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 principles and processes of isolation of elements concentration of ore concentration of ores principles of metallurgy

Baking powder has one of the following constituents, which is:

  1. $Na _{2}CO _{3}$
  2. $Na _{2}SO _{4}$
  3. $KHCO _{3}$
  4. $NaHCO _{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium bicarbonate, also called sodium hydrogen carbonate, or bicarbonate of soda, $NaHCO _3$, is a source of carbon dioxide and so is used as an ingredient in baking powders, in effervescent salts and beverages, and as the main constituent of dry-chemical fire extinguishers. Its slight alkalinity.

Multiple choice chemistry chemistry in daily life antimicrobials and antifertility drugs therapeutic action of different classes of drugs drugs and their classification

Compound which is added to soap to impart antiseptic properties is:

  1. sodium lauryl sulphate.

  2. sodium dodecylbenzenesulfonate.

  3. rosin.

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

A) Sodium lauryl sulphate - Used in detergents. Common component of cleansing products.

B) Sodium dodecylbenzenesulfonate - Major component of detergent.

C) Rosin - A solid form of resin obtained from pines.

D) Bithionol - Antiseptic added to soap. Used to treat tapeworms and liver flukes.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

An oxide which forms salts when it reacts with both acids and alkali is :

  1. acidic oxide

  2. basic oxide

  3. amphoteric oxide

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

An oxide which forms salts when it reacts with both acids and alkali is knwn as amphoteric oxides. $e.g.$ $Al _2O _3$.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which one among the following can be classified as amphoteric?

  1. $Na _3PO _4$

  2. HCl

  3. NaOH
  4. $HSO^- _4$
  5. $C _2O^{2-} _4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$\displaystyle HSO^- _4$ can be classified as amphoteric. It can donate a proton and act as an acid. At the same time, it can accept a proton and act as a base.
$\displaystyle HSO^- _4 \rightarrow H^+ + SO _4^{2-}$
$\displaystyle HSO^- _4 + H^+ \rightarrow H _2SO _4$

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Additive-stabilizer used in butter is________________.

  1. Disodium dihydrogen diphosphate

  2. Trisodium diphosphate

  3. Tetrasodium diphosphate

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

Various phosphate salts, including disodium, trisodium, and tetrasodium diphosphates, are used as emulsifiers and stabilizers in dairy products like butter and processed cheese.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Which of the following has a low calcium and magnesium content?

  1. Soft water

  2. Hard water

  3. Contaminated water

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

Soft water is surface water that contains low  concentrations of ions and in particular is low in ions of calcium and magnesium. Soft water naturally occurs where rainfall and the drainage basin of rivers are formed of hard, impervious and calcium poor rocks.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

What is the advantage of using detergents over soap in hard water?

  1. can be used with both hard and soft water

  2. used in acidic solutions

  3. prepared from hydrocarbons of petroleum

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

Soaps are not suitable when hard water is used. Detergents can be used with both hard and soft water. Detergents are more soluble in water than soaps. They also have a stronger cleansing action than soaps. Detergents don't need expensive vegetable oil for their preparation as they can be prepared from hydrocarbons of petroleum. They can be used in acidic solutions whereas soaps cannot be used (free fatty acids are precipitated).

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

A soap is :

  1. sodium or potassium salt of organic acid

  2. sodium salts of sulphonic acid

  3. both a and b

  4. chloride salts of organic and sulphonic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soap is the sodium and potassium salt of organic fatty acid. Soap reacts with hard water forming scum. They are derived from the treatment of tryglycerides with a strong base (saponification). Soaps are made by rendering fats from animal sources.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Sodium salts of sulphonic acid are :

  1. soap

  2. detergents

  3. hard water

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

Detergents are soap-like compounds which are used for cleaning purpose. They are sodium salts of long chain alkyl benzene sulphonic acids or sodium salts of long chain alkyl hydrogen sulphate, whereas, soaps are sodium salts of long chain carboxylic acids.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Washing soda soften both temporal and permanent hardness by :

  1. Dissolving salts

  2. Forming precipitate

  3. Forming soluble salts

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

Permanent hard water can be made soft by adding sodium carbonate (also called washing soda) to it. This will soften both temporal and permanent hardness. In this chemical reaction, the calcium and magnesium ions react with sodium to form a precipitate.