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 substances in common use salts and their properties study of some important salts salts used in daily life

Crude common salt is hygroscopic because of impurities of:

  1. $CaSO _{4}$ and $MgSO _{4}$
  2. $CaCl _{2}$ and $MgCl _{2}$
  3. $CaBr _{2}$ and $MgBr _{2}$
  4. $Ca\left ( HCO _{3} \right ) _{2}$ and $Mg\left ( HCO _{3} \right ) _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Crude common salt contains impurities such as $ CaSO _{ 4 },   CaCl _{ 2 } ,   MgCl _{ 2} $. Hence it is deliquescent (hygroscopic).

Hence option B is correct.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements biological importance of sodium and potassium

Ripening of fruits can be caried out in presence of :

  1. $Na _2SO _4$
  2. $NaCl$
  3. $CaCl _2$
  4. $CaC _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium carbide (CaC2) reacts with moisture to produce acetylene gas, which acts as a synthetic plant hormone to induce fruit ripening.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements biological importance of sodium and potassium

Ripening of fruits can be carried out in the presence of :

  1. $Na _2SO _4 $
  2. $NaCl$
  3. $CaCl _2$
  4. $CaC _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium carbide is also used for ripening fruit artificially in some countries. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in reaction to the natural ripening agent ethylene.

Hence option  D is correct.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements biological importance of sodium and potassium

The main constituents of pearl are:

  1. ammonium sulphate and sodium carbonate

  2. aragonite are conchiolin

  3. calcium carbonate and magnesium carbonate

  4. calcium oxide and ammonium chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The chief component of the nacre that constitutes the pearl is aragonite $(CaCO _3)$. Nacre also contains a small amount of conchiolin, a hornlike organic substance (albuminoid) that is the main constituent of the mollusk's outer shell.

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

Which one of the following substances is a good oxidising agent?

  1. coke

  2. water

  3. Hydrogen peroxide

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

A good oxidizing agent is one which can readily oxidize other chemical species and reduce itself. Therefore, the compound which is good oxidizing agent must have initial oxidation as high, so that it can reduce its oxidation state and get reduced and oxidize others.

$Coke:$ Reducing agent 
$Hydrogen$ $peroxide$ $(H _2O _2):$ because oxidation state of oxygen is -1 in hydrogen peroxide. So, it oxidizes to 0 & acts as a reducing agent & it reduces to -2 & acts as an oxidizing agent. But, generally, it acts as an oxidizing agent because a stable oxidation state of oxygen is -2(oxide form)
$H _2O:$ Reducing agent.
$SO _2$: sulfur in the +4 oxidation state, sulfur dioxide is a reducing agent. It is oxidized by halogens to give the sulfuryl halides, such as sulfuryl chloride

Hence, the correct option is $\text{C}$

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

What electrolyte is used to electroplate silver onto a spoon?

  1. pure water

  2. silver nitrate

  3. copper sulfate

  4. acidified water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$Ans:$ $Silver$ $Nitrate.$

In silver plating, the object (eg.spood) to be plated is made the cathode of an electrolytic cell. The anode is bar of silver metal and the electrodyte must contain $Ag^+$ ions (i.e. $AgNO _3$), so that when the direct current is passed through the cell, positive ($Ag^+$) ions move towards the negative anode (spoon) where they are neutralized by $e^-$ and stick to spoon as silver metal.

Multiple choice chemistry patterns and properties of metals periodic trends in chemical properties alkali metals study of specific groups

The reaction between sodium and water can be made less vigorous by:

  1. adding a little alcohol

  2. amalgamatic sodium

  3. adding a little acitic acid

  4. lowering the temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If we add sodium to water it floats on the water and reacts very vigorously, rushing around and on the surface producing hydrogen gas and sodium hydroxide. Hence to reduce its vigorousness, it is amalgamated with mercury by making sodium as amalgamating sodium. 

Option (B) is correct.

Multiple choice hunger and dehydration from tasting to digestion digestion of food digestion evs

 What is actually slightly lost during dehydration?

  1. Sodium Chloride

  2. Potassium Chloride

  3. Calcium Chloride

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

Dehydration is the loss of fluid from the body. There are many reasons for dehydration, including heatstroke, strenuous exercise, kidney disease, vomiting and diarrhea and chronic conditions like diabetes. The symptoms of dehydration include dry lips and mouth, rapid heart rate and decreased urine output. Dehydration can affect the concentration of the body's electrolytes, causing a fluid and electrolyte imbalance. Sodium is one of the electrolytes most closely linked to the body's fluid balance, since water tends to go to the areas of higher sodium concentration. Dehydration can cause hyponatremia, or low sodium levels, or hypernatremia, or high sodium levels. Symptoms of low sodium include headache, nausea and vomiting, confusion and fatigue. High sodium can cause increased thirst, confusion and muscle twitching and can lead to seizures and coma.

Multiple choice evs deficiency diseases need for nutrients nutrients needed by the body balanced diet and malnutrition food for health nutrition and its deficiency nutrition and its need

Chlorides are mineral salts, and cannot be affected by

  1. Chemical Actions

  2. Biological Action

  3. Temperature

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

Chlorides are inorganic mineral salts that are highly stable and are not affected by biological processes like decomposition or bacterial action.

Multiple choice reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

Which of the following is used for dissolution of gold ? 

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. Aqua regia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gold,palladium,gallium are all noble metals which are dissolved in aqua regia. It is also known as royal water which is a mixture of hydrochloric acid and nitric acid in the ratio of 3:1 respectively.

Multiple choice chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

What is formed when acids react with carbonates?

  1. Salt

  2. Water

  3. Carbon dioxide

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When acids react with carbonates, such as calcium carbonate (found in chalk, limestone and marble), a salt, water and carbon dioxide are made. In general:
$Acid + Metal\ carbonate \rightarrow Salt + Water + Carbon\ dioxide$

Multiple choice chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

Why there is not much fizz when sulphuric acid and calcium carbonate react with each other?

  1. Salt formed is completely soluble

  2. Salt is not formed at all

  3. Salt formed is not very soluble
  4. $CO _2$ is not formed
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using sulphuric acid and calcium carbonate, you don't get much of a fizz because the calcium sulphate salt formed, is not very soluble, and coats the remaining calcium carbonate inhibiting the reaction. This will happen with any reaction between an acid and a water insoluble reactant which forms an insoluble solid product.