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 allotropy of carbon preparation, properties and uses of baking soda chemical from common salt compounds of carbon

Soda acid for extinguisher contains:

  1. sodium carbonate and nitric acid

  2. sodium hydrogen carbonate and sulphuric acid

  3. sodium carbonate and carbonic acid

  4. sodium chloride and sulphuric acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Soda acid for extinguisher contains sodium hydrogen carbonate and sulphuric acid. The reaction between sodium bicarbonate solution and sulfuric acid expels pressurized water onto a fire.
$2NaHCO _3+H _2SO _4 \rightarrow Na _2SO _4+2H _2O+2CO _2$

Multiple choice chemistry allotropy of carbon preparation, properties and uses of baking soda chemical from common salt compounds of carbon

 Select the correct choice:

  1. $KHCO _3$ is less soluble in water than $NaHCO _3$.
  2. $CaC _2O _4$ is soluble in water and alkalies.
  3. $Ca(HCO _3) _2$ an obtained in solid state.
  4. $BeF _2$ is water soluble but $CaF _2$ is water insoluble.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
using Fazan's rule we can say that $KHCO _3$ is less soluble in water than $NaHCO _3$

Calcium oxalate is an ionic compound with the chemical formula $CaC _2O _4$ and a salt of oxalic acid. It's highly insoluble and dissolves poorly in water. One method for dissolving calcium oxalate in the lab is the application of a compound called ethylenediaminetetraacetic acid or EDTA. EDTA is highly effective at binding the calcium ions and thereby decreasing the concentration of calcium in solution, shifting the reaction equilibrium so that more calcium oxalate will dissolve.

$NaHCO _3$ is stable to heat and normal temperature hence isolated as a solid.

However, $Ca(HCO _3) _2$ is not stable at these temperatures and hence is isolated from water, also bicarbonates of alkaline earth metals are reactive with atmospheric $CO _2$ leading to formation of  $CaCO _3$.


Hydration energy decreases down the group ,so solubility decreases down the group


Multiple choice chemistry allotropy of carbon preparation, properties and uses of baking soda chemical from common salt compounds of carbon

Which salt can furnish $H^{+}$ in its aqueous solution?

  1. $NaH _{2}PO _{2}$
  2. $Na _{2}HPO _{3}$
  3. $Na _{2}HPO _{4}$

  4. all of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • Disodium hydrogenphosphite$ ( Na _2HPO _3)$ is a salt of phosphorus acid $( H _3PO _3)$, which is a dibasic acid. A dibasic acid has only two acidic or replaceable hydrogen atoms in its molecule. In $( H _3PO _3)$, the third hydrogen is directly bonded to phosphorus and so it is non-acidic.
  • $  Na _2HPO _3$ is formed when the two acidic hydrogens are replaced by sodium. In other words, this salt is the product of complete neutralisation of phosphoric acid by sodium hydroxide. It does not have any acidic hydrogen. So, it can furnish any $H^+$ in its aqueous solution.

Multiple choice chemistry allotropy of carbon preparation, properties and uses of baking soda chemical from common salt compounds of carbon

Sodium bicarbonate can react with:

  1. $Na _{2}CO _{3}$
  2. $NaOH$
  3. $NaH$
  4. $HCl$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium bicarbonate mixed with water can be used as an antacid to treat acid indigestion and heartburn. Its reaction with stomach acid produces salt, water, and carbon dioxide: 

${ NaHCO } _{ 3 }$ + $HCl$ $\rightarrow$ $NaCl$ + ${ H } _{ 2 }O$ + ${ CO } _{ 2 }$(g)

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which selection would be used to purify solid $NaCl$ from an aqueous solution of $NaCl$?

  1. Crucible

  2. Evaporating

  3. Tongs

  4. Erlenmeyer flask

  5. Mortar and pestle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Evaporating dish $\rightarrow$
It is used to evaporate excess solvents (most commonly water) to produce a concentrated solution or a solid precipitate of the dissolved substance. 
Hence it can be used to purify solid $NaCl$ from an aqueous solution of $NaCl$.
Hence the required answer is (B) Evaporating dish.
Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

For which of the following solution we use glass rod to mix them in the chemistry laboratory.

  1. $H _2O$ and $CCl _4$
  2. $H _2O$ and $C _2H _5OH$
  3. $NaCl$ and $H _2O$

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

All the given pair of  compounds are miscible and are soluble in each other. Hence, we can use a glass rod to mix them in the chemistry laboratory. 

Multiple choice chemistry composition of matter classification of mixtures mixtures: examples and properties types of solutions

Which pair of the following substances is said to be isomorphous?

  1. White vitriol and blue vitriol

  2. Epsom salt and Glauber salt

  3. Blue vitriol and Glauber salt

  4. White vitriol and epsom salt
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

White vitriol and blue vitriol are known as isomorphous because they have similar chemical formula and closely similar in shape.

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

The reaction of $NaCl$ and $CaCO _3$ gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reaction of $NaCl$ and $CaCO _3$ gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction.

$2NaCl+CaCO _3\rightleftharpoons Na _2CO _3+CaCl _2$.

Hence the given statement is True.

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

Slaked lime and chlorine reacts to produce :

  1. quick lime
  2. $CaCl _2$
  3. $CaOCl _2$
  4. mixture of $CaCl _2$ and $Ca(OCl _2)$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Ca(OH) _2+\underset{\text{dry}}{Cl _2}\xrightarrow{below\,35^oC} \underset{\text{Bleaching powder}}{CaOCl _2 + H _2O}$


$2Ca(OH) _2 + 2Cl _2\xrightarrow{red\, heat} 2CaCl _2 + 2H _2O + O _2\uparrow$

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

Which one of the following is a correct statement?

  1. Bleaching powder is a compound

  2. Bleaching powder is mixture of calcium chloride and calcium hypochloride

  3. Bleaching powder is a mixture of calcium chloride,calcium hypochlorite and slaked lime

  4. Bleaching powder is a mixture of sodium chloride and sodium hypochloride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Calcium hypochlorite is an inorganic compound with formula $Ca(ClO) _2$. As a mixture with lime and calcium chloride, it is marketed as chlorine powder or bleach powder for water treatment and as a bleaching agent.