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

Sodium chloride is a ___________.

  1. acid salt

  2. neutral salt

  3. basic salt

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

Sodium chloride is a neutral salt, because it is obtained from neutralization reaction of strong base and strong acid.

Multiple choice

Anhydrous CaO may be used to dry

  1. H2S gas

  2. NH3 gas

  3. CO2 gas

  4. HCl gas
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Anhydrous CaO (quicklime) is a basic drying agent. It reacts with acidic gases, so it can be used to dry basic gases like ammonia (NH3).

Multiple choice

Which of the following is the chemical compound?

  1. Sea water

  2. Lime juice

  3. Hydrochloric acid

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

Hydrochloric acid (HCl) is a chemical compound formed by the chemical combination of hydrogen and chlorine. Sea water and lime juice are complex mixtures of various solutes and solvents.

Multiple choice

Which form of sodium is used to obtain sodium metal?

  1. Molten

  2. Aqueous

  3. a & b both

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

Sodium metal is obtained by the electrolysis of molten sodium chloride (Downs process). Aqueous sodium chloride would result in the production of hydrogen gas instead of sodium metal.

Multiple choice

The safest way to dispose of Na metal is to __________.

  1. add small amounts of Na to propanol-2

  2. add small amounts of Na to ethanol

  3. add small amount of Na to phenol

  4. add small amounts of Na to water

  5. add small amounts of Na to butanol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodium reacts with all liquids having -OH group as water , alcohols, phenols and carboxylic acids. 2- propanol is isopropyl alcohol,  so sodium forms Sodium isopropoxide and evolves hydrogen gas thus this option is used to dispose of Na metal.

Multiple choice

Find the odd one out.

  1. Sugar

  2. Common salt

  3. Sand

  4. Copper sulphate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sugar, common salt and copper sulphate are compounds or pure substances which have a definite formula. For example: sugar - C6H12O6, common salt - NaCl and copper sulphate - CuSO4. Sand does not have a fixed formula and is an impure substance.  

Multiple choice

Middle lamella is mainly composed of

  1. calcium carbonate

  2. calcium oxalate

  3. calcium pectate

  4. magnesium dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Middle lamella is mainly composed of calcium pectate

Multiple choice

The sodium salt used for 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 is a slightly hygroscopic chemical compound with the chemical formula of NaBiO3. It is an oxidizer. It is not soluble in cold water. It also decomposes when placed in acids. It is one of the few sodium compounds that do not dissolve in water. Sodium bismuthate is commercially used in manganese testing.