Tag: acids, bases and salts

Questions Related to acids, bases and salts

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. $2NaCl+O _2$

Show answer
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.

Ashish mixed a solution of soluble silver nitrate and soluble sodium chloride. The products formed are :

salts salts and their classification acids, bases and salts chemistry

  1. soluble silver chloride and soluble sodium nitrate

  2. insoluble silver chloride and insoluble sodium nitrate

  3. insoluble silver chloride and soluble sodium nitrate

  4. soluble silver chloride and insoluble sodium nitrate

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Correct Option: C
Explanation:

To make an insoluble salt, it is possible to make two soluble salts react together in a precipitation reaction. Silver nitrate and sodium chloride are both soluble. When mixing their solutions together, the result is insoluble silver chloride and soluble sodium nitrate.

An insoluble salt can be made by mixing two solutions of soluble salts in a process is called :

salts salts and their classification acids, bases and salts chemistry

  1. neutralization

  2. precipitation

  3. ionization

  4. condensation

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Correct Option: B
Explanation:

An insoluble salt can be made by mixing two solutions of soluble salts in a process is called precipitation. Two solutions of soluble compounds can be used, each of which provides one of the two ions required to combine and precipitate out as the insoluble salt.

Sodium hydroxide reacts with nitric acid to give a soluble salt which is _________.

salts salts and their classification acids, bases and salts chemistry

  1. $NaNO$

  2. $NaNO _2$

  3. $NaNO _3$

  4. none of the above

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Correct Option: C
Explanation:

$  Sodium\ hydroxide + Nitric\ acid \rightarrow Sodium\ nitrate + Water  $
$  NaOH(aq) + HNO _3(aq)  \rightarrow  NaNO _3(aq) + 2H _2O(l)   $
Sodium nitrate thus formed is a soluble salt.
 

$  Zn + H _2SO _4 \rightarrow     $
What is the salt produced? What is the solubility of the salt?

salts salts and their classification acids, bases and salts chemistry

  1. $ZnSO _4$, soluble

  2. $ZnSO _4$, insoluble

  3. $ZnSO _2$, soluble

  4. $ZnSO$, insoluble

Show answer
Correct Option: A
Explanation:

Reacting an acid with a metal or with an insoluble base gives a soluble salt. 
$  Zn + H _2SO _4 \rightarrow        ZnSO _4     +  H _2  $