Equilibrium Test

Result

Equilibrium Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

The following reaction occurs in the blast furnace where iron ore is reduced to iron metal:
$$F{ e}_{ 2 }{ O}_{ 3 }(s)+3CO(g)\rightleftharpoons Fe(l)+3C{ O}_{2 }(g)$$
Using the Le Chatelier's principle, predict which one of the following will not disturb the equilibrium?

A
Removal of CO

B
Removal of $$ C{ O}_{ 2 } $$

C
Addition of $$ C{ O}_{ 2 } $$

D
Addition of $$ F{ e }_{ 2}{ O }_{ 3 } $$
Question 2
1 / -0

In an aqueous solution of volume 500 mL, the $$[Cu^{2+}]$$ was $$xM$$ when the given reaction reached equilibrium. When 500 mL of water is further added, at the equilibrium $$[Cu^{2+}]$$ will be:

$$2Ag^++Cu \rightleftharpoons Cu^{2+}+2Ag$$

A
$$2x\ M$$

B
$$x\ M$$

C
between $$x\ M$$ and $$x/2\ M$$

D
less than $$x/2\ M$$

Solution
Question 3
1 / -0

$$N_2(g)+3H_2(g) \rightleftharpoons 2NH_3(g)$$ for the reaction initially the mole ratio was $$1:3$$ of $$N_2:H_2$$. At equilibrium $$50\%$$ of each has reacted. If the equilibrium pressure is p, the partial pressure of $$NH_3$$ at equilibrium is:-

A
$$\cfrac p 3$$

B
$$\cfrac p 4$$

C
$$\cfrac p 6$$

D
$$\cfrac p 8$$

Solution
Question 4
1 / -0

Which of the following salt solution will act as a buffer?

A
$$C{H_3}COON{H_4}\left( {aq.} \right)$$

B
$$N{H_4}Cl\left( {aq.} \right)$$

C
$$C{H_3}COONa\left( {aq.} \right)$$

D
$$NaCl\left( {aq.} \right)$$
Question 5
1 / -0

$$\frac { N } { 10 }$$ acetic acid was titrated with $$\frac { N } { 10 }$$ NaOH.When $$25 \% , 50 \%$$ and $$75$$$$\%$$ of titration is over then the pH of the solution will be $$: \left[ \mathrm { K } _ { a } = 10 ^ { - 5 } \right]$$

A
$$5 + \log 1 / 3,5,5 + \log 3$$

B
$$5 + \log 3,4,5 + \log 1 / 3$$

C
$$5 - \log 1 / 3,5,5 - \log 3$$

D
$$5 - \log 1 / 3,4,5 + \log 1 / 3$$

Solution

t CH_3COOH NaOH CH_3COO^-Na^+

0 0.1 0.1

25% 0.1-0.025 0.1-0.025 0.025

50% 0.1-0.050 0.1-0.050 0.050

75% 0.1-0.075 0.1-0.075 0.075

$$pH=- \log K_a+\log \dfrac{[salt]}{[acid]}$$

t= 25%

$$pH=5+\log \dfrac{0.025} {0.075}$$

$$pH=5+\log \dfrac{1} {3}$$

t= 50%

$$pH=5+\log \dfrac{0.050} {0.050}$$

$$pH=5+\log 1=5$$

t= 75%

$$pH=5+\log \dfrac{0.075} {0.025}$$

$$pH=5+\log 3$$
Question 6
1 / -0

In decimolar solution, CH$$_{3}$$COOH is ionised to the extent of 1.3 %. If $$log 1.3 = 0.11$$, what is the pH value of the solution?

A
3.89

B
4.89

C
2.89

D
Unpredictable

Solution
Question 7
1 / -0

In which case, increase of pressure will favour the reaction towards forward ?

A
$${ H }_{ 2 }O(s)\rightleftharpoons { H }_{ 2 }O(l)$$

B
$${ CO }_{ 2 }(g)\rightleftharpoons { CO}_{ 2 }(aq)$$

C
$${ H }_{ 2 }O(g)\rightleftharpoons { H }_{ 2 }O(l)$$

D
All of these
Question 8
1 / -0

Ionic conductances of hydrated $$M^{+}$$ ions are in the order -

A
$$Li^{+}(aq)>Na^{+}(aq)>K^{+}(aq)>Rb^{+}(aq)>Cs^{+}(aq)$$

B
$$Li^{+}(aq)>Na^{+}(aq)< K^{+}(aq)< Rb^{+}(aq)< Cs^{+}(aq)$$

C
$$Li^{+}(aq)>Na^{+}(aq)>K^{+}(aq)>Rb^{+}(aq)< Cs^{+}(aq)$$

D
$$Li^{+}(aq)< Na^{+}(aq)< K^{+}(aq)< Rb^{+}(aq)< Cs^{+}(aq)$$

Solution
Question 9
1 / -0

In a vessel containing $$N_{2},H_{2}$$ and $$NH_{3}$$ at equilibrium, some helium gas in introduced so that the total pressure increases while temperature and volume remain constant. According to Le Chatelier's principle, the dissociation of $$NH_{3}$$ :

A
increase

B
decrease

C
remains unaltered

D
changes unpredictably
Question 10
1 / -0

Degree of dissociation of 0.1 M HCN solution is 0.01%. Its ionisation constant would be

A
$$10^{-3}$$

B
$$10^{-5}$$

C
$$10^{-7}$$

D
$$10^{-9}$$

Solution