Chemical Equilibrium Test

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Chemical Equilibrium Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

The volume of a closed reaction vessel in which the equilibrium 2SO₂(g)+O₂(g)⇌2SO₃(g) sets is halved now:

A
the rates of forward and backward reactions will remain the same .

B
the equilibrium will not shift

C
the equilibrium will shift to the right

D
the rate of forward reaction will become double that of reverse reaction and the equilibrium will shift to the right

Solution

2SO₂(g)+O₂(g)⇌2SO₃(g) In this reaction three moles (or volumes`) of reactants are converted into two moles (or volumes) of products i.e. there is a decrease in volume and so if the volume of the reaction vessel is halved the equilibrium will be shifted to the right i.e. more product will be formed and the rate of forward reaction will increase i.e.double that of reverse reaction.
Question 2
1 / -0

H₂(g)+I₂(g)2HI(g)

When 46 g of I₂ and 1g of H₂ gas heated at equilibrium at 450°C, the equilibrium mixture contained 1.9g of I2. How many moles of I₂ and HI are present at equilibrium?

A
0.0075 and 0.147 moles

B
0.0050 and 0.147 moles

C
0.0075 and 0.347 moles

D
0.0052 and 0.347 moles

Solution
Question 3
1 / -0

One mole of nitrogen and three moles of hydrogen are mixed in a 4 litre container. If 0.25 percent of nitrogen is converted to ammonia by the following reaction.

N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

What will be the value of K for the following equilibrium?

1/2 N₂(g) + 3/2 H₂(g) ⇌ NH₃(g).

A
1.49×10⁻⁵L mol⁻¹

B
2.22×10⁻¹⁰L mol⁻¹

C
3.86×10⁻³L mol⁻¹

D
None of these

Solution
Question 4
1 / -0

When ethanol and acetic acid were mixed together in equimolar proportion, 66.6% get converted into ethyl acetate. Calculate K_c . Also calculate the quantity of ester produced if one mole of acetic acid is treated with 0.5 mole and 4 mole of alcohol respectively.

A
4, 0.93, 0.43

B
0.93, 4, 0.43

C
0.43, 0.93, 4

D
4, 0.43, 0.93

Solution
Question 5
1 / -0

One mole of ammonium carbamate dissociate as shown below at 500 K.

NH₂COONH₄(s) ⇌ 2NH₃(g)+CO₂(g) if the pressure exerted by the released gases is 3.0 atm. the value of K_p is

A
7 atm

B
3 atm

C
4 atm

D
8 atm

Solution
Question 6
1 / -0

Iron filling and water were placed in a 5 litre tank and sealed. The tank was heated to 1273 K. Upon analysis the tank was found to contain 1.10 gm of hydrogen and 42.5 gm of water vapour. If the reaction in the tank is represented by 3Fe(s) + 4H₂0(g) ⇌ Fe₃O₄ (s) + 4H₂(g) the equilibrium constant will b

A
2.949 × 10³

B
6.490 × 10³

C
4.940 × 10³

D
3.200 × 10³

Solution

In the reactions,
Question 7
1 / -0

At 700K, the equilibrium constant, K_p for the reaction 2SO₃(g) ⇌ 2SO₂(g) + O2(g) is 1.80×10⁻³kpa. What is the numeriacal value in moles per litre of K_c for this reaction at the same temperaure?

A
3.09×10⁻⁷ mol L⁻¹

B
3.09×10⁻⁶ mol L⁻¹

C
3.09×10⁷ mol L⁻¹

D
3.09×10⁶ mol L⁻¹

Solution
Question 8
1 / -0

The value of K_c for the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g) is 0.50 at 400° C. What will be the value of K_p at 400°C when concentrations are expressed in mol L^-1 and pressure in atmosphere ?

A
2×10^-4

B
2.80 × 10^-6

C
2.80 × 10^-4

D
2×10^-6

Solution
Question 9
1 / -0

The equilibrium constant for the reaction H₂ (g)+ S (s) ⇌ H₂S (g) is 18.5 at 935 K and 9.25 at 1000 K respectively. The change in enthalpy of the reaction will be :

A
zero

B
+ ve

C
- ve

D
cannot be predicted

Solution

Since(K_eq )₂ < (K_eq )₁ whileT₂>T₁

∴ Reaction is exothermic Hence, △H = -ve
Question 10
1 / -0

The equilibrium constant K_c for the decomposition of PCl₅ is 0.0625 mol L^-I at 300°C. What will be the value of K_p ?

A
2.936 atm

B
2.936 atm

C
3.336 atm

D
5.123 atm

Solution