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 zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Ecofriendly detergents do not contain

  1. Phosphates and bleaches

  2. Alcohols

  3. Water softeners

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

The eco-friendly detergents are free from the added chemicals, instead they have enzymes to catalyse the reactions. They do not contain phosphates, bleaches, synthetic perfumes, brightening chemicals etc. They contain lipases and proteases that break down the fats and proteins, so they are effective in stain removal. Hence, the correct answer is 'Phosphates and bleaches'.

Multiple choice chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

Which of the following is not an electrolyte?

  1. Sulphuric acid

  2. Lemon juice

  3. Tamarind juice

  4. Detergent solution
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent. Sulphuric acid, lemon juice, and tamarind juice contain ions that conduct electricity, whereas a detergent solution is generally considered a non-electrolyte or a very weak one in this context.

Multiple choice chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

State which of these will act as a non-electrolyte :

  1. Liquid carbon tetrachloride

  2. Acetic acid

  3. Sodium hydroxide aqueous solution acid

  4. Potassium chloride aqueous solution.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nonelectrolytes are compounds that do not ionize at all in solution. As a result, solutions containing nonelectrolytes will not conduct electricity. Typically, nonelectrolytes are primarily held together by covalent rather than ionic bonds. A common example of a nonelectrolyte is glucose. Liquid carbon tetrachloride is also a nonelectrolyte.

Multiple choice salts salts and their classification acids, bases and salts chemistry

Lime water + sulphuric acid $\rightarrow$

  1. Heat + Calcium sulphate

  2. Water + Heat

  3. Calcium sulphate + Water + Heat

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

Lime water/calcium hydroxide $Ca(OH) _2$ is a strong base and sulphuric acid $H _2SO _4$ is a strong acid as they undergo complete dissociation in solution.

When acid and base react with each other, the base neutralizes the acid, leading to the formation of salt and water.
This reaction is known as neutralization reaction and it is exothermic in nature (since heat is released due to formation of new bonds in the reaction).
Thus, more stronger the acid and the base, more amount of heat is released.
$Ca(OH) _2 + H _2SO _4 \rightarrow CaSO _4+2H _2O + Heat$.
Hence, the correct answer is option (C).

Multiple choice salts salts and their classification acids, bases and salts chemistry

Which of the following salts is most basic in aqueous solution?

  1. ${\text{C}}{{\text{H}} _{\text{3}}}{\text{COOK}}\,$
  2. ${\text{FeC}}{{\text{l}} _{\text{3}}}\,\,$
  3. ${\text{Pb(C}}{{\text{H}} _{\text{3}}}{\text{COOK}}{{\text{)}} _{\text{2}}}\,$
  4. ${\text{Al}}{\left( {{\text{CN}}} \right) _{\text{3}}}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

CH3COOK is a salt of a weak acid (acetic acid) and a strong base (potassium hydroxide). In aqueous solution, the acetate ion undergoes hydrolysis to form OH- ions, making the solution basic. The other options involve salts of strong acids or weak bases, which result in acidic or neutral solutions.

Multiple choice physics electrical conductivity of liquids does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

When salt is dissolved in distilled water, we obtain salt solution which is a / an :

  1. conductor of electricity

  2. insulator of electricity

  3. motor of electricity

  4. filament of electricity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When salt is dissolved in distilled water, we obtain salt solution. This is a conductor of electricity.

Multiple choice chemistry materials we use soap and detergents soap soap and detergent

Why is soap referred as a salt?

  1. They are long chain of fatty acids

  2. Made up of various salts

  3. Gives salt on acting with water

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

Many soaps are simply neutralized, long chain carboxylic and/or fatty acids. Usually neutralized by some mineral base. The neutralization reaction of an acid and a base produces a salt.

Multiple choice chemistry materials we use soap and detergents soap soap and detergent

Which of the following is a type of soap?

  1. Hard soap

  2. Soft soap
  3. Both $A$ and $B$

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

Depending upon the nature of alkali used in the production of soap, they are classified into two types.
The sodium salt of long chain fatty acid is known as hard soap.
The potassium salt of long chain fatty acid is known as soft soap, as it produces more lather.

Multiple choice chemistry materials we use soap and detergents soap soap and detergent

What is salting out of soap?

  1. Formation of salt

  2. Formation of acids in aqueous medium

  3. Melting if soap

  4. Precipitation of soap in solid form
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The saponification  reaction is exothermic in nature, because heat is liberated during the process. The soap formed remains in suspension form in the mixture. Soap is precipitated as a solid from the suspension by adding common salt to the suspension. This process is called salting out of Soap.

Multiple choice chemistry materials we use soap and detergents soap soap and detergent

When $NaOH$ is used in making of soap, it is called as:

  1. alkali soap

  2. soft soap

  3. hard soap

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

Soaps are sodium or potassium salts of long chain fatty acids. When triglycerides in fat/oil react with aqueous $NaOH$ or $KOH$, they are converted into soap and glycerol.  The sodium salt of long chain fatty acid is known as hard soap. It is difficult to dissolve in water. It is used as laundry soap.

Multiple choice chemistry materials we use soap and detergents soap soap and detergent

Soaps cannot be used in hard water because they:

  1. contain sodium

  2. form precipitates

  3. create environmental problems

  4. create ozone depletion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Soaps cannot be used in hard water because they forms precipitates. When soaps are used in hard water that contains a lot of calcium and magnesium ions they cause the soap to precipitate and it is unable to form lather. This can be minimized by the addition of chemicals like sodium trimetaphosphate, borax, sodium silicate etc. These prevent the calcium and magnesium ions from reacting with the soap and allow it to form lather, thus forming precipitates.