Necessary Conditions for Equilibrium

Q.

In the decomposition of Lead (II) Nitrate to give lead (II) oxide, Nitrogen dioxide, and Oxygen gas, the coefficient of Nitrogen dioxide in the balanced equation is

1. 1

2. 2

3. 3

4. 4

Q. Which of the following conditions represents an equilibrium?

1. Melting of ice in an open vessel, temperature of ice is constant
2. Few drops of water is present along with air inside a balloon, temperature of balloon is constant
3. Water is boiling in an open vessel over stove, temperature of water is constant
4. None of the above

Q. In the system,
$LaC{l}_{3\left(g\right)}+H_{2}O\left(g\right)+Heat\rightleftharpoons LaCl{O}_{\left(s\right)}+2HC{l}_{\left(g\right)},$
is established. More water vapor is added to reestablish the equilibrium. The pressure of water vapor is doubled. The factor by which pressure of HCl is changed is

1. $\sqrt{2}$
2. $\sqrt{5}$
3. 2
4. $\sqrt{3}$

Q. A catalyst speeds up a chemical reaction by :

1. providing an alternative reaction mechanism of lower activation energy.
2. changing the stoichiometry.
3. none of the above
4. increasing the activation energy.

Q. Which of the following conditions represents an equilibrium?

1. Melting of ice in an open vessel, temperature of ice is constant
2. Few drops of water is present along with air inside a balloon, temperature of balloon is constant
3. Water is boiling in an open vessel over stove, temperature of water is constant
4. None of the above

Q. A catalyst remains unchanged during the reaction :

1. True
2. False

Q.

Which is true for a liquid-gas equilibrium having an equilibrium constant K?

1. K is dependent on temperature

2. Pressure doesn’t affect amount of gas

3. matter is not exchanged at the interface

4. all of the above

Q. Which of the following conditions represents an equilibrium?

1. Melting of ice in an open vessel, temperature of ice is constant
2. Few drops of water is present along with air inside a balloon, temperature of balloon is constant
3. Water is boiling in an open vessel over stove, temperature of water is constant
4. None of the above

Q. A catalyst in finely divided state is more efficient because in this state_______.

1. All of the above
2. It has got large activation energy
3. It can react with one reactant more effectively
4. It has large surface area

Q. In the system,
$LaC{l}_{3\left(g\right)}+H_{2}O\left(g\right)+Heat\rightleftharpoons LaCl{O}_{\left(s\right)}+2HC{l}_{\left(g\right)},$
is established. More water vapor is added to reestablish the equilibrium. The pressure of water vapor is doubled. The factor by which pressure of HCl is changed is

1. 2
2. $\sqrt{2}$
3. $\sqrt{3}$
4. $\sqrt{5}$

Q.

A catalyst

1. changes the ΔG of a reaction

2. is part of the balanced chemical equation

3. changes the mechanisms for a reaction

4. slows down the rate of a reaction

Q.

A catalyst will increase the rate of a chemical reaction by

1. shifting the equilibrium to the right

2. lowering the activation energy

3. shifting the equilibrium to the left

4. increasing the activation energy

Q. Which of the following can be measured by the Ostwald-Walker dynamic method?

1. Relative lowering of vapour pressure
2. All of these
3. Vapour pressure of the solvent
4. Lowering of vapour pressure

Q. In the system,
$LaC{l}_{3\left(g\right)}+H_{2}O\left(g\right)+Heat\rightleftharpoons LaCl{O}_{\left(s\right)}+2HC{l}_{\left(g\right)},$
is established. More water vapor is added to reestablish the equilibrium. The pressure of water vapor is doubled. The factor by which pressure of HCl is changed is

1. 2
2. $\sqrt{2}$
3. $\sqrt{3}$
4. $\sqrt{5}$

Q. Which reaction has the greatest equilibrium constant ($K_p$)?

1. ${PCl}_3\left(g\right)+{Cl}_2\left(g\right)\rightleftharpoons {PCl}_5\left(g\right)$
   When $P{Cl}_3=3atm$, ${Cl}_2=4atm$, $P{Cl}_5=1atm$
2. $2{SO}_2+O_2\rightleftharpoons 2{SO}_3$
   When ${SO}_2=2atm$, $O_2=2atm$, ${SO}_3=3atm$
3. $I_2\left(g\right)+H_2\left(g\right)\rightleftharpoons 2HI\left(g\right)$
   When $I_2=1atm$, $H_2=2atm$, $HI=2atm$
4. $N_2\left(g\right)+{3H}_2\left(g\right)\rightleftharpoons 2{NH}_3\left(g\right)$
   When $N_2=1atm$, $H_2=2atm$, ${NH}_3=6atm$

Q.

Which is true for a liquid-gas equilibrium having an equilibrium constant K?

1. K is dependent on temperature

2. Pressure doesn’t affect amount of gas

3. matter is not exchanged at the interface

4. all of the above

Q. Which reagent is used to remove $S{O}_4^{2-}$ or $C{l}^{-}$ from water?

1. $NaOH$
2. $Pb{\left(N{O}_3\right)}_2$
3. $BaS{O}_4$
4. $KOH$