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

Which of the following is the name of NaClO2?

  1. Sodium chlorate

  2. Sodium chloride

  3. Sodium chlorite

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

Suffix ‘ite’ is used, if number of oxygen atoms is less. Suffix ‘ate’ is used, if number of oxygen atoms is more. Sodium chlorite has formula NaClO2, while formula of sodium chlorate is NaClO3.

Multiple choice

In which of the following is hard water produced?

  1. Saturation of water with calcium carbonate

  2. Saturation of water with magnesium carbonate

  3. Saturation of water with calcium sulphate

  4. Addition of sodium sulphate to water

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

Ca and Mg soluble sulphates and chlorides cause permanent hardness. 

Multiple choice

Which of the following combinations of salts and their uses is incorrect?

  1. Silver nitrate - To develop photographic films

  2. Calcium carbonate - In marbles for flooring

  3. Sodium bicarbonate - To make chalk

  4. Ammonium nitrate - In explosives

  5. Sodium carbonate - In detergents
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Calcium carbonate is used to make chalk. Sodium bicarbonate is used in bakery and medicines.

Multiple choice

Which example shows a chemical change that causes decomposition?

  1. leaves growing on a tree

  2. a branch breaking into smaller pieces

  3. fruit decaying on the ground after falling off a tree

  4. flower petals wilting due to a lack of water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Decay or decomposition is a chemical process where organic matter is broken down into simpler substances by microorganisms, changing its chemical composition.

Multiple choice

What is not produced by the galvanic modality?

  1. lye

  2. chemicals

  3. heat

  4. sodium hydroxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The galvanic modality uses direct current to create a chemical reaction (electrolysis) that produces sodium hydroxide (lye). It does not produce heat; heat is the primary product of the thermolysis (high frequency) modality.

Multiple choice

In galvanic electrolysis, the chemical agent the destroys hair is

  1. Sodium Hydroxide

  2. Hydrochloric Acid

  3. HCl

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

Galvanic electrolysis uses direct current to cause a chemical reaction in the follicle. This reaction produces sodium hydroxide (lye), which is the caustic agent that destroys the hair root.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Gypsum is added to cooled clinker during cement manufacture:

  1. because gypsum permits formation of fine powder

  2. to delay the initial setting time of cement

  3. to increase the hardening of cement

  4. to increase the strength of set concrete
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gypsum is a mineral and is hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process.

Gypsum is added to control the “setting of cement”. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Gypsum is added to cement because:

  1. it makes the cement very hard

  2. it increases the pace of setting of cement

  3. it slows down the initial setting of cement when water is added

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gypsum plays an important role in controlling the rate of hardening of the cement. During cement manufacturing process upon cooling of clinker a small amount of gypsum is added during the final grinding process. Gypsum controls the setting of the cement and if not added the cement will set immediately leaving no time for concrete placing.