Chemistry

Solutions and pH Chemistry

451 Questions

Solutions and pH chemistry focus on the acidity or alkalinity of various substances, from human urine to acidic soils. Questions involve titration calculations, molarity determination, and understanding mole fractions. This topic is a staple in the chemistry sections of state and national level competitive exams.

Calculating solution molarityMole fraction calculationpH value interpretationAcidic soils and pHTitration and neutralization

Solutions and pH Chemistry Questions

Multiple choice

Which of the following statements is/are correct about molarity?

  1. Molarity is the number of moles of solute per litre of the solution.
  2. Molarity is better than molality concentration term.
  3. Molality is better than molarity concentration term.

  1. 1 and 3

  2. Only 2

  3. 1, 2 and 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct answer. Number of moles of solute per litre of the solution is molarity. Molality is better concentration term than molarity.

Multiple choice

Match the entries ||| |---|---| |Term|Definition| |A. Molality|1. The number of equivalent weights of solute per litre of solution| |B. Molarity|2. The number of moles of solute per litre of solvent| |C. Normality|3. The number of moles of solute per kg of solvent|

  1. A – 1; B – 2; C – 3

  2. A – 1; B – 3; C – 2

  3. A – 2; B – 1; C – 3

  4. A – 3; B – 2; C – 1

  5. A – 2; B – 3; C – 1
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct answer is A – 3; B – 2; C – 1.

Multiple choice

In man, the pH of saliva varies from

  1. 8.0 to 10.0

  2. 7.5 to 8.0

  3. 7.5 to 9.0

  4. 6.7 to 7.2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Human saliva is slightly acidic to neutral, with pH typically ranging from 6.2 to 7.6. The range of 6.7 to 7.2 represents the normal physiological variation in healthy individuals. Options A, B, and C are incorrect because they indicate alkaline ranges that are not found in normal human saliva.

Multiple choice

The solute particle size in suspensions is

  1. less than 100 nm

  2. more than 10–5 cm

  3. more than 10–8 m

  4. between 1 nm and 100 nm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 The size of solute particles in suspension is more than 10–5 cm.

Multiple choice

If 1 mole of H3PO4 is reacted with 1 mole of X(OH)2 as: H3PO4 + X(OH)2 → XHPO4 + 2H2O. Then which of the following statements is correct

  1. The equivalent weight of base is (molecular wt./3)

  2. The eq. wt. of H3PO4 is 98/3

  3. The resulting solution is required 1 mole NaOH for completing neutralisation.

  4. 1 mole X(OH)2 more required 1 mole NaOH for complete neutralisation.

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The resulting solution has still one mole H+ ion to be neutralised, so, 1 mole of NaOH is required for complete neutralisation. Hence, this is a correct option.