Tag: acids, bases and salts

Questions Related to acids, bases and salts

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. 

Which of the following does NOT form an acidic salt?

salts salts and their classification acids, bases and salts chemistry

  1. Phosphoric acid

  2. Carbonic acid

  3. Hydrochloric acid

  4. Sulphuric

Show answer
Correct Option: B

Lime water + sulphuric acid $\rightarrow$

salts salts and their classification acids, bases and salts chemistry

  1. Heat + Calcium sulphate

  2. Water + Heat

  3. Calcium sulphate + Water + Heat

  4. None of the above

Show answer
Correct Option: C
Explanation:

Lime water/calcium hydroxide $Ca(OH) _2$ is a strong base and sulphuric acid $H _2SO _4$ is a strong acid as they undergo complete dissociation in solution.

When acid and base react with each other, the base neutralizes the acid, leading to the formation of salt and water.
This reaction is known as neutralization reaction and it is exothermic in nature (since heat is released due to formation of new bonds in the reaction).
Thus, more stronger the acid and the base, more amount of heat is released.
$Ca(OH) _2 + H _2SO _4 \rightarrow CaSO _4+2H _2O + Heat$.
Hence, the correct answer is option (C).

Which technique produces a compound which is not soluble in water?

salts salts and their classification acids, bases and salts chemistry

  1. Conductivity

  2. Calorimetry

  3. Precipitation

  4. Spectrophotometry

Show answer
Correct Option: C
Explanation:

A reaction occurs when you mix two aqueous solutions. This is when you will find out whether a precipitate will form or not. A precipitate forms if the product of the reaction is insoluble in water.

Precipitation occurs when cations and anions in the aqueous solution combine to form an insoluble ionic solid called a precipitate.
Conductivity is the property to conduct electricity, calorimetry is the process of measuring the heat of chemical reactions and spectrophotometry is the measurement of reflection or transmission properties of the material as a function of wavelength.
Since precipitation produces a compound which is not soluble in water, the correct answer is the option (C).

When the aqueous solution of silver nitrate and sodium chloride are mixed, a________ precipitate is immediately formed.

salts salts and their classification acids, bases and salts chemistry

  1. yellow

  2. white

  3. red

  4. black

Show answer
Correct Option: B
Explanation:

When silver nitrate $(AgNO _3)$ reacts with sodium chloride $(NaCl)$ a white precipitate of silver chloride $(AgCl)$ is formed which is highly insoluble in water, along with formation of sodium nitrate $(NaNO _3)$.

Since $(AgCl)$ is insoluble in water it will precipitate out and $(NaNO _3)$ is soluble in water so it will remain dissolved in the mixture. This reaction is an example of double displacement reaction and it occurs as follows:-
$AgNO _3\ +\ NaCl \rightarrow AgCl\ +\ NaNO _3 $
Hence, the correct answer is the option (B).