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 can be excluded from the properties of detergents?

  1. Detergents are sodium salts of long chain benzene sulphonic acid

  2. Calcium and magnesium salts of detergents are insoluble in water.

  3. Synthetic detergents are prepared from hydrocarbons of petroleum

  4. Most of the detergents are non-biodegradable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Calcium and magnesium salts of detergents are soluble in water. Therefore, cleansing action of detergents remains unaffected in hard water.

Multiple choice

Which of the following sequence correctly represents the percentage of given salts in sea water in decreasing order?

  1. Magnesium chloride - Sodium chloride - Magnesium sulphate - Calcium sulphate

  2. Magnesium sulphate - Magnesium chloride - Calcium sulphate - Sodium chloride

  3. Sodium chloride - Magnesium chloride - Magnesium sulphate - Calcium sulphate

  4. Sodium chloride - Magnesium sulphate - Magnesium chloride - Calcium sulphate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sea water contains various dissolved salts, with sodium chloride (NaCl) being the most abundant at about 77.8%, followed by magnesium chloride (MgCl2) at about 10.9%, magnesium sulphate (MgSO4) at about 1.2%, and calcium sulphate (CaSO4) at about 0.3%. The decreasing order correctly represents their relative abundance in ocean water.

Multiple choice

The mixture of RDX, TNT and aluminium powder is

  1. DBX

  2. Tropex

  3. Cordite(MD)

  4. Cordite

  5. (1) and (2) both are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is wrong because these are the secondary explosives. 50% more powerful than TNT by mass, torpex comprises of 42% RDX, 40% TNT, and 18% powdered aluminium.

Multiple choice

Which of the following statements is/are false?

a. Sodium hypochlorite is a bleaching agent that is used in making household bleaches. b. The solution of washing soda in water is alkaline that turns blue litmus red. c. Washing soda is one of the few metal carbonates that are soluble in water.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false. The solution of washing soda in water is alkaline that turns red litmus blue.

Multiple choice

What is iodised table salt?

  1. An element

  2. A compound

  3. A heterogeneous mixture

  4. A homogeneous mixture
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Iodised table salt is a uniform mixture of sodium chloride and potassium iodide (along with anticaking agents), where the composition is uniform throughout, making it a homogeneous mixture (solution).

Multiple choice

Epsom salt is chemically known as

  1. potassium chloride

  2. potassium nitrate

  3. ammonium carbonate

  4. magnesium sulphate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Epsom salt is magnesium sulfate (MgSO4·7H2O). It is named after Epsom, England where it was originally obtained from mineral springs. The other options are different salts: potassium chloride, potassium nitrate, and ammonium carbonate.