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

Sodium hydroxide is used in the manufacturing of

  1. soap

  2. synthetic fiber

  3. paper

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium hydroxide (caustic soda) is a versatile chemical used in the production of soaps, paper, synthetic fibers like rayon, and many other industrial products.

Multiple choice

Sodium hexametaphosphate is used as a/an

  1. cleansing agent

  2. ion exchange resin

  3. insecticide

  4. softening agent for hard water

  5. hardening agent for soft water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because the sodium carbonate are added in sodium hexametaphosphate to raise the pH. It acts as the breakdown of clay which settles down at the bottom of the surface and hard water changes into soft water.

Multiple choice

The derivatives of pink salt are related to

  1. ammonium chlorostannate

  2. mercurous chloride

  3. stannic sulphate

  4. metastannic acid

  5. microcosmic salt
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because when stannous chloride reacts with ammonium chloride to produce ammonium chlorostannate, they are the derivatives of pink salt. It is used in mordent in dyeing agent.

Multiple choice

What is the chemical name of baking soda?

  1. Sodium hydroxide

  2. Potassium carbonate

  3. Sodium carbonate

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

Baking soda is the common name for sodium bicarbonate, which has the chemical formula NaHCO3.

Multiple choice

Oxygen is prepared on a large scale from

  1. water

  2. calcium carbonate

  3. potassium permanganate

  4. sodium peroxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On a large industrial scale, oxygen is primarily obtained through the fractional distillation of liquid air, but among the choices, water electrolysis is the standard method for producing high-purity oxygen.

Multiple choice

Temporary hardness of water is due to the presence of

  1. magnesium sulphate

  2. calcium chloride

  3. sodium bicarbonate

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

 Temporary hardness is due to the presence of calcium hydrogencarbonate Ca(HCO3)2(aq) and magnesium hydrogencarbonate Mg(HCO3)2(aq). Both calcium hydrogencarbonate and magnesium hydrogencarbonate decompose when heated. The original insoluble carbonate is reformed. This happens when water is boiled. The precipitation reactions are as follows:   

Multiple choice

Which of the following is not correctly matched?

  1. Galena - Lead sulphide

  2. Calomel - Mercurous chloride

  3. Green vitriol - Copper sulphate

  4. Plaster of Paris - Calcium sulphate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Calomel is also called mercurous chloride (Hg2Cl2) or mercury(I) chloride.

Multiple choice

Which of the following is not a base?

  1. Sodium hydroxide

  2. Magnesium hydroxide

  3. Ammonium hydroxide

  4. Calcium carbonate

  5. Ferric oxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Copper carbonate is a salt because bases are oxides or hydroxides of metals, but a salt is a compound made up of an acid, when a metal takes the place of the hydrogen in the acid. Calcium carbonate is formed by the reactions of calcium and carbonic acid.