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 chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

When a mixture of common salt and ammonium chloride is heated, white fumes are liberated which change into a white deposit when cooked. What is this substance?

  1. Ammonium chloride

  2. Common salt (sodium chloride)

  3. A mixture of ammonium chloride and common salt

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

On heating the mixture of common salt and ammonium chloride in a china dish white fumes evolve and rise inside the funnel the china dish and cover it, to collect the fumes of the sublimating substance.

We collect fumes of ammonium chloride not of common salt because ammonium chloride is a sublimating substance and common salt is not a sublimating substance.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Compounds evaporating easily and giving off a smell are:

  1. ionic compounds.

  2. covalent bonds.

  3. metallic bonds.

  4. diatic bonds.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Odour is the result of the compound vaporising, or at least being a gas, so that your olfactory system is capable of detecting it. If a compound is not so volatile that it vaporises at room temperature, it will not give off an odour.Compounds like methane, benzene etc. that possess covalent bonds are volatile at room temperature hence, gives off smell.

Multiple choice biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

Permutit is the trade name of a mixture of?

  1. Hydrated silicates of Ca and Mg

  2. Hydrated silicates of Al and Na

  3. Hydrated aluminates of Ca and No

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The permutit process is a process in where hard water containing such as Calcium is filtered through natural sand called the zeolite.
This is the hydrated silicate of Ca and Mg.
So, the correct option is 'Hydrated silicates of Ca and Mg'
Multiple choice biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

Hard water does not easily produce lather with soap because it contains:

  1. Only $Mg^{2+}$ ions
  2. Only $Ca^{2+}$ ions
  3. Both $Mg^{2+}$ and $Ca^{2+}$ ions
  4. Both $Na^+$ and $K^+$ ions
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hard water contains dissolved calcium and magnesium salts. These ions react with soap to form insoluble precipitates (scum), preventing the formation of lather.

Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

Sodium is obtained by the electrolysis of:

  1. an aqueous solution of sodium chloride

  2. an aqueous solution of sodium hydroxide

  3. fused sodium chloride

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

Sodium is obtained by the electrolysis of fused mixture of $NaCl$ and $CaCl _2$ (Down's process). Reaction can be written as:

$2NaCl \rightarrow 2Na + {Cl} _2$


Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following is not a compound?

  1. Sulphur dioxide

  2. Chalk

  3. Lead

  4. Sulphuric acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lead $(Pb)$ is not a compound. It is an element present in its pure form so it a single homogeneous identity. Compounds have two or more elements present in the uniform composition in the compound state.


Sulphur dioxide $(SO _2)$ is formed by two elements namely, sulphur and oxygen.

Sulphuric acid $(H _2SO _4)$ is a compound formed by hydrogen, sulphur and oxygen.
The chemical formula for chalk is CaCO3 which is made up of carbon, calcium and oxygen.

Hence, option $C$  is correct.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Identify the compounds among the following:


(a) Milk (b) Sodium (c) Calcium Carbonate (d) Methane

  1. Milk, Calcium carbonate

  2. Sodium

  3. Calcium carbonate, Methane

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

Compounds is a pure substance made up of two or more elements combined chemically in a definite (or constant) proportion by mass.


Calcium carbonate is $CaCO _3$, Methane is $CH _4$ --- Compound.

Sodium ----- Element.

Milk ---------- Mixture.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

$\displaystyle Ca+C _{2} \rightarrow CaC _{2}\xrightarrow{N _{2}}A$
Compound ( A ) is used as a / an :

  1. fertilizer

  2. dehydrating agent

  3. oxidising agent

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

Calcium carbide reacts with nitrogen at high temperature to form calcium cyanamide which is used as fertilizer.
$\displaystyle Ca+C _{2} \rightarrow CaC _{2}\xrightarrow{N _{2}}CaCN _2 + C$

Multiple choice geography mineral and energy resources - i iron and steel industries iron and steel industry mineral based industries

Why is Mica used in toothpaste ?

  1. It makes toothpaste white

  2. It makes toothpaste sparkle

  3. It makes toothpaste soft

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • In opaque toothpaste, hydrated silica acts as a secondary abrasive.
  •  Mica is from the phyllosilicate mineral family — powdered white mica is used in a number of cosmetics, including toothpaste, for its sparkle.
  •  It is also used as a mild abrasive to aid in polishing of the tooth surface.
Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Match the correct use for the following chemicals:

$ KClO 3 $ is used ______.

$ KClO _4 $ is used as ________.

$ Mg(ClO _4) _2 $ is used as ________.

  1. $ KClO _3 $- Explosive
  2. $ KClO _4 $- Fireworks and flares
  3. $ Mg(ClO _4) _2 $- Dry batteries
  4. $ KClO _3 $- Fireworks and flares
  5. $ Mg(ClO _4 ) _2$- Explosive
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

$ KClO _3 $- Explosives.May explode under prolonged exposure to heat or fire.


$ KClO _4 $- Fireworks and flares. It is an oxidizer in the sense that it exothermically transfers oxygen to combustible materials, greatly increasing their rate of combustion relative to that in air.


$ Mg(ClO _4) _2 $- Dry batteries.It is drying agent for gases. It can remove water from gases (with no organic contaminants) at the rate of 0.001mgwater/l.