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

Ist & IInd dissociation const. for oxalic acid is $K _{1}$  and $K _{2}$  which is right statement is : 

  1. $K _{2}$ ,$K _{1}$ are equal
  2. $K _{2}$ is 1000 times greater thean $K _{1}$
  3. $K _{2}$ is $\frac{1}{1000}$ time than $K _{1}$

  4. All correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxalic acid H2C2O4 is a diprotic acid. The first dissociation (H2C2O4 → HC2O4- + H+) is easier than the second (HC2O4- → C2O4²- + H+) because removing H+ from a negatively charged species (HC2O4-) is harder. K2 is typically 1/1000 of K1.

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

When a metal carbonate is treated with dilute hydrochloric acid, the gas liberated is:

  1. hydrogen

  2. chlorine

  3. carbon monoxide

  4. carbon dioxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When metal carbonate is treated with dilute hydrochloric acid, the products formed are salt, water and carbon dioxide.

This is a type of neutralization reaction but here an intermediate called as carbonic acid is formed $H _2CO _3$, but it gets split into salt, water and carbon dioxide $(CO _2)$, as the intermediate is unstable.
$CO _2$ gas that is produced causes effervescence or bubbling.
Thus, the correct answer is option (D).

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

The metal carbonate will form bubbles giving off carbon dioxide gas and the other products namely :

  1. salt and water

  2. water and heat

  3. water and gas

  4. salt and gas
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a metal carbonate reacts with an acid, it produces a salt, water, and carbon dioxide gas. The general equation is: Metal Carbonate + Acid -> Salt + Water + Carbon Dioxide.

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

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

  1. ${ CO } _{ 2 }$
  2. ${ O } _{ 2 }$

  3. CO
  4. ${ NO } _{ 2 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Marble chips are made up of by calcium carbonate. When they are treated with $HCl$, carbon dioxide gas is formed along with water and calcium chloride. ${ CaCO } _{ 3 }+HCl\rightarrow { CaCl } _{ 2 }+{ H } _{ 2 }O+{ CO } _{ 2 }$

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

When $KHSO _{4}$ is added to concentrated solution of $H _{2}SO _{4}$, the acidity of the solution ?

  1. Increases

  2. Decreases

  3. Remains constant

  4. Can't be predicted
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When $KHSO _4$ is added to concentrated $H _2SO _4$, the acidity remains constant.

Because $H _2SO _4$ is highly concentrated, it's acidity won't increase by adding $KHSO _4$ .