Chemistry · Science General

Common Chemical Compounds and Reactions

1,197 Questions

Common chemical compounds and reactions questions test your knowledge of everyday chemicals, their formulas, and their interactions. Topics include properties of acids and bases, hard water chemistry, and compounds like baking soda and plaster of paris. This section is essential for general science preparation.

Acids and basesPlaster of parisHard water chemistryCommon chemical formulasEveryday chemical reactions

Common Chemical Compounds and Reactions Questions

Multiple choice

Safety matches are made by using

  1. carbon, sulphur and paraffin

  2. potassium chloride, antimony sulphide and glue

  3. lead dioxide, carbon and paraffin

  4. silicon dioxide, sulphur and paraffin
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Safety match heads contain potassium chlorate (an oxidizer), antimony sulfide (fuel), and binding agents. The striking surface contains red phosphorus, which allows the match to ignite only when rubbed against it, preventing accidental ignition from friction alone.

Multiple choice

Which chemical compound is used for the etching of glass?

  1. Sodium bicarbonate

  2. Carbon monoxide

  3. Hydrofluoric acid

  4. Nitric acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydrofluoric acid is unique in its ability to dissolve silica (SiO2), which is the main component of glass. This chemical reaction makes HF extremely hazardous to work with but indispensable for glass etching and frosting applications.

Multiple choice

Washing soda has formula

  1. Na₂CO₃.7H₂O

  2. Na₂CO₃.10H₂O

  3. Na₂CO₃.3H₂O

  4. Na₂CO₃
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Washing soda is Na₂CO₃.10H₂O.

Multiple choice

Which of the following sets is an example of double salt?

  1. Fischer salt, zeise’s salt, gmelin’s salt

  2. Magnus’ green salt, turnbull’s blue, mohr salt

  3. Glauber’s salt, microcosmic salt, carnallite

  4. Potash alum, mohr salt, gmelin’s salt

  5. Tutton salts, bromlite, peyrone's salt
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because all are double salt.

Multiple choice

Oleum is prepared from

  1. sulphuric acid

  2. sulphur dioxide

  3. sulphur trioxide

  4. sulphur and water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ans : 3.

Multiple choice

Give the scientific name of the marble used in buildings.

  1. Hydrated Calcium Sulphate

  2. Calcium Hydroxide

  3. Calcium Carbonate

  4. Sodium Bicarbonate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Marble used in buildings is primarily composed of Calcium Carbonate (CaCO3). Marble is a metamorphic rock formed from limestone under heat and pressure. While the question asks for the 'scientific name,' it's actually seeking the chemical composition of marble, which is indeed calcium carbonate.

Multiple choice

Plaster of Paris is technically known as

  1. potassium permanganate

  2. calcium sulphate

  3. hydrated calcium sulphate

  4. calcium carbonate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plaster of Paris is chemically calcium sulfate hemihydrate (CaSO₄·½H₂O), formed by heating gypsum to remove some water of crystallization. It's called 'hydrated calcium sulphate' because it still contains some water molecules in its crystal structure, unlike anhydrous calcium sulfate. Potassium permanganate and calcium carbonate are entirely different compounds with no relation to Plaster of Paris.

Multiple choice

Which of the following statements is/are correct?

(1) Mild hydrochloric acid is used to get relief from bee sting. (2) Plaster of Paris is mainly an organic compound of calcium.

  1. Only (1)

  2. Only (2)

  3. Both (1) and (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1 is wrong. A basic compound (like baking soda) is used to neutralise the effect of bee sting, which produces formic acid. Statement 2 is correct. Plaster of Paris is mainly an organic compound of calcium. It is basically calcium sulphate.