Tag: reactions of acids and bases

Questions Related to reactions of acids and bases

Which of the following equation represents action of alkali on metal?

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. $Zn+2NaOH\rightarrow Na _2ZnO _2+H _2$

  2. $Zn+2KOH\rightarrow K _2ZnO _2+H _2$

  3. $Pb+2KOH\rightarrow K _2PbO _2+H _2$

  4. All of the above

Show answer
Correct Option: D
Explanation:

Alkali reacts with hot concentrated caustic alkalies to give corresponding soluble salt and liberate hydrogen.

Which of the following equation is correct for action of alkali on aluminium?

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. $2Al+2NaOH+2H _2O\rightarrow2NaAlO _2+3H _2$

  2. $2Al+2KOH+2H _2O\rightarrow2KAlO _2+3H _2$

  3. $Al+NaOH+H _2O\rightarrow NaAlO _2+H _2$

  4. Both A and B

Show answer
Correct Option: D
Explanation:

$2Al+2NaOH+2H _2O\rightarrow2NaAlO _2+3H _2$ and $2Al+2KOH+2H _2O\rightarrow2KAlO _2+3H _2$ 

Complete the following equation
$Pb+NaOH\rightarrow$

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. $Pb+2NaOH\rightarrow Na _2PbO _2+H _2$

  2. $Pb+NaOH\rightarrow2Na _2PbO _2+H _2$

  3. $Pb+NaOH\rightarrow Na _2PbO _2+H _2$

  4. $Pb+2NaOH\rightarrow2Na _2PbO _2+H _2$

Show answer
Correct Option: A
Explanation:

$Pb+2NaOH\rightarrow Na _2PbO _2+H _2$ 

Which of the following is used for dissolution of gold ? 

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. Aqua regia

Show answer
Correct Option: D
Explanation:

Gold,palladium,gallium are all noble metals which are dissolved in aqua regia. It is also known as royal water which is a mixture of hydrochloric acid and nitric acid in the ratio of 3:1 respectively.

Which of the following acid is used in fire extinguishers?

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. Oxalic acid

Show answer
Correct Option: B
Explanation:

Sulphuric acid is non flammable so soda acid is most common fire extinguisher. Carbon dioxide is liberated by the action of sulphuric acid on baking soda or sodium bicarbonate. This increases the percentage of carbon dioxide in air. Due to this the supply of air is cut off and fire is extinguished.

Which of  the following acids is called the king of the acids?

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. Acetic acid

  2. Phosphoric acid

  3. Oxalic acid

  4. Sulphuric acid

Show answer
Correct Option: D
Explanation:

Sulphuric acid is diprotic acid and shows different properties depending upon its concentration. It is a strong acid and in concentrated form it has strong dehydrating and oxidising properties. It has large number of applications. In almost all industrial processes sulphuric acid is used,in production of lead acid batteries,production of fertilizers,in chemistry labs,petroleum refining and production of paper. So it is called as the king of all acids.

The acid generally stored in batteries is :

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. sulphuric acid

  2. nitric acid

  3. hydrochloric acid

  4. acetic acid

Show answer
Correct Option: A
Explanation:

Sulphuric acid develops voltage from the chemical reaction produced when two unlike materials such as the positive and negative plates are immersed in the electrolyte a solution of sulphuric acid and water. In typical lead-acid battery the voltage is approx. 2 volts per cell for a total of 12 volts.

Soda-acid fire extinguisher extinguishes the fire by :

reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

  1. cutting the supply of air

  2. removing the combustible substance

  3. raising the ignition temperature

  4. none of these

Show answer
Correct Option: A
Explanation:
The principle of working of fire extinguisher is based on either of the following three conditions: 
• cooling the combustible material below its ignition temperature, or 
• cutting off the supply of air, or 
• cooling the combustible material and at the same time cutting the supply of air. 

When marble chips are treated with $HCl $, which of the following gas is liberated?

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. CO$ _2$

  2. O$ _2$

  3. CO

  4. NO$ _2$

Show answer
Correct Option: A
Explanation:

Reaction:

$\underbrace{CaCO _3} _{(Marble\quad chips)} +2HCl\longrightarrow CaCl _2+CO _2(g) +H _2O(l)$
So, $CO _2$ gas is liberated.

$Ca(HCO _{3}) _{2} + 2HCl \rightarrow $

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. $CaCl _{2} + 2H _{2}O + 2CO _{2}$

  2. $2CaCl _{2} + 2H _{2}O + 2CO _{2}$

  3. $CaCl _{2} + 4H _{2}O + 2CO _{2}$

  4. $CaCl _{2} + 2H _{2}O + 4CO _{2}$

Show answer
Correct Option: A
Explanation:

$Ca(HCO _{3}) _{2} + 2HCl \rightarrow CaCl _{2} + 2H _{2}O + 2CO _{2}$ 

Metal carbonates react with  acids to give salt, carbon dioxide and water.