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 geography production in a factory - a paper mill production in a paper mill information technology industry automobile and electronic industries

What makes your toothpaste white?

  1. Titanium dioxide

  2. White powder

  3. Talcum powder

  4. All of these

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

Titanium dioxide (TiO2) is commonly applied to enhance the white color and brightness of food products. TiO2 is also used as a white pigment in other products such as toothpaste. A small fraction of the pigment is known to be present as nanoparticles.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

The dissolution in water of which of the following substances is endothermic?

  1. Hydrochloric acid

  2. Sodium hydroxide

  3. Pure sodium

  4. Ammonium chloride
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(A) $HCl _{(l)}+H _2O _{(l)}\rightarrow HCl _{(aq)}+$ Heat (exothermic)

(B) $NaOH+H _2O\rightarrow Na^++OH^-+H _2O+$ Heat (exo)
(C) $Na _{(s)}+H _2O\rightarrow NaOH+$ Heat (exo)
(D) $AlCl _3+H _2O\rightarrow Al(OH) _3+3HCl$ (endo)

(D) is endothermic reaction.

Multiple choice evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

In the manufacture of Superphosphate, bone ash is mixed with ___________.

  1. hydrochloric acid

  2. sulphuric acid

  3. nitric acid

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

Superphosphate is the chief material supplying phosphoric acid in fertilizer and may be considered the basis of the modern fertilizer industry. 

It is made by mixing of about equal weight of finely ground phosphate rock and sulphuric acid.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) anomalous properties of lithium group 1 elements: alkali metals properties of s block elements

Which of the following carbonate is not stable to heat.

  1. $Li _2CO _3$
  2. $Na _2CO _3$
  3. $K _2CO _3$
  4. $Rb _2CO _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Li2CO3 is unstable to heat and decomposes to Li2O + CO2 at lower temperatures. Other alkali metal carbonates (Na2CO3, K2CO3, Rb2CO3) are thermally stable due to larger cation size. This is a unique property of lithium carbonate.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) anomalous properties of lithium group 1 elements: alkali metals properties of s block elements

Which of the following will produce $CO _2$ on heating?

  1. $BaCO _3$
  2. $Na _2CO _3$
  3. $MgCO _3$
  4. $CaCO _3$
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

Carbonates of $Li$, $Ca$ $Mg$ decompose on heating and liberate $CO _2$.Carbonates of other alkali metals are stable towards heat and decomposed only by fusion. 

Multiple choice economics environment pollution international efforts for conserving biodiversity effects of pollution on environment government efforts in pollution control

Which chemical was used for cleaming equipements?

  1. $CO _{2}$
  2. $Cl$
  3. $CacO _{3}$
  4. $CFCs$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chlorofluorocarbons (CFCs) were widely used as refrigerants, propellants, and solvents for cleaning electronic equipment before their ozone-depleting properties were discovered and they were phased out.

Multiple choice chemistry basic concepts of chemistry law of multiple proportion law of multiple proportions laws of chemical combination

Which one of the following pair of compounds illustrates the law of multiple proportions?

  1. $H _2O, Na _2O$
  2. $MgO, Na _2O$
  3. $Na _2O, BaO$
  4. $SnCl _2, SnCl _4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Law of Multiple Proportions - When two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.  

The elements, tin and chlorine combines in different proportions to form the compounds.

Hence SnCl$ _2$ and SnCl$ _4$ illustrates the law of multiple proportions.  

Hence, the correct option is $\text{D}$
Multiple choice chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

Which one of the following processes will produce hard water?

  1. Saturation of water with $CaCO _3$
  2. Addition of $Na _2SO _4$ to water.
  3. Saturation of water with $MgCO _3$
  4. Saturation of water with $CaSO _4$
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation

Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of calcium and magnesium-containing minerals such as limestone, chalk and dolomite.
The following processes will produce hard water
1. saturation of water with $CaCO _3$
2. saturation of water with $MgCO _3$
3. saturation of water with $CaSO _4$
Hence options A,B & D are correct.

Multiple choice chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

Which of the following is not true?

  1. Hardness of water depends on its behaviour towards soap

  2. The temporary hardness is due to the presence of Ca and Mg bicarbonates

  3. Permanent hardness is due to the presence of soluble Ca and Mg sulphates

  4. Permanent hardness can be removed by boiling the water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Permanent hardness is the hardness that cannot be removed by boiling. It is usually caused by the presence of calcium sulphate or magnesium sulphates or chlorides, nitrates of Ca, Mg in the water which does not precipitate out as the temperature increases.


Hence, option D is correct.

Multiple choice chemistry hydrogen and its compounds heavy water study of heavy water hard water and soft water

Hardness of water can be detected with:

  1. $Na _{2}CO _{3}$ solution

  2. soap water
  3. dil. $HCl$
  4. acidified $KMnO _{4}$ solution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hardness of water can be detected with soap water. Water is described as being 'hard' if it does not lather readily with soap. 

'Soft water', on the other hand, is described as the one, which lathers readily with soap. Chemically, natural water is never pure and contains varying amounts of the dissolved impurities absorbed from the natural or man made environment. 
When appreciable concentrations of calcium ions $(Ca^{2+})$ or the magnesium ions $(Mg^{2+})$ in the form of their dissolved salts are contained in water, it becomes hard.