Chemistry

Solutions and pH Chemistry

400 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

The pH of arterial blood is ________.

  1. 6.0

  2. 7.0

  3. 7.1

  4. 7.4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Arterial blood pH is normally 7.35-7.45, with 7.4 being the standard value. This slightly alkaline pH is tightly regulated by buffer systems (bicarbonate, hemoglobin, phosphate) and respiratory/kidney mechanisms. pH 7.0 is neutral, 6.0 is acidic, and 7.1 is too low for arterial blood.

Multiple choice

How much volume of 0.25 N acid would be required to react with 0.7 gram of Ca(OH)2?

  1. 78.6 ml

  2. 75.6 ml

  3. 85.6 ml

  4. 74.6 ml

  5. 79.6 ml
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Eq. wt. of Ca(OH)2 = 74/2 = 37
Number of gram eq. of Ca(OH)2 in 0.7 gram = 0.7/37  = 0.0189. According to law of equivalence, 0.0189 gm. eq. of Ca(OH)2 will neutralize 0.0189 gm Eq. of acid.     Since,  0.25 gm acid is present in 1000 ml solution.           1 gm acid is present in 1000/0.25 ml solution. 0.0189 gm acid = (1000 x 0.0189)/20.25 = 75.6 ml solution

Multiple choice

By weight, in a mixture of 5 grams, liquid A makes up 7 percent of solution I and 14.5 percent of solution II. If 3 grams of solution I is mixed with 2 grams of solution II, then liquid A accounts for what percent of the weight of the resultant solution?

  1. 6.09%

  2. 10%

  3. 10.75%

  4. 21.5%

  5. 50%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the mixture of 5 grams, A makes up 7% of 3 grams and 14.5% of 2 grams, or  (21/100 + 29/100) grams or 50/100 grams, or 1/2 gram. So, its percentage in the mixture of 5 grams is (1/2)/5 × 100 =  1/10 × 100 = 10%

Multiple choice

The pH of cytoplasm is

  1. acidic

  2. slightly acidic

  3. alkaline

  4. extremely acidic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cytoplasm is slightly acidic so as to protect the cell from pathogens.

Multiple choice

What is the pH value of human urine?

  1. 2.00

  2. 6.00

  3. 7.5

  4. 8.00
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Normal human urine pH typically ranges from 4.5 to 8.0, with an average around 6.0. A pH of 6.0 represents slightly acidic urine, which is normal. The actual pH varies based on diet, health status, and metabolic needs. pH 2.0 is far too acidic (stomach acid level), while 7.5 and 8.0 are alkaline values that may indicate certain conditions or dietary influences.

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.