Equilibrium Test

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Equilibrium Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

The equilibrium constants for $$A_2(g) \rightleftharpoons 2A(g)$$ at $$400$$ K and $$600$$ K are $$1 \times 10^{-8}$$ and $$1 \times 10^{-2}$$ respectively. The reaction is:

A
exothermic

B
endothermic

C
may be exothermic or endothermic

D
no heat is evolved or abosorbed

Solution

$${ A }_{ 2 }(g)\rightleftharpoons 2A(g)$$
At 400 K, K=$$1 \times 10^{-8}$$
At 600 K, K=$$1 \times 10^{-2}$$ (which is more)
Hence, more reaction occurs at 600 K. Hence the reaction is endothermic.
Question 2
1 / -0

Pure nitrosyl chloride $$(NOCI)$$ gas was heated to $$240^{o}C$$ in a $$1.0\ L$$ container. At equilibrium the total pressure was $$1.0\ atm$$ and the $$NOCl$$ pressure was $$0.64\ atm$$/ What should be the value of $$K_{p}$$?

A
$$1.02\ atm$$

B
$$16.875\times 10^{-3}\ atm$$

C
$$16\times 10^{-2}\ atm$$

D
$$None\ of\ these$$

Solution

$$2NOCl(g) \rightleftharpoons 2NO(g) +Cl_2(g)$$
At eqn $$P-2x$$ $$2x$$ $$x$$
$$P+x=1$$; $$P-2x=0.64$$, $$x=0.12$$
$$K_p=\dfrac{(0.24)^2(0.12)}{(0.64)^2}$$
$$=16.875\times 10^{-3}\ atm$$
Question 3
1 / -0

Le-Chatelier's principle is not applicable to which of the following system?

A
$$P{ Cl }_{ 5(g) }\rightleftharpoons P{ Cl }_{ 3(g) }+{ Cl }_{ 2(g) }$$

B
$${ RCOOH }_{ (l)} + R'{OH}_{(l)}\rightleftharpoons { RCOOR' }_{ (l) }+{ H }_{ 2 }O_{(l)}$$

C
$${ C }_{ g (s) }\rightleftharpoons { C }_{ d(s) }$$

D
All of these

Solution

Le-Chatelier's principle is not applicable to pure solids and liquids since they experience negligible change in concentration during chemical equillibrium. Hence C is correct
Question 4
1 / -0

For the equilibrium $$ N_2 + 3H_2 \rightleftharpoons 2NH_3, K_6 $$ at 1000 K is $$ 2.37 \times 10^{-3} $$
Equilibrium $$ [N_2] = 2.M [H_2] = 3M $$the concentration of $$ NH_3 $$ is:

A
0.00358 M

B
0.0358 M

C
0.358 M

D
3.58 M

Solution

we have,

$$K=\dfrac{[H_2]^3[N_2]^1}{[NH_3]^2}$$

$$2.37\times 10^{-3}=\dfrac{[3M]^3[2M]^1}{[xM]^2}$$

$$[xM]^2=\dfrac{[3M]^3[2M]^1}{2.37\times 10^{-3}}$$

solving the above equation, we get,

concentration of $$NH_3=0.00358M$$
Question 5
1 / -0

Which pair can not act as buffer?

A
$$CH_3COOH + CH_3COONa$$

B
Borax + $$H_3BO_3$$

C
$$HCl + NH_4OH$$

D
$$NH_4Cl + HCl$$

Solution

$$NH_4Cl$$ and $$HCl$$ can not behave as buffer
$$NH_4Cl$$ is formed from the reaction of $$NH_3$$, a weak base, and $$HCl$$, a strong acid.
Question 6
1 / -0

For reaction, $$aA\rightleftharpoons \ell L+mM$$. In the condition of sudden increase of volume, degree of dissociation decrease It represents:

A
$$a<\left( \ell +m \right) $$

B
$$a=(\left( \ell +m \right) $$

C
$$a=\left( \ell -m \right) $$

D
$$a>\left( \ell +m \right) $$
Question 7
1 / -0

In the following equilibrium,
$$\dfrac{1}{2}N_2(g) +O_2(g) \leftrightharpoons NO_2(g) + heat$$

