Chemistry · Science General

Common Chemical Compounds and Reactions

1,204 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 one of the following is a cathodic corrosion inhibitor?

  1. Phosphate

  2. Chromate

  3. Tungstate

  4. Organic amines
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chemicals, which reduce the rate of corrosion are called corrosion inhibitors. They are of two types: cathodic and anodic. Phosphate, chromate and tungstate protect anode by forming sparingly soluble products, which are adsorbed on the surface of the metal and hence check the corrosion. Cathodic protection is done by organic amines, mercaptans, thiourea and substituted urea. These chemicals retard reduction reaction, taking place at cathode.

Multiple choice

Which of the following statements is false?

  1. White phosphorus shows chemiluminescence.

  2. Mixture of Ca(CN)2 and coke is called nitrolim.

  3. NO2 is called mixed hydride.

  4. Ammonium chloride is known as smelling salt.

  5. Chemical formula of Bengal salt petre is KNO3.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ammonium carbonate, (NH4)2CO3, is called as smelling salt.

Multiple choice

Consider the following statements:

  1. When steam is passed over red-hot coke, CNG is produced.
  2. Potassium permanganate (pink solution) acts an antiseptic solution.

Which of the given statements is/are correct?

  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 incorrect. When steam is passed over red-hot coke, water gas is produced. Compressed natural gas (CNG) is natural gas under pressure. Statement 2 is correct. Potassium permanganate (pink solution) is an oxidizing agent so it is an antiseptic solution.

Multiple choice

Flint glass contains

  1. lead oxide

  2. manganese dioxide

  3. lead dioxide

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

Flint glass has high refractive index and high dispersion. It contains mainly lead oxide.

Multiple choice

Hard glass is prepared by

  1. fusing a mixture of sodium carbonate, calcium carbonate and silica

  2. fusing a mixture of potassium carbonate, calcium carbonate and silica

  3. fusing a mixture of potassium carbonate and any oxide

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

Hard glass is prepared by fusing a mixture of potassium carbonate, calcium carbonate and silica.

Multiple choice

Match the following: Name of salt solution|Nature| |a. Sodium carbonate solution|1. Neutral| |b. Ammonium chloride solution|2. Basic| |c. Sodium chloride solution|3. Acidic|

  1. a - 2, b - 3, c - 1

  2. a - 1, b - 3, c - 2

  3. a - 3, b - 2, c - 1

  4. a - 2, b - 1, c - 3

  5. a - 1, b - 2, c - 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. The nature of sodium carbonate solution is basic. The nature of ammonium chloride solution is acidic. The nature of sodium chloride solution is neutral.

Multiple choice

‘Saponification’ is a process by which ___________.

  1. soap is prepared

  2. plastic is prepared

  3. sulphur is extracted

  4. protein is identified

  5. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The term saponification is the name given to the chemical reaction that occurs when a vegetable oil or animal fat is mixed with a strong alkali. The products of the reaction are two: soap and glycerin. Water is also present, but it does not enter into the chemical reaction. The water is only a vehicle for the alkali, which is otherwise a dry powder. The name saponification literally means "soap making". The root word, "sapo", is Latin for soap. The Italian word for soap is sapone.