Which of the following cases leads to the reaction remaining fastest to completion?

1. $\mathrm{K}=1$

2. $\mathrm{K}=10$

3. $\mathrm{K}={10}^{-2}$

4. $\mathrm{K}={10}^2$

Consider the following reactions:

A. ${\mathrm{AB}}_2\left(\mathrm{g}\right)+\frac{1}{2}{\mathrm{B}}_2\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{AB}}_3\left(\mathrm{g}\right)$

B. $2{\mathrm{AB}}_3\left(\mathrm{g}\right)\rightleftharpoons 2{\mathrm{AB}}_2+{\mathrm{B}}_2\left(\mathrm{g}\right)$

If K₁ and K₂ are the equilibrium constants at $27°\mathrm{C}$ in reactions A and B respectively, then K₁, and K₂ are related as

1. ${\mathrm{K}}_1^2={\mathrm{K}}_2$

2. ${\mathrm{K}}_2{\mathrm{K}}_1^2=1$

3. ${\mathrm{K}}_1=2{\mathrm{K}}_2$

4. ${\mathrm{K}}_1{\mathrm{K}}_2^2=1$

For the reaction
H₂ + I₂ ⇌ 2HI, the equilibrium concentrations of hydrogen, iodine, and hydrogen iodide are 8 mol L⁻¹, 3 mol L⁻¹, and 28 mol L⁻¹ respectively.

What is the equilibrium constant (Kc) for this reaction?

1. 32.67

2. 28.67

3. 34.67

4. 38.67

1. ${\mathrm{N}}_2+{\mathrm{O}}_2\rightleftharpoons 2\mathrm{NO}$

2. ${\mathrm{H}}_2+{\mathrm{Cl}}_2\rightleftharpoons 2\mathrm{HCl}$

3. $2{\mathrm{SO}}_2+{\mathrm{O}}_2\rightleftharpoons 2{\mathrm{SO}}_3$

4. ${\mathrm{PCl}}_5\rightleftharpoons {\mathrm{PCl}}_3+{\mathrm{Cl}}_2$

Equilibrium constants K₁, and K₂ for the following equilibria

$\mathrm{NO}\left(\mathrm{g}\right)+\frac{1}{2}{\mathrm{O}}_2\stackrel{{\mathrm{K}}_1}{\rightleftharpoons }{\mathrm{NO}}_2\left(\mathrm{g}\right)<mspace\; width="1em"></mspace>\mathrm{and}$
$2{\mathrm{NO}}_2\left(\mathrm{g}\right)\stackrel{{\mathrm{K}}_2}{\rightleftharpoons }2\mathrm{NO}\left(\mathrm{g}\right)+{\mathrm{O}}_2$

are related as

1. ${\mathrm{K}}_2=1/{\mathrm{K}}_1^2$

2. ${\mathrm{K}}_2={\mathrm{K}}_1^2$

3. ${\mathrm{K}}_2=1/{\mathrm{K}}_1$

4. ${\mathrm{K}}_2={\mathrm{K}}_1/2$

In a chemical equilibrium rate constant of forward reaction is $7.5\times {10}^{-4}$ and the equilibrium constant is 1.5. The rate constant of a backward reaction is

1. $2.5\times {10}^4$

2. $5\times {10}^{-4}$

3. $2.5\times {10}^{-4}$

4. $5\times {10}^4$

$\underset{\mathrm{g}}{{\mathrm{PCl}}_5}\rightleftharpoons \underset{\mathrm{g}}{{\mathrm{PCl}}_3}+\underset{\mathrm{g}}{{\mathrm{Cl}}_2}$

For the dissociation of PCl_5- K_c is $2\times {10}^{-7}<mspace\; width="1em"></mspace>\mathrm{at}<mspace\; width="1em"></mspace>27°\mathrm{C}$.

$\mathrm{Find}<mspace\; width="1em"></mspace>∆\mathrm{S}°<mspace\; width="1em"></mspace>\mathrm{If}<mspace\; width="1em"></mspace>∆\mathrm{H}°=28.4<mspace\; width="1em"></mspace>\mathrm{KJ}/\mathrm{m}$

1. -0.0336 KJ/K

2. 0.0336 KJ/K

3. -0.0818 KJ/K

4. 0.338 KJ/K

The value of K_p for the reaction,

$2{\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)\rightleftharpoons 2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{S}}_2\left(\mathrm{g}\right)<mspace\; width="1em"></mspace>\mathrm{is}<mspace\; width="1em"></mspace>1.2\times {10}^{-2}<mspace\; width="1em"></mspace>\mathrm{at}<mspace\; width="1em"></mspace>1065°\mathrm{C}.$

The value of K_c is

1. $<1.2\times {10}^{-2}$

2. $>1.2\times {10}^{-2}$

3. $1.2\times {10}^{-2}$

4. $0.12\times {10}^{-2}$

What volumes of H₂ and NH₃ are required or formed when 100 mL of N₂ reacts completely in the reaction
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)?

1. 300 mL of H₂ and 300 mL of NH₃ 

2. 100 mL of H₂ and 200 mL of NH₃ 

3. 300 mL of H₂ and 200 mL of NH₃ 

4. 100 mL of H₂ and 100 mL of NH₃ 

Find the ratio of volumes of reactants and products when a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is completely converted into ammonia at the same temperature and pressure.

1. 2:1

2. 1:2

3. 1:3

4. 3:1