Tag: compounds of carbon

Questions Related to compounds of carbon

Which of the following is used as fire extinguisher ?

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

  1. Sodium carbonate

  2. Sodium bicarbonate

  3. Sodium chloride

  4. Ammonium chloride

Show answer
Correct Option: B
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.

With reference to sodium bicarbonate which statement is true from the options.

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

  1. Statement 1: Sodium bicarbonate ($NaHCO _3$)

  2. Statement 2: It reduces stomach acid  

  3. Statement 3: It is used to relieve heartburn, sour stomach, or acid  

  4. All are true 

Show answer
Correct Option: D
Explanation:

These are the right properties of Sodium Bicarbonate

Sodium bicarbonate ($NaHCO _3$)
It reduces stomach acid 

It is used to relieve heartburn, sour stomach, or acid   

Soda acid for extinguisher contains:

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

  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

Show answer
Correct Option: B
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.
$2NaHCO _3+H _2SO _4 \rightarrow Na _2SO _4+2H _2O+2CO _2$

 Select the correct choice:

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

  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.

Show answer
Correct Option: A
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


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

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

  1. $NaH _{2}PO _{2}$

  2. $Na _{2}HPO _{3}$

  3. $Na _{2}HPO _{4}$

  4. all of these

Show answer
Correct Option: B
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.

Sodium bicarbonate can react with:

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

  1. $Na _{2}CO _{3}$

  2. $NaOH$

  3. $NaH$

  4. $HCl$

Show answer
Correct Option: D
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)

Slaked lime reacts with chlorine to give:

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

  1. $CaCl _2$

  2. $CaO$

  3. $Ca(OCl) _2$

  4. $CaCO _3$

Show answer
Correct Option: C
Explanation:

Slaked lime reacts with chlorine to give bleaching powder.


$Ca(OH) _2  + Cl _2 \rightarrow CaOCl _2 + H _2O$

The solution of bleaching powder in water is always a clear solution.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Bleaching powder is known as calcium hypochlorite. It is marketed as bleach powder. It is white solid although commercial samples appear yellow. It is not highly soluble in water and is used in soft to medium hard water. It has two forms dry and hydrated.

The molecular formula of Baking soda is:

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

  1. $NaHCO _3$

  2. $NaHCO _3.6H _2O$

  3. $Na _2CO _3$

  4. $Na _2CO _3.10H _2O$

Show answer
Correct Option: A
Explanation:

Baking soda is commonly known as sodium bicarbonate $ NaHC{ O } _{ 3 } $ used for cooking purposes.

Bleaching powder is effective with cold water, but ineffective with hot water. This is because of:

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

  1. oxidation of chloride radical

  2. reduction of chloride radical

  3. reduction of hypochlorite radical

  4. hydrolysis of hypochlorite radical

Show answer
Correct Option: C
Explanation:

Bleaching action takes place due to the hypochlorite radical [$ClO^{-}$].

But when used in hot water, hot water favours reduction of the hypochlorite radical as a result of which bleaching powder is ineffective with hot water.
Generally, Bleaching powder is used as a disinfectant widely.