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 chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Potassium on exposure to air gives:

  1. Potassium peroxide

  2. Potassium superoxide

  3. Potassium dioxide

  4. Potassium oxide
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation

Potassium is an extremely active metal that reacts violently with oxygen in air. Potassium oxidizes faster than most metals and forms oxides with oxygen-oxygen bonds. Three species are formed during the reaction: potassium oxide, potassium peroxide, and potassium superoxide.

$8K + 4O _2 \rightarrow 2K _2O + 2KO _2 + K _2O _2$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Ammonia cannot be dried over regular dehydrating agent like: 

  1. $H _{2}SO _{4}$
  2. $P _{2}O _{5}$
  3. Anhydrous $CaCl _{2}$

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

Ammonia cannot be dried by passing over conc. sulphuric acid because ammonia gas reacts chemically with conc. sulphuric acid to form ammonium sulphate.
2NH3 + H2SO4 (conc.) $\rightarrow$(NH4)2SO4.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Ammonia is dried over:

  1. slaked lime
  2. conc. $H _2SO _4$

  3. quick lime
  4. $BaCl _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
-Ammonia is basic.Hence it can be dried by a basic agent .
So, $CaO$ can be used to dry $NH _3$.
-Slaked lime cannot be used to dry $NH _3$, But dry $Ca$$\left( OH \right) _{ 2 }$ can be used to dry $NH _3$.
-Concentrated $H _2SO _4$ react with $NH _3$ and cannot be used to dry it.
-$BaCl _2$ absorbs $NH _3$ and form $BaCl _2$$.$ $4NH _3$, hence it cannot be used to dry $NH _3$
Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Which of the following chemicals has caused disasters by exploding in the holds of ships in harbours and in warehouses?

  1. Vinegar in bottles under pressure

  2. Ammonium nitrate

  3. Gold chloride

  4. Caustic soda
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonium Nitrate caused an explosion at the Port of Texas City. A ship loaded with $NH _4NO _3$ docked at the Port erupted in flames.

Another ship also carrying $NH _4NO _3$ caught fire in the blast and exploded on the same day.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

When Ammonical common salt solution is saturated with carbon dioxide we obtain ?

  1. $NH _4HCO _3$
  2. $(NH _4) _2CO _3$
  3. $NaHCO _3$
  4. $Na _2CO _3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ammonical solution of common salt.

$CO _2+NH _3+NaCl+H _2O\longrightarrow NaHCO _3+NH _4Cl$
$\therefore$ By treating $CO _2$ with ammonical $NaCl$ we get sodium bicarbonate $(NaHCO _3)$ and ammonium sulphate.
Answer is option C.

Multiple choice

What is the chemical name for table salt?

  1. Sodium Chloride

  2. Sodium Iodine

  3. Sodium

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

Table salt is chemically known as sodium chloride, with the formula NaCl. It is an ionic compound.

Multiple choice

DMSO used as

  1. Chelating agent

  2. Solidifing agent

  3. Cryoprotectant

  4. Gelling agent
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dimethyl sulfoxide (DMSO) is a widely used cryoprotectant in cryopreservation. It prevents the formation of ice crystals that can damage cell membranes and intracellular structures during freezing.

Multiple choice

Sodium

  1. Na

  2. S

  3. So

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

Sodium has the chemical symbol Na, which is derived from its Latin name natrium. S is the symbol for sulfur, and Ne is the symbol for neon.

Multiple choice

Which of these is not a salt?

  1. magnesium sulphate

  2. iron sulphide

  3. tin chloride

  4. zinc nitrate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A salt is typically an ionic compound formed from the neutralization of an acid and a base. Iron sulphide is a binary compound of a metal and a non-metal, but it is generally classified as a sulphide rather than a salt in the context of acid-base chemistry.

Multiple choice

A neutral solution is made when:

  1. two acids are added together

  2. an acid and an alkali are added together

  3. water is added to an acid

  4. water is added to an alkali
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A neutral solution is created through the neutralization reaction between an acid and an alkali, where the pH levels balance out to approximately 7.