct answer: 4.3 x 10^-3- A. 2×6.022×10²³ atoms
- B. 35.5×6.022×10²³ atoms
- C. 2×10²³ atoms
- D. 2×6.02×10²² atoms
Explanation: 1mol of Cl contains 6.022x10^23 atoms hence 2mol contains 2 x 6.022x10^23.
Correct answer: 2×6.022×10²³ atoms- A. One mole of water (H2O)
- B. One mole of methane (CH4)
- C. One mole of glucose (C6H12O6)
- D. One mole of hydrogen peroxide (H2O2)
Explanation: This answer is correct because one mole of glucose has highest number of atoms.
Correct answer: One mole of glucose (C6H12O6)- A. 0.053
- B. 0.51
- C. 1.8×10²³
- D. None
Explanation: at S.T.P one mole of any gas occupies 22.414dm3.1200cm3/1000 => 1.2dm31mol => 22.414dm3xmol => 1.2dm3x= 0.053mol
Correct answer: 0.053- A. 5g
- B. 10g
- C. 20g
- D. 40g
Explanation: One mole of the monoatomic gas have weight equal to atomic mass of the gas hence xg => 22.414dm320g => 44.8dm3x=10g.
Correct answer: 10g- A. Mole
- B. Molecular weight
- C. Molecular mass
- D. None of these
Explanation: The Avagadro's number is a constant representing the number of atoms or molecules in one mole of a substance and the term "mole" is the…
Correct answer: Mole