Tag: chemical equilibrium and acids-bases

Quizzes (7) Questions (149)

Questions Related to chemical equilibrium and acids-bases

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

An equilibrium expression may be forced to completion by:

  1. adding a catalyst

  2. increasing the pressure

  3. increasing the temperature

  4. removing the products from the reaction mixture as they are formed

  5. decreasing the reactant concentration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Le-chatelier principal reaction moves in forward direction if we remove products with time.so removing the products from the reaction mixture as they are formed may be forced to completion of an equilibrium expression.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

${N} _{2}(g)+3{H} _{2}(g)\rightleftharpoons 2{NH} _{3}(g)+heat$
For the reaction above, what is the effect on the equilibrium position when the pressure is decreased?

  1. Increased production of products

  2. Increased production of reactants

  3. Fluctuations in the amounts of reactants and products

  4. No impact on the equilibrium

  5. Cannot be determined
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The given reaction is :-

${ N } _{ 2 }\left( g \right) +3{ H } _{ 2 }\left( g \right) \rightleftharpoons 2{ NH } _{ 3 }\left( g \right) +heat$
In this equilibrium, the forward reaction is accompanied by decrease in total no. of moles of gaseous species. If pressure on the system is decreased, the equilibrium shifts to the direction in which no. of moles increases as per Le Chatelier's principle. So, the backward reaction is favoured and reactants production is increased.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

In a closed container rates of evaporation and condensation are same. What this statement indicate?

  1. A general rule for predicting solubility

  2. Conversion of solid phase to the liquid phase

  3. It represents relationship between absolute temperature and the kinetic energy of particles

  4. It represents relationship between volume and temperature at constant pressure

  5. A state in which the liquid and gas phases are in equilibrium
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Evaporation is the process of conversion from a liquid state to gaseous state.

Condensation is the process of conversion from the gaseous state to a liquid state. If a rate of the evaporation rate of condensation 
$\Rightarrow \quad $ Liquid & gas phases are in equilibrium.
This is the condition for physical equilibrium.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

Which of the following solutions show positive deviation from Raoult's law?

  1. Acetone + Ethanol

  2. Acetone + Benzene

  3. Water + Methanol

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Positive deviation from Raoult's law occurs when the solute-solvent interactions are weaker than the solute-solute and solvent-solvent interactions. All the listed pairs (Acetone+Ethanol, Acetone+Benzene, Water+Methanol) exhibit this behavior.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

Ideal solutions doesn't obey Roult's law.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ideal solutions obey Raoult's law. Raoult's law states that the partial vapour pressure of each component an Ideal solution is equal to the vapour pressure of the pure component at that temperature multiplied by its mole fraction.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

An increase in pressure will change the equilibrium by:

  1. shifting to the side where a smaller volume results

  2. shifting to the side where a larger volume results

  3. favoring the endothermic reaction

  4. favoring the exothermic reaction

  5. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An increase in pressure will change the equilibrium by shifting to the side from higher number of moles to lower number of moles. 

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

Which of the following is false of a binary solution showing false deviation from Roult's law?

  1. $P _A < X _AP _A^o$
  2. $\Delta H _{mix} < 0$
  3. $\Delta V _{mix} < 0$

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A solution showing negative deviation from Raoult's law has P_A < X_A * P_A^0, delta H_mix < 0, and delta V_mix < 0. Since all these statements are true for negative deviation, the claim that they are false is incorrect, making 'None of the above' the correct choice.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

Volume of mixing for a liquid solution is :

  1. may be positive or negative depending on the nature of liquids

  2. 0

  3. +ve

  4. -ve
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The volume of mixing (delta V_mix) for a liquid solution can be positive (expansion), negative (contraction), or zero (ideal solution), depending on the intermolecular interactions between the components.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

What is not something that a phase equilibrium line shows?

  1. The equilibrium point between solid and liquid

  2. The equilibrium point between liquid and gas

  3. The equilibrium point between liquid and solid

  4. The equilibrium point between solid and gas

  5. The equilibrium point between gas and vapor
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The phase equilibrium line does not show the equilibrium point between gas and vapor.
Because the gas and vapor belongs to the same phase.


The correct option is $E$.

Multiple choice chemistry chemical equilibrium equilibrium in physical processes introduction to equilibrium chemical equilibrium and acids-bases

Which of the following solutions does not  show positive deviation? 

  1. Acetone and Ethanol

  2. Toluene and Benzene

  3. Water and Ethanol

  4. Water and Methanol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Toluene and Benzene form an ideal solution because their molecules are very similar in size and polarity, meaning they do not show significant positive or negative deviations from Raoult's law.