Tag: reactions of acids and bases

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

Which of the following is used for dissolution of gold ? 

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. Aqua regia
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the following acid is used in fire extinguishers?

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. Oxalic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Acetic acid

  2. Phosphoric acid

  3. Oxalic acid

  4. Sulphuric acid
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The acid generally stored in batteries is :

  1. sulphuric acid

  2. nitric acid

  3. hydrochloric acid

  4. acetic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Soda-acid fire extinguisher extinguishes the fire by :

  1. cutting the supply of air

  2. removing the combustible substance

  3. raising the ignition temperature

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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

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

  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. $CaCl _{2} + 2H _{2}O + 4CO _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.