A
the equilibrium will shift to the right due to the right due to decrease in the concentration of $$N_2$$

B
the equilibrium will shift to the right due to the right due to decrease in temperature

C
the equilibrium will shift to the due to an increase in volume

D
the equilibrium will shift to the left due to an increase in the concentration of $$O_2$$
Question 8
1 / -0

$$C+O_{2}\rightarrow CO_{2} +Heat $$

A
Combination reaction

B
Decomposition reaction

C
Both $$(1)$$ and $$(2)$$

D
none of these

Solution

The reaction between carbon and oxygen to form carbon dioxide can be classified as a combination reaction as carbon directly combines with oxygen to form carbon dioxide $$(CO_2)$$ and gives off heat and light.

Decomposition reaction means breaking of a compound into simpler compounds or molecules on the application of heat or electricity. It is the reverse of a combination reaction.

Hence, option (A) is correct.
Question 9
1 / -0

If little heat is added to $$ice \leftrightharpoons liquid$$, equilibrium in a sealed container, then:

A
pressure will rise

B
temperature will rise

C
temperature will fall

D
no change in pressure and temperature
Question 10
1 / -0

Dissociation constant of $$ 0.002 M $$ acotic add collection having conduct of $$ 8 \times 10^{-5} scm^{-1} $$ & $$ \mathring {A} $$ $$ 400 s cm^2 mole^{-1} $$ is

A
$$ 1.7 \times 10^{-4} $$

B
$$ 2.1 \times 184 $$

C
$$ 2.9 \times 10^{-4} $$

D
$$ 1.7 \times 10^{-3} $$

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Re-Attempt Weekly Quiz Competition

At eqn	$$P-2x$$	$$2x$$	$$x$$
$$P+x=1$$;	$$P-2x=0.64$$,	$$x=0.12$$

Equilibrium Test - 39

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Equilibrium Test - 39

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Question 1

exothermic

endothermic

may be exothermic or endothermic

no heat is evolved or abosorbed

Solution

Question 2

$$1.02\ atm$$

$$16.875\times 10^{-3}\ atm$$

$$16\times 10^{-2}\ atm$$

$$None\ of\ these$$

Solution

Question 3

$$P{ Cl }_{ 5(g) }\rightleftharpoons P{ Cl }_{ 3(g) }+{ Cl }_{ 2(g) }$$

$${ RCOOH }_{ (l)} + R'{OH}_{(l)}\rightleftharpoons { RCOOR' }_{ (l) }+{ H }_{ 2 }O_{(l)}$$

$${ C }_{ g (s) }\rightleftharpoons { C }_{ d(s) }$$

All of these

Solution

Question 4

0.00358 M

0.0358 M

0.358 M

3.58 M

Solution

Question 5

$$CH_3COOH + CH_3COONa$$

Borax + $$H_3BO_3$$

$$HCl + NH_4OH$$

$$NH_4Cl + HCl$$

Solution

Question 6

$$a<\left( \ell +m \right) $$

$$a=(\left( \ell +m \right) $$

$$a=\left( \ell -m \right) $$

$$a>\left( \ell +m \right) $$

Question 7

the equilibrium will shift to the right due to the right due to decrease in the concentration of $$N_2$$

the equilibrium will shift to the right due to the right due to decrease in temperature

the equilibrium will shift to the due to an increase in volume

the equilibrium will shift to the left due to an increase in the concentration of $$O_2$$

Question 8

Combination reaction

Decomposition reaction

Both $$(1)$$ and $$(2)$$

none of these

Solution

Question 9

pressure will rise

temperature will rise

temperature will fall

no change in pressure and temperature

Question 10

$$ 1.7 \times 10^{-4} $$

$$ 2.1 \times 184 $$

$$ 2.9 \times 10^{-4} $$

$$ 1.7 \times 10^{-3} $$

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