Free Concentration Units MCQs with Answers
20 Concentration Units MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Concentration units express the amount of solute in a given amount of solution or solvent. Calculations cover molarity, molality, normality, mole fraction, mass percentage, volume percentage, parts per million and dilution, including the effect of temperature on volume-based units and the distinction between molarity and molality.
Last updated
20 questions
- A. Energy of solution
- B. Enthalpy
- C. Energy of solvation
- D. None of the above
Explanation: The explanation for this question will be added soon.
Correct answer: Energy of solvation2. Which term describes a solution in which dissolved solute is in equilibrium with undissolved solute?
- A. Dilute
- B. Saturated
- C. Unsaturated
- D. Supersaturated
Explanation: A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the…
Correct answer: Saturated- A. Immiscible
- B. Highly soluble
- C. Insoluble
- D. Partially soluble
Explanation: There are three essential plant nutrients for healthy growth: nitrogen (N), phosphorous (P), potassium (K).
Correct answer: Highly soluble- A. 36.5 g/mol
- B. 38.0 g/mol
- C. 100 g/mol
- D. 11.73 g/mol
Explanation: Explanation:Ar of H is 1 and Ar of Cl is 35.5. Mr = 35.5 + 1 = 36.5 g/mol
Correct answer: 36.5 g/mol- A. 5.65
- B. 7.69
- C. 5.20
- D. 4.11
Explanation: A is correct since the solution is given asGiven: Water = 103 g(1 kg), Oxygen = 5.65 x 10-3 gRequired : Oxygen in ppm = ?Formula : Ppm =…
Correct answer: 5.65- A. The hydrogen ion, H+
- B. The hydroxide ion, OH-
- C. The sodium ion, Na+ (aq)
- D. The sulphate ion, SO4-2 (aq).
Explanation: .Na+ ions will be present in the highest concentration since there are 2 moles of Na+ in each mole of Na2SO4, so the concentration of Na+…
Correct answer: The sodium ion, Na+ (aq)- A. 0.34 molal
- B. 0.25 molal
- C. 2 molals
- D. 0.02 mol
Explanation: 2% solution by weight means 2 grams of NaCl is dissolved per 100 grams of water. No.
Correct answer: 0.34 molal- A. 0.1
- B. 0.9
- C. 0.0177
- D. 1.0
Explanation: Explanation for this question will be added soon.
Correct answer: 0.1- A. 25
- B. 60.1
- C. 87.5
- D. 93.2
Explanation: The correct option is c 87.5 mL M1V1=M2V2 Where, M1⇒ Molarity of the initial solution = 3.5 M V1⇒ Volume of the initial solution = 50 mL…
Correct answer: 87.5- A. Conical flasks
- B. Beakers
- C. Volumetric flask
- D. Measuring cylinder
Explanation: Volumetric flasks, on the other hand, are specifically designed for accurate measurement of a specific volume and are the preferred choice…
Correct answer: Volumetric flask- A. 0.03
- B. 0.02
- C. 0.04
- D. 0.01
Explanation: 0.01: This option is correct. The ionic strength is equal to 0.01. In this case, the concentration of both the barium ions (Ba2+) and…
Correct answer: 0.01- A. 0.03
- B. 0.02
- C. 0.04
- D. 0.01
Explanation: We know that:Ionic strength (I) = ½ (m1z1² + m2z2²)Where,m1 = concentration of Ba2+ = 0.01m2 = concentration of Cl- = 0.01 × 2 = 0.02z1 =…
Correct answer: 0.03- A. 0.01 molal
- B. 0.1 molal
- C. 1.1 molal
- D. 1.0 molal
Explanation: Mass of ethanol (solute) = 2.3gMass of water (solvent) = 500gFirst, we need to convert the mass of ethanol to moles.
Correct answer: 0.1 molal- A. Move towards cathode
- B. Move towards anode
- C. React with water
- D. Remain neutral
Explanation: Sucrose molecules are electrically neutral, meaning they have an equal number of positive and negative charges.
Correct answer: Remain neutral- A. 0.15 M
- B. 1.5 M
- C. 0.75
- D. None
Explanation: The calculations are shown below : The chemical equation used in this titration is : HCl+KOH→KCl+H₂O In this chemical reaction, the molar…
Correct answer: 0.15 M- A. 0.1
- B. 10.0
- C. 1.0
- D. Zero
Explanation: The fundamental concept of mole fractions dictates that the sum of the mole fractions of all components in a solution, including both…
Correct answer: 1.0- A. 0.001 M
- B. 0.01 M
- C. 1.0 M
- D. 10.0 M
Explanation: To find the new concentration after dilution, use the formula M1V1 = M2V2.
Correct answer: 0.01 M- A. 0.4M
- B. 4M
- C. 0.2M
- D. 0.1M
Explanation: M = 4/40 / 250/1000 = 0.4,where 4g is the amount of NaOH, 40 is the grams per mole of NaOH, 250mL is the amount of water and 1000 is the…
Correct answer: 0.4M- A. 3.8 ppm
- B. 38 ppm
- C. 0.38 ppm
- D. 380 ppm
Explanation: The concentration of mercury is calculated by the formula:ppm = (mass of solute / mass of solution) x 106Given that you have 3.8 x 103g of…
Correct answer: 3.8 ppm- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Students should remember that a billion has 9 zeros so option C and D can be eliminated.
Correct answer: Option BConcentration Units MCQs: common questions
Are these Concentration Units MCQs free?
Yes. All Concentration Units MCQs from Chemistry are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.
How many Concentration Units MCQs are on this page?
There are 20 Concentration Units MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Concentration Units MCQ have an explanation?
Yes. Each Concentration Units question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Concentration Units test?
Yes. The practice button on this page starts a free Concentration Units test drawn from the Chemistry bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.