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 study of compounds a. hydrogen chloride laboratory method of preparation of hydrochloric acid physical and chemical properties and uses of hydrochloric acid hydrogen chloride: occurrence, preparation, purification and identification

Drying agents used in the purification of hydrogen chloride is/are:

  1. conc. $H _2SO _4$
  2. $P _2O _5$
  3. $CaO$

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

Conc. $H _2SO _4$ is a very strong drying agent and it is used in purification of hydrogen chloride.

Multiple choice chemistry study of compounds a. hydrogen chloride laboratory method of preparation of hydrochloric acid physical and chemical properties and uses of hydrochloric acid hydrogen chloride: occurrence, preparation, purification and identification

Glaber prepared $HCl$ from which of the following compounds?

  1. $NaCl,H _2SO _4$
  2. $NaCl,H _2CO _3$
  3. $NaCl,HNO _3$
  4. $KCl,H _2SO _4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glaber is the scientist who prepared hydrogen chloride in the laboratory by reacting sodium chloride with concentrated sulphuric acid.

$NaCl+H _2SO _4\rightarrow NaHSO _4+HCl$

Sodium bisulphate is a by-product in the above reaction . This is insoluble. Therefore, we further add it with more sodium chloride. This mixture has to be heated to a higher temperature of around 823K. It gives dissolvable sodium sulfate and HCl gas.

$NaHSO _4+NaCl\rightarrow Na _2SO _4+HCl$.

Hence option $A$ is correct.

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

When carbon dioxide is passed through lime water, it turns milky due to the formation of

  1. calcium hydroxide

  2. calcium carbonate

  3. calcium oxide

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

$Ca{ (OH) } _{ 2 }+C{ O } _{ 2 }\rightarrow CaC{ O } _{ 3 }+{ H } _{ 2 }O$

When carbon dioxide is passed through lime water, it turns milky due to formation of white precipitate in form of calcium carbonate.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

Which of the following would expand more on heating?

  1. Carbon dioxide

  2. Hydrogen peroxide

  3. Calcium hydroxide

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

In room temperature, carbon dioxide is gas, hydrogen peroxide is liquid, calcium hydroxide is solid and calcium carbonate is solid.

Gases expand more because of large intermolecular distance and weak intermolecular force.

Multiple choice chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

Select the correct statement out of the following.

  1. calcium fluoride is soluble in water.

  2. barium sulfate is soluble in water.

  3. barium dioxide is soluble in water.

  4. magnesium sulfate is soluble in water.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnesium sulfate is highly soluble in water (Epsom salt). Calcium fluoride and barium sulfate are notoriously insoluble in water.

Multiple choice chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

Dehydration of hydrates of halides of calcium, barium and strontium i.e., $CaCl _2.6H _2O,BaCl _2.2H _2O,SrCl _2.2H _2O$ can be achieved by heating. These become wet on keeping in the air. Which of the following statements is correct about these halides?

  1. The act as dehydrating agents.

  2. They can absorb moisture from air.

  3. They have tendency to from hydrate which decreases from calcium to barium.

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

Halides of calcium, barium and strontium act as dehydrating agent as they are hygroscopic in nature. They absorb moisture. Also they have tendency to form hydrate which decreases from $Ca^{2+}$ to $Sr^{2+}$ due to increase in size and decrease in polarization power.

Multiple choice biology garbage in, garbage out recycling of paper ways to reduce non degradable garbage recycling plastic waste thermocol reduce, recycle, reuse

Which of the following is used for deinking of papers?

  1. Surfactant

  2. Oxygen

  3. Carbon chloride

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Deinking is a very critical step in the manufacturing of paper or board from recycled paper or board. In this process, printing ink, dirt, and specks are removed from the fibres. It is done with a combination of mechanical action and chemicals added into the pulper and at flotation which involves the use of surfactants to ensure the detachment of ink from the fibres.
Generally, the amount of surfactant used is about 0.025-0.25%
So, the correct answer is option A.
Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

Which of the following is used as SI prefixes:

  1. Micro

  2. Mica

  3. Mikro

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

Micro is a prefix used in defining some units.  Whenever the word micro is attached as a prefix to an SI unit,  it means it is one million times smaller than that unit. For example, 1 micrometre is one millionth part of a metre. Rest all other options are not   prefixes 

Multiple choice chemistry substances in common use percent composition water of crystallisation percentage composition and empirical formula

A salt associated with water of crystallization is known as a:

  1. acid

  2. buffer

  3. hydrate

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

A salt associated with the water of crystallization is known as a hydrate. The structure of hydrates can be quite elaborate, because of the existence of hydrogen bonds that define polymeric structures.


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

Multiple choice chemistry substances in common use percent composition water of crystallisation percentage composition and empirical formula

Heated calcium sulphate with half a water of crystallization is commonly called as :

  1. washing soda

  2. plaster of paris

  3. naushadar salt

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

Plaster of paris which is chemically called calcium sulphate hemihydrate. Since, it is brought to use from paris, called as "plaster of paris". It is prepared by heating of gypsum at 373K. 

Multiple choice chemistry substances in common use percent composition water of crystallisation percentage composition and empirical formula

Since there are 10 water molecules in washing soda, hence it is known as:

  1. sodium bicarbonate decahydrate

  2. sodium carbonate decahydrate

  3. sodium bicarbonate nanohydrate

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

Washing soda is called sodium carbonate. Since, there are $10$ water molecules in washing soda, hence it is known as sodium carbonate decahydrate.