All Free Chemistry MCQs with Answers
Every Chemistry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,720 questions · page 577 of 686
- A. Some product is lost in the experiment
- B. Reversible reaction may occur
- C. Errors are madein weighing the reactants and the products
- D. The given statement is not correct
Explanation: This answer is correct because actual yield is always less than theoretical yield as theoretical yield is the maximum possible yield in a…
Correct answer: The given statement is not correct- A. Side reactions may produce by product
- B. Some reactions are reversible
- C. Mechanical losss takes place due to filtration and distillation
- D. All of these
Explanation: This answer is correct as all the above options effects the actual yield of a chemical reaction hence this is the best possible option.
Correct answer: All of these- A. 22.4dm³
- B. 11.2dm³
- C. 44.8dm³
- D. None
Explanation: Volume = Moles x 22.4dm3 = 0.5 x 22.4 = 11.2dm³.
Correct answer: 11.2dm³- A. 4 moles of C
- B. Five moles of C
- C. 8 moles of C
- D. None of these
Explanation: The stoichiometric coefficients tell us the molar ratios between the reactants and products.
Correct answer: 4 moles of C- A. 55ml
- B. 58ml
- C. 70ml
- D. 79ml
Explanation: Following is the solution to this question:
Correct answer: 70ml- A. Chemical change
- B. Physical change
- C. Neither chemical nor physical change
- D. CO2 absorbed in Mg(C1O4)2
Explanation: Option a) "Chemical change" is correct because the absorption of CO2 in KOH solution involves a chemical reaction.
Correct answer: Chemical change- A. Side reactions
- B. Reversible nature
- C. Mechanical loss
- D. All of these
Explanation: Due to side reactions, reversible nature of reactions and mechanical loss, actual yield is less than theoretical yield.
Correct answer: All of these- A. 80 moles of atoms.
- B. 40 moles of hydrogen atom.
- C. 30 moles of electrons.
- D. 30 moles of oxygen atoms.
Explanation: 2H + O --> H2O H : H2O 2 : 1 X : 20 X=40 moles of hydrogen atom. (Correct)
Correct answer: 40 moles of hydrogen atom.- A. Is taken in lesser quantity in grams as compared to the other reactant
- B. Is taken in lesser quantity in volume as compared to the other reactant
- C. Gives the minimum amount of the product which is required
- D. Gives equal amounts of the reactants and products
Explanation: The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much…
Correct answer: Gives the minimum amount of the product which is required- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The percent yield equation is: percent yield = actual yield / theoretical yield x 100% The percent yield is the ratio of the actual yield…
Correct answer: Option A- A. 120 ml
- B. 20 ml
- C. 40 ml
- D. 60 ml
Explanation: Following is the solution to this question:
Correct answer: 60 ml- A. 2 x 10^4 molecules
- B. 4 x 10^4 molecules
- C. 4 x 10^2 molecules
- D. None of these options is correct
Explanation: At the same temperature and pressure, equal volume of the gas contains equal number of molecules.
Correct answer: 4 x 10^4 molecules11533. Choose the correct one.
- A. Children usually ask this question why are eggs sold by the dozen.
- B. Children usually ask this question that why eggs are sold by the dozens.
- C. Children usually ask this question why eggs are sold by the dozen.
- D. Children usually ask this question why eggs are sold by dozen.
Explanation: The correct answer is C. Children usually ask this question why eggs are sold by the dozen.
Correct answer: Children usually ask this question why eggs are sold by the dozen.11534. Choose the correct option
- A. It is her and me they are looking for.
- B. It is she and I they are looking for.
- C. It is me and her they are looking up.
- D. It is land she they are looking for.
Explanation: This option is correct. "She" and "I" are subject pronouns, which are correctly used after the verb "to be."
Correct answer: It is she and I they are looking for.- A. high temperature and low pressure
- B. low temperature and high pressure
- C. standard temperature and pressure
- D. any temperature, equally
Explanation: Compressing a gas brings the molecules close enough for their own volume and their mutual attractions to matter, and cooling reduces the…
Correct answer: low temperature and high pressure11536. Choose the correct one.
- A. This is cleanest patch I've ever seen," I bragged.
- B. see," I bragged. This is the cleanest patch I've ever
- C. This is the cleanest patch I've ever seen," I bragged.
- D. This is a cleanest patch I've ever seen," I bragged.
Explanation: The correct answer is option C: This is the cleanest patch I've ever seen," I bragged..
Correct answer: This is the cleanest patch I've ever seen," I bragged.- A. Polar nature of water
- B. H-bonding
- C. Electronegativity difference
- D. All are correct
Explanation: Water is considered a universal solvent due to its multiple properties.
Correct answer: All are correct- A. Hydrogen bonding
- B. Dipole-dipole forces
- C. London dispersion forces
- D. Dipole-induced dipole
Explanation: Force of attraction present between all kind of atoms and molecules are known as London dispersion forces.
Correct answer: London dispersion forces- A. H-bonding
- B. Ionic bonding
- C. Covalent bonding
- D. Metallic bonding
Explanation: Two ice cubes can unite to form one cube when they are pressed against each other due to Hydrogen bonding.
Correct answer: H-bonding- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The general gas equation, also known as the ideal gas equation, is a mathematical equation that describes the relationship between…
Correct answer: Option D