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

Soaps form scum with

  1. soft water

  2. hard water

  3. distilled water

  4. mineral water

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

Soaps form scum with hard water.

Multiple choice

The scientific name of Alam used for water filtration is

  1. sodium sulphate

  2. nitric sulphate

  3. alluminium phosphate

  4. alluminium sulphate

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Alum (aluminum sulfate) is commonly used in water treatment as a coagulant to remove impurities. It causes suspended particles to clump together for easier removal through sedimentation and filtration. The correct spelling is 'aluminum' not 'alluminium'.

Multiple choice

Which of the following statements is false regarding the pearls?

  1. A pearl is made up of calcium carbonate.

  2. The unique luster of pearls depends upon the reflection, refraction and diffraction of light.

  3. Pearls can be dissolved in vinegar.

  4. Nacreous pearls are primarily produced by bivalves or clams.

  5. Cultured pearls are the response of the shell to a tissue regeneration.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Cultured pearls are the response of the shell to a tissue implant. A tiny piece of mantle tissue from a donor shell is transplanted into a recipient shell.

Multiple choice

The sodium compound commercially used in manganese testing is

  1. sodium bis(trimethylsilyl)amide

  2. Sodium bismuthate

  3. Sodium bisulphate

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

Sodium bismuthate, also known as sodium bismuth oxide, is a slightly hygroscopic chemical compound with the chemical formula of NaBiO3. Sodium bismuthate is an oxidizer. It is insoluble in cold water, but decomposes when placed in hot water. Sodium bismuthate is commercially used in manganese testing.

Multiple choice

Which of the following is a uranium salt ?

  1. Sodium chromate

  2. Sodium cyanide

  3. Sodium cyanoborohydride

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

Sodium diuranate, Na2U2O7·6H2O, is a uranium salt also known as the yellow oxide of uranium. Along with ammonium diuranate, it was a component in early yellowcakes, the ratio of the two species determined by process conditions; yellowcake is now largely a mix of uranium oxides. It is commonly referred to by the initials SDU.

Multiple choice

Phytotoxic subtances are poisonous to plants. Among the following compounds which one is a phytotoxic compound ?

  1. Sodium carbonate

  2. Sodium chlorate

  3. Sodium chloride

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

Sodium chlorate is a chemical compound with the chemical formula (NaClO3). When pure, it is a white crystalline powder that is readily soluble in water. It is hygroscopic. Sodium chlorate is used as a non-selective herbicide. It is considered phytotoxic to all green plant parts. It can also kill through root absorption.

Multiple choice

Among the following ----------------------- is a major component of laundry detergent.

  1. sodium dodecyl sulphate

  2. Sodium dodecylbenzenesulphonate

  3. Sodium erythorbate

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

Sodium dodecylbenzenesulphonate is a series of organic compounds with the formula C12H25C6H4SO3Na. It is a colourless salt with useful properties as a surfactant. It is usually produced as a mixture of related sulphonates. It is a major component of laundry detergent.

Multiple choice

Compound used in some eco-friendly cleaning products is

  1. sodium nitrite

  2. Sodium orthovanadate

  3. Sodium oxide

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

Sodium percarbonate is a chemical, an adduct of sodium carbonate and hydrogen peroxide (a perhydrate), with formula Na2CO3 ·1.5H2O2. It is a colorless, crystalline, hygroscopic and water-soluble solid. It is used in some eco-friendly cleaning products and as a laboratory source of anhydrous hydrogen peroxide.

Multiple choice

The colored soap bubbles are commercially known as

  1. zubbles

  2. lactone

  3. vinaigrette

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

Zubbles is a commercial name for colored soap bubbles. Zubbles claim to fame is that they are the first colored soap bubbles that do not leave stains. Instead they fade away with exposure to air, pressure zand water.

Multiple choice

What cause the hardness of water?

  1. Presence of germs and impurities

  2. Presence of more calcium and magnesium ions

  3. Presence of sodium ions

  4. All of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. Excess of calcium and magnesium ions causes water to be hard.

Multiple choice

Which of the following is a mixture?

  1. Potassium carbonate

  2. Potassium carbonate solution Right!

  3. Potassium

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

Potassium carbonate solution is a mixture. Potassium is an element. Potassium carbonate is a compound.