Tag: ionic equilibrium

Quizzes (3) Questions (39)

Questions Related to ionic equilibrium

Multiple choice chemistry ionic equilibrium introduction to ionic equilibria in solution ionic equilibrium in solution ionisation of weak acids and weak bases

Which of the following is an example of weak electrolyte?

  1. $H _3BO _3$
  2. $H _2SO _4$
  3. $HNO _3$
  4. $HClO _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Boric acid is very weak acid since it dose not give $H^+$ , instead it takes $OH^-$ from $H _2O$ and become $B{ \left( OH \right)  } _{ 4 }^{ - }$ and Proton is lost from $H _2O$ not from boric acid.

Multiple choice chemistry ionic equilibrium introduction to ionic equilibria in solution ionic equilibrium in solution ionisation of weak acids and weak bases

The polymer containing strong intermolecular forces, i.e. hydrogen bonding, is

  1. $\text{Teflon}$
  2. $\text{Nylon-6,6}$
  3. $\text{Polystyrene}$
  4. $\text{Natural rubber}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nylon 6,6 has strong intermolecular forces like hydrogen bonding.The substantial strength of polyamides such as nylon 6,6 and Kevlar results from hydrogen bond.

Multiple choice chemistry ionic equilibrium introduction to ionic equilibria in solution ionic equilibrium in solution ionisation of weak acids and weak bases

Degree of ionisation does not depend on:

  1. nature of the solvent

  2. nature of the electrolyte

  3. dilution

  4. molecular mass of the electrolyte
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Degree of ionization $(\alpha)$ depends on-

1) Concentration of solute
2) Temperature
3) Nature of electrolysis
4) Nature of solvent
5) Dilution
"$\alpha$" does not depend on molecular mass of electrolyte.

Multiple choice chemistry ionic equilibrium introduction to ionic equilibria in solution ionic equilibrium in solution ionisation of weak acids and weak bases

The value of observed and calculate molecular weights of silver nitrate are $92.64$ and $170$ respectively. 


The degree of dissociation of silver nitrate will be :

  1. $60\%$
  2. $83.5\%$
  3. $85.3\%$
  4. $41.6\%$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The degree of dissociation alpha is calculated by (normal molar mass - observed molar mass) / (observed molar mass * (n-1)). For AgNO3, n=2. (170-92.64) / (92.64 * 1) = 77.36 / 92.64 = 0.835, which is 83.5%.

Multiple choice chemistry ionic equilibrium introduction to ionic equilibria in solution ionic equilibrium in solution ionisation of weak acids and weak bases

 Protolysis is transfer of:

  1. Hydroxide ions

  2. Water molecules

  3. Anions

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

protolysis (proton-transfer) reaction that takes place with very weak protonic acids, including water.


Protolysis $\to$ Transfer of $H^{+}$ ion and breaking of bonds by it.

Option D is correct.

Multiple choice chemistry ionic equilibrium introduction to ionic equilibria in solution ionic equilibrium in solution ionisation of weak acids and weak bases

Pure $PCl _5(g)$ was placed in a flask at $2\,atm$ and left for some time at a cretain temp. Where the following equilibrium was established $PCl _5(g) \rightleftharpoons PCl _3(g)+Cl _2(g)$
Under the given condition,pure oxygen was found to effuse $2.084$ time faster than the equilibrium mixture then $K _p$ of the above reaction is:

  1. $\dfrac{2}{3}$
  2. $\dfrac{3}{2}$
  3. $\dfrac{4}{5}$
  4. $\dfrac{5}{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using Graham's Law of Effusion, the ratio of molar masses is the square of the ratio of rates. M_mix = M_O2 / (2.084)^2 = 32 / 4.34 = 7.37. Using the equilibrium table, the total moles at equilibrium relate to Kp.