Tag: properties of acids and bases

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Questions Related to properties of acids and bases

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 least basic?

  1. <div class="question-option"><label></label><h2 class="question-option-name"><span class="MathJax"><span class="math"><span class="mrow"><span class="mi">N<span class="msubsup"><span class="mi">F<span class="mn">3<span class="MJX_Assistive_MathML">N</h2>

  2. <h2 class="question-option-name"><span class="MathJax"><span class="math"><span class="mrow"><span class="mi">N<span class="msubsup"><span class="mi">H<span class="mn">3</h2>

  3. <h2 class="question-option-name"><span class="MathJax"><span class="math"><span class="mi">N<span class="mi">C<span class="mrow"><span class="mi"><span class="msubsup"><span class="mi">l<span class="mn">3</h2>

  4. <h2 class="question-option-name"><span class="MathJax"><span class="math">N<span class="mrow"><span class="mi"><span class="msubsup"><span class="mi">I<span class="mn">3</h2>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

NF3 is the least basic among the nitrogen trihalides because the highly electronegative fluorine atoms pull electron density away from the nitrogen atom, making the lone pair less available for donation.

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

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

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

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

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

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

$H _2O _2$ is a:

  1. monobasic acid

  2. dibasic acid

  3. neutral compound

  4. weal alkali
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

$H _2O _2\rightarrow HO _2^−+H^+$

$HO _2^−\rightarrow O _2^{−2}+H^+$


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

Multiple choice action of alkalis on some metals and metal oxides analytical chemistry properties of acids and bases acids, bases and salts chemistry

Which of the following equation is the correct one?

  1. Amphoteric oxide / Hydroxide + acid$\rightarrow$ Salt + Hydrogen
  2. Amphoteric oxide / Hydroxide + alkali$\rightarrow$ Salt + Hydrogen
  3. Metal + alkali$\rightarrow$ Salt + Water
  4. Metal + alkali$\rightarrow$ Salt + Hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Amphoteric oxide reacts with acid/alkali to produce salt and water not salt and hydrogen. Also, Metal and alkali react to give salt and liberate hydrogen not water. So, option D is correct.

Multiple choice action of alkalis on some metals and metal oxides analytical chemistry properties of acids and bases acids, bases and salts chemistry

When aluminium hydroxide is reacted with excess sodium hydroxide, the soluble amphoteric compound is formed. Mark the correct formula. 

  1. $\displaystyle { \left[ { Al\left( OH \right) } _{ 4 } \right] }^{ - }$
  2. $\displaystyle { \left[ { Al\left( OH \right) } _{ 5 } \right] }^{ 2- }$
  3. $\displaystyle { \left[ { Al\left( OH \right) } _{ 6 } \right] }^{ 3- }$
  4. $\displaystyle { \left[ { Al\left( OH \right) } _{ 7 } \right] }^{ 4- }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Al(OH) _3 + NaOH \rightarrow Na^+ [Al(OH) _4]^-$

 Aluminium hydroxide when reacted with excess sodium hydroxide, the soluble amphoteric compound  formed is sodium tetra hydroxoaluminate (III).

Multiple choice action of alkalis on some metals and metal oxides analytical chemistry properties of acids and bases acids, bases and salts chemistry

When aluminium hydroxide is reacted with excess ammonium hydroxide, the insoluble compound is formed. Mark the correct formula.

  1. $\displaystyle { \left[ { Al\left( OH \right) } _{ 4 } \right] }^{ 1- }$
  2. $\displaystyle { \left[ { Al\left( OH \right) } _{ 5 } \right] }^{ 2- }$
  3. $\displaystyle { \left[ { Al\left( OH \right) } _{ 6 } \right] }^{ 3- }$
  4. $\displaystyle { \left[ { Al\left( OH \right) } _{ 7 } \right] }^{ 4- }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminium hydroxide reacts with excess hydroxide ions to form the soluble tetrahydroxoaluminate complex, [Al(OH)4]-. However, in some contexts, the hexahydroxoaluminate complex [Al(OH)6]3- is also discussed in coordination chemistry.

Multiple choice action of alkalis on some metals and metal oxides analytical chemistry properties of acids and bases acids, bases and salts chemistry

If the pH of an alkali metal hydroxide is 13.6, the concentration of hydroxide is ;

  1. More than 1 M

  2. Between 0.1 M and 1 M

  3. Between 0.01 M and 1 M

  4. Less than 0.001 M
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Given that :

$pH = 13.6$

Thus, $pOH = 14 - 13.6$

                     $=0.4$
Hence,
$[O{H^ - }] = lo{g^{ - 1}}( - 0.4)$

               $ = 0.3979$

Therefore the value of $[O{H^ - }]$ is between $0.1M$ and $1M$.

Therefore, the option is B.

Multiple choice action of alkalis on some metals and metal oxides analytical chemistry properties of acids and bases acids, bases and salts chemistry

A salt contains two atoms of iron, three atoms of sulphur and twelve atoms of oxygen. Identify the corresponding acid and base from which it is formed.

  1. $H _2 SO _4, Fe (OH) _2$
  2. $H _2 SO _3, Fe (OH) _2$
  3. $H _2 SO _3, Fe (OH) _3$
  4. $H _2 SO _4, Fe (OH) _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Fe _{2}(SO _{4}) _{3}$ is the salt formed from $Fe(OH) _{3}$ and $H _{2}SO _{4}$. The balanced chemical equation can be written as:
$2Fe(OH) _{3} + 3H _{2}SO _{4} \rightarrow Fe _{2}(SO _{4}) _{3} +6H _{2}O$