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 difference between a solution with a pH of 9 and one with a pH of 8?

  1. the pH of 9 has more hydronium ions than the pH of 8

  2. the pH of 9 has less hydronium ions than the pH of 8

  3. the pH of 8 has more hydronium ions than the pH of 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pH scale is logarithmic; a lower pH indicates a higher concentration of hydronium ions. Therefore, a pH of 8 has 10 times more hydronium ions than a pH of 9.

Multiple choice

Molarity of a solution is expressed as:

  1. the number of moles of a solute present in one litre of the solution.

  2. the number of moles of a solute present in 1000 gm of the solvent

  3. the number of gram equivalent of solute present in one litre of solution.

  4. the ratio of the number of moles of solute to the total number of moles o
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Molarity is defined as the number of moles of solute per liter of solution.

Multiple choice

The pH of normal precipitation is:

  1. slightly acidic

  2. slightly basic

  3. exactly neutral

  4. strongly basic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Normal precipitation has a pH of approximately 5.6 because atmospheric carbon dioxide dissolves in rainwater to form weak carbonic acid, making it naturally slightly acidic.

Multiple choice

What pH is an acid?

  1. 1-6

  2. 7

  3. 5-8

  4. 8-14
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pH scale ranges from 0 to 14. Acids have a pH less than 7, while bases have a pH greater than 7.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Which of the following statement is correct?

  1. Magnesium oxide is highly soluble in water

  2. Magnesium oxide is slightly solution in water

  3. Magnesium oxide is insoluble in water

  4. All alkaline earth metal oxides are insoluble in water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Option $(B)$ is correct.

Magnesium oxide is slightly soluble in water.It is due to an intramolecular force of the magnesium oxide compound. In fact, magnesium oxide is very small, and the attraction forces are very strong to be broke apart when reacted with water.

Multiple choice

The pH of saliva is approximately

  1. 2

  2. 7

  3. 9

  4. 12
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Saliva is generally neutral, with a pH typically ranging between 6.2 and 7.6, making 7 the best approximation.