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

The product of electrolysis of conc. solution of common salt is?

  1. $Na+Cl _{2}$
  2. $H _{2}+O _{2}$
  3. $NaOH+H _{2}+Cl _{2}$
  4. $Na+Cl _{2}+O _{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ionization of salt:

$NaCl\rightarrow Na^{+}+Cl^{-}$

The half-reaction at the cathode is:

$H _2O+2e^{−}\rightarrow H _2+2OH^{−}$

Here, the reduction is taking place.

The half-reaction at the anode is:

$2Cl^{-}\rightarrow Cl _2+1e^{−}$

Here, oxidation is taking place.

The overall reaction is as follows:

$NaCl+H _2O\rightarrow Na^{+}+OH^{−}+H _2+Cl _2$.

Hence, option $C$ is correct.
Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Which impurity (as a salt) is associated with table salt obtained from sea-water?

  1. $NaHCO _3$
  2. $MgCO _3$
  3. $MgCl _2$
  4. $NaI$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sea water contains $MgCl _2$ brine so salt made from sea water contains this as impurity.
sea salt:

 Chloride $(Cl^-)$  55.03%
 Sodium $(Na^+)$  30.59%
 Sulfate $(SO _4^{2-}$ 7.68% 
 Magnesium $(Mg^{2+})$ 3.68% 
 Calcium $(Ca^{2+})$ 1.18% 
 Potassium $(K^+)$ 1.11% 
 Bicarbonate $(HCO _3^-)$ 0.41% 
 Bromide $(Br^-)$ 0.19% 
Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Commercial common salts become slightly damp on keeping. This is due to the fact that:

  1. common salt is hygroscopic

  2. common salt contains some impurities which are hygroscopic

  3. common salt is efflorescent

  4. common salt is crystalline
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commercial common salt commonly becomes slightly damp on keeping because common salt contains some impurities like ${MgCl _2}$ and ${CaCl _2}$ which are hygroscopic in nature and absorb moisture from the atmosphere.
Hence, option B is correct.

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

The commercial salt is purified by passing :

  1. $H _2S$ gas through an alkaline solution ofsalt

  2. HCI gas through a saturated solution of salt
  3. $H _2$ gas through a solution of salt
  4. $CI _2$ gas through a saturated solution of salt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The common table salt is prepared by passing HCI gas through a saturated solution of salt. The precipitation is due to common ion effect.

$\underset { Salt\,solution }{ NaCl }+H^++Cl^-\longrightarrow  \underset { ppt}{ NaCl } $

Hence, option B is correct.

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 zoology excretion to maintain homeostasis other excretory organ role of other organs in excretion accessory excretory organs excretion in other organisms

Which of the following waste can be removed by skin?

(i) Water (ii) Excessive mineral salts (iii) Urea

  1. (i) only

  2. (i), (ii), and (iii)

  3. (i), (iii)

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

The skin acts as an excretory organ by releasing sweat, which contains water, excessive mineral salts, and small amounts of urea, helping to regulate body temperature and remove metabolic waste.

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.