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Acids and bases - class-XI

Description: acids and bases
Number of Questions: 15
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Tags: acids, bases and salts chemistry acids and bases
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Ist & IInd dissociation const. for oxalic acid is $K _{1}$  and $K _{2}$  which is right statement is : 

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

  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

Show answer
Correct Option: C

The main constituent of bio-gas is:-

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

  1. $ CH _4 $

  2. $ CO _2 $

  3. $ H _2 S $

  4. $ H _2 $

Show answer
Correct Option: A

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

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

  1. hydrogen

  2. chlorine

  3. carbon monoxide

  4. carbon dioxide

Show answer
Correct Option: D
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).

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

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

  1. salt and water

  2. water and heat

  3. water and gas

  4. salt and gas

Show answer
Correct Option: A

Acids liberate sulphur dioxide with metallic sulphides.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Acids liberate sulphur dioxide or hydrogen sulphide on reaction with metallic sulphides.

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

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

  1. ${ CO } _{ 2 }$

  2. ${ O } _{ 2 }$

  3. CO

  4. ${ NO } _{ 2 }$

Show answer
Correct Option: A
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. ${ CaCO } _{ 3 }+HCl\rightarrow { CaCl } _{ 2 }+{ H } _{ 2 }O+{ CO } _{ 2 }$

Metal carbonates and hydrogen carbonates react with acids to give :

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

  1. carbon dioxide gas

  2. hydrogen gas

  3. sulphur dioxide gas

  4. carbon monoxide gas

Show answer
Correct Option: A
Explanation:

Carbonates contain carboxylate ion which reacts with mineral acids to form carbon dioxide gas which gets evolved from the reaction mixture.

The strongest base among the following is:

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

  1. $CH^{-} _{3}$

  2. $F^{-}$

  3. $NH^{-} _{2}$

  4. $OH^{-}$

Show answer
Correct Option: A
Explanation:

${CH _3}^-$ is an extremely strong base because it is the conjugate base of weak acid $CH _4$.

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

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

  1. Increases

  2. Decreases

  3. Remains constant

  4. Can't be predicted

Show answer
Correct Option: C
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 $KHSO _4$ .

The weakest Lewis base ?

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

  1. $ H^- $

  2. $OH^- $

  3. $ CI^- $

  4. $ HCO _3^- $

Show answer
Correct Option: C
Explanation:

Lewis base is a compound that should donate electrons easily.

The weakest Lewis base is $Cl^{\circleddash}$, because it has octet rule. $Cl^{\circleddash}$ won't donate electrons easily.

Which of the following is least basic?

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

  1. NF3N

  2. NH3

  3. NCl3

  4. NI3

Show answer
Correct Option: A

In which case of mixing a strong acid and a base each of $1$N concentration, temperature rise is highest?

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

  1. $20$ ml, acid + $30$ ml alkali

  2. $10$ ml, acid + $40$ ml alkali

  3. $20$ ml, acid + $20$ ml alkali

  4. $30$ ml, acid + $20$ ml alkali

Show answer
Correct Option: C
Explanation:

More amount of acid reacts with equal amount of base, higher the amount of heat releases.

So, $20ml$ of acid+$20ml$ of alkali.

Conjugate base of ${ H } _{ 3 }{ PO } _{ 4 }$?

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

  1. ${ H } _{ 2 }{ PO } _{ 4 }^{ - }$

  2. ${ H } _{ }{ PO } _{ 4 }^{ 2- }$

  3. ${ H } _{ 4 }{ PO } _{ 4 }^{ + }$

  4. ${ H } _{ 3 }{ PO } _{ 4 }^{ }$

Show answer
Correct Option: A
Explanation:

${H _2PO _4}^-$ is conjugate base of $H _3PO _4$  .

$H _2O _2$ is a:

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

  1. monobasic acid

  2. dibasic acid

  3. neutral compound

  4. weal alkali

Show answer
Correct Option: B
Explanation:
A dibasic molecule has two replaceable hydrogen atoms. Since $H _2O _2$ has two replaceable hydrogen atoms, That's why it is a dibasic acid.

$H _2O _2\rightarrow HO _2^−+H^+$

$HO _2^−\rightarrow O _2^{−2}+H^+$


$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (B)}$

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