Tag: chemistry

Questions Related to chemistry

Baking powder contains :

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. $NaHCO _{3}, Ca(H _{2}PO _{2}) _{2}$ and starch

  2. $NaHCO _{3}, Ca(H _{2}PO _{2}) _{2}$

  3. $NaHCO _{3}$, starch

  4. $NaHCO _{3}$

Show answer
Correct Option: A
Explanation:

Baking powders contains sodium bicarbonate and one or more acid salts. Usually 30% sodium bicarbonate, 5-12% monocalcium phosphate, and 21-26% sodium aluminium sulfate and starch.

The baking soda formula is :

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

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

  2. $NaHCO _{3}$

  3. both a and b

  4. none of these

Show answer
Correct Option: B
Explanation:

Its chemical formula is $NaHCO _3$(sodium bicarbonate). Its formula consists of one sodium (Na) atom, one hydrogen (H) atom, one carbon (C) atom and three oxygen (O) atoms. It is commonly known as baking soda, bread soda, bicarbonate of soda, and cooking soda.

$\text{Statement}:$ Baking soda or baking powder is different.


Answer whether the above statement is true or false.

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
$\text {Baking soda}$ has only one ingredient: sodium bicarbonate. It's chemical formula is $NaHCO _3$ and dissolves into water in its ionic form: $Na^+$ and $HCO^{3-}$. Sodium bicarbonate is a base that reacts when it comes into contact with acids, like buttermilk, yogurt or vinegar. 

Baking powder has different ingredients that create $CO _2$ gas at different stages of the baking process. A typical formulation (by weight) could call for 30% sodium bicarbonate, 5–12% monocalcium phosphate, and 21–26% sodium aluminium sulphate.

Baking soda and Baking powder can be distinguished by the ingredients present as well as their reactivity towards acids.

Hence, the given statement is True.

The pair whose both species are used in antacid medicinal preparation is

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. $NaHCO _3$ and $Mg(OH) _2 $

  2. $Na _2CO _3$ and $Ca(HCO _3) _2 $

  3. $Ca(HCO _3) _2$ and $Mg(OH) _2 $

  4. $Ca(OH) _2$ and $NaHCO _3$

Show answer
Correct Option: A
Explanation:

Milk of magnesia is an aqueous suspension of magnesium hydroxide $[Mg(OH) _2]$ used to treat acid indigestion.
Also sodium bicarbonate is used for antacid medicinal preparation.

When we add a pinch of sodium hydrogen carbonate in a flask containing ethanoic acid a reaction takes place. What will be the observation when we carry out the reaction?

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. Milky solution

  2. Bubble formation

  3. Solution turns red

  4. Brisk effervescence

Show answer
Correct Option: D
Explanation:
Two main observations during the reaction are:
(i) Brisk effervescence
(ii) Sodium acetate is formed

Chemical equation for the reaction is:

$2CH _3COOH + 2NaHCO _3 \to 2CH _3COONa + 2CO _2 + 2H _2O$


Option D is correct.

'Sodium bicarbonate solution has $pH$ less than 7.'
State True or False:

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. True

  2. False

  3. Cannot be determined

  4. None of the above

Show answer
Correct Option: B
Explanation:

Sodium bicarbonate is amphoteric, reacting with acids and bases. It reacts violently with acids, releasing CO2 gas as a reaction product. Because of $NaHCO _3$ is a weak base the pH value should be greater than 7.

Reaction with sulfuric acid: 
$2 NaHCO _3 + H _2SO _4 \rightarrow Na _2SO _4 + 2 H _2O + 2 CO _2$ 

With sodium hydroxide: 
$NaHCO _3 + NaOH \rightarrow Na _2CO _3 + H _2O$

Hence, statement is false.

RCOOH decomposes $NaHCO 3$ to liberate $ CO _2$ which comes from_____:

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. $NaOHCO _{3}$

  2. $NaHCO _{3}$

  3. $NaHCO _{2}$

  4. $NaHCO$

Show answer
Correct Option: B
Explanation:

RCOOH decomposes $NaHCO _3$ to liberate $CO _2 $ which comes from $NaHCO _3$.
$NaHCO _3 + RCOOH \rightarrow RCOONa + H _2O + CO _2$

$NaHCO _3$ represent the formula of which one of the following? 

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. Sodium carbonate

  2. Baking soda

  3. Sodium acetate

  4. Washing soda

Show answer
Correct Option: B
Explanation:

${ NaHCO } _{ 3 }$ is sodium bicarbonate or known as sodium hydrogen carbonate. Sodium bicarbonate is a white solid that appears as fine powder. It has a slightly salty, alkaline taste resembling that of sodium carbonate(washing soda). It is also known as baking soda or cooking soda. 

The balanced equations for : "Carbon dioxide is passed through a concentrated aqueous solution of sodium chloride saturated with ammonia".

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. $NaCl + NH _4OH + CO _2\rightarrow NH _4Cl +NaHCO _3$

  2. $2NaCl + NH _4OH + CO _2\rightarrow NH _4Cl +2NaHCO _3$

  3. $NaCl + NH _4OH + CO _2\rightarrow NH _4CO +NaHCl _3$

  4. $NaCl + NH _4OH + CO _2\rightarrow NH _3 +NaCl+H _2CO _3$

Show answer
Correct Option: A
Explanation:

$NaCl + NH _4OH + CO _2\rightarrow NH _4Cl +NaHCO _3$ 

Sodium bicarbonate is formed. This reaction is used in the Solvay process for the manufacture of sodium carbonate.

A milkman adds a very small amount of baking soda to fresh milk. The pH will :

chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

  1. increase

  2. decrease

  3. same as milk

  4. none of these

Show answer
Correct Option: A
Explanation:

Baking soda is mild base, so when it is added to milk the pH of the milk slightly increases towords basic value.