Tag: salts

Questions Related to salts

In the reaction, $BaCl _{2}(aq)+K _{2}SO _{4}(aq)\rightarrow BaSO _4(s)+2KCl(aq)$, which is not a spectator ion?

salts salts and their classification acids, bases and salts chemistry

  1. $K^{+}$

  2. $Cl^{-}$

  3. $Ba^{2+}$ and $SO _{4}^{-2}$

  4. Both $A$ and $B$

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Correct Option: C
Explanation:

Ions that are not involved in the formation of insoluble solid are called as spectator ions.


Therefore, $Ba^{2+}$ and $SO _{4}^{2-}$ ions form insoluble solid.

Hence they are not spectator ions.


Option C is correct.

We can obtain zinc sulphate from an active metal.

salts salts and their classification acids, bases and salts chemistry

  1. True

  2. False

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Correct Option: A
Explanation:

$Zn+{ H } _{ 2 }{ SO } _{ 4 }(dil.)\rightarrow { ZnSO } _{ 4 }+{ H } _{ 2 }$

Which of the following methods is generally used for preparing $Zn(NO _3) _2$ salt?


1 : Neutralisation - insoluble base & dilute acid  
2 : Neutralisation - alkali & dilute acid      

3 : Simple displacement - active metal & dilute acid  
4 : Direct combination                     

5 : Precipitation [double decomposition]

salts salts and their classification acids, bases and salts chemistry

  1. 2

  2. 3

  3. 4

  4. 5

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Correct Option: B
Explanation:

Zinc metal with dilute nitric acid gives zinc nitrate.

So, simple displacement-active metal & dilute acid is the correct option for this.

$Zn+2HNO _3 \rightarrow Zn(NO _3) _2+H _2$

Hence, the correct option is $(B)$.

State which of the following methods is generally used for preparing the $FeS$ salts
1: Neutralisation-insoluble base & dilute acid.
2: Neutralisation-alkali & dilute acid.
3: Simple displacement-active metal & dilute acid.
4: Direct combination.
5: Precipitation [double decomposition].
salts salts and their classification acids, bases and salts chemistry

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: D
Explanation:


Iron(II) sulfide is obtained by heating of iron and sulfur which is a direct combination.
$Fe+S \longrightarrow FeS$


Hence, the correct option is $(D)$

State which of the following methods is generally used for preparing the $Cu(NO _3) _2$ salts.
1: Neutralisation-insoluble base & dilute acid.
2: Neutralisation-alkali & dilute acid.
3: Simple displacement-active metal & dilute acid.
4: Direct combination.           
5: Precipitation [double decomposition].
salts salts and their classification acids, bases and salts chemistry

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: C
Explanation:

Copper reacts with nitric acid to form copper nitrate.


$3Cu+8HNO _3 \rightarrow 3Cu(NO _3) _2+4H _2O+2NO$

Hence, the correct option is simple displacement-active metal & dilute acid.  


Hence, the correct option is $(C)$

The best indicator for the detection of end point in titration of a weak acid and a strong base is :

salts salts and their classification acids, bases and salts chemistry

  1. methyl orange (3 to 4)

  2. methyl red (5 to 6)

  3. bromothymol blue (6 to 6.5)

  4. bromothymol blue (6 to 7.5)

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Correct Option: D
Explanation:

BTB is a pH indicator for reactions between weak acids and bases. It is mostly used in applications that require measuring substances that have a pH near 7. It can be protonated or deprotonated appearing yellow or blue. It is bluish green in neutral solution.

$Na _2O+2HCl\rightarrow \ ?$

salts salts and their classification acids, bases and salts chemistry

  1. $NaOH+H _2$

  2. $2NaCl+H _2O$

  3. $NaOH+Cl _2$

  4. $2NaCl+O _2$

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Correct Option: B
Explanation:

When any element who comes before hydrogen in the reactivity series reacts with a compound containing hydrogen, it displaces the hydrogen from the compound, since it's reactivity is more than that of hydrogen.

Here, $Na _2O$ is a basic metal oxide containing Na which is more reactive than the Hydrogen present in the acid $HCl$ and thus the Na replaces hydrogen from the acid, leading to the formation of salt and water.
Salt and water are formed because the reaction takes place between acidic and basic species.
$Na _2O+2HCl \rightarrow 2NaCl+H _2O$
Hence, the correct answer is option (B).

Complete the given reaction:

$CaCl _2+Na _2CO _3 \longrightarrow$

salts salts and their classification acids, bases and salts chemistry

  1. $CaCO _3+NaCl$

  2. $CaCO _3+2NaCl$

  3. $CaO+NaCl$

  4. none of the above

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Correct Option: B
Explanation:

Calcium chloride react with sodium carbonate to produce calcium carbonate and sodium chloride.
CaCl2 + Na2CO3 → CaCO3 + 2NaCl

Soluble salts can be prepared by addition of acid to :

salts salts and their classification acids, bases and salts chemistry

  1. active metals

  2. metallic oxides

  3. metallic carbonates

  4. all of the above

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Correct Option: D
Explanation:

Soluble salts can be prepared by the addition of acid to :

  1. Active metals
  2. Metallic oxides
  3. Metallic carbonates

Insoluble salts can be prepared by:

salts salts and their classification acids, bases and salts chemistry

  1. precipitation

  2. direct combination

  3. both $A$ and $B$

  4. none of the above

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Correct Option: C
Explanation:

The method used to prepare insoluble salts are either by precipitation or direct combination.