Equilibrium Test

Result

Equilibrium Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

Which equilibrium favours the increase of pressure?

A
$${ PCl }_{ { 5 }_{ \left( g \right) } }\rightleftharpoons { PCl }_{ 3_{ \left( g \right) } }+{ Cl }_{ { 2 }_{ \left( g \right) } }$$

B
$${ H }_{ { 2 }_{ \left( g \right) } }+I_{ 2_{ \left( g \right) } }\rightleftharpoons { 2HI }_{ _{ \left( g \right) } }$$

C
$${ 2SO }_{ { 2 }_{ \left( g \right) } }+O_{ 2_{ \left( g \right) } }\rightleftharpoons 2S{ O }_{ 3_{ \left( g \right) } }$$

D
$${ NH }_{ 4 }{ Cl }_{ \left( g \right) }\rightleftharpoons N{ H }_{ { 3 }_{ \left( g \right) } }+H{ Cl }_{ \left( g \right) }$$
Question 2
1 / -0

At $${ 25 }^{ \circ }C$$ the dissociation constant of a base , BOH, is $$1.0\times { 10 }^{ -12 }$$. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be

A
$$1.0\times { 10 }^{ -6 }{ molL }^{ -1 }$$

B
$$1.0\times { 10 }^{ -7 }{ molL }^{ -1 }$$

C
$$2.0\times { 10 }^{ -6 }{ molL }^{ -1 }$$

D
$$1.0\times { 10 }^{ -5 }{ molL }^{ -1 }$$
Question 3
1 / -0

A solution is saturated with respect to $$AgSCN$$ as well as $$AgBr$$. The concentration of $$Ag^{+}$$ in the solution would be:
($$ K_{sp}$$ for $$AgSCN = 1.2 \times 10^{-12}$$ and for $$AgBr = 5 \times 10^{-13}$$)

A
$$1.3 \times 10^{-5}$$

B
$$1.3 \times 10^{-12}$$

C
$$1.3 \times 10^{-6}$$

D
$$1.3 \times 10^{-8}$$

Solution
Question 4
1 / -0

For preparing a buffer solution of pH = 7.0, which buffer system you will choose?

A
$$H_3PO_4,H_2PO_4^-$$

B
$$H_2PO_4^-, HPO_4^{2-}$$

C
$$HPO^{2-}_4, PO^{3-}_4$$

D
$$H_3PO_4, PO_4^{3-}$$

Solution
Question 5
1 / -0

10 ml of 0.2 M $$ AgNO_3 $$ is mixed with 10 ml of 0.1 M $$NaCl$$. What is the concenctration of $$ Cl^- $$ in the resulting solution $$[ K_{sp} (AgCl) = 10^{-10} M^2] $$

A
$$ 10^{-5} M $$

B
$$ 10^{-9} M $$

C
$$ 2 \times 10^{-9} M $$

D
$$ 10^{-8} M $$

Solution
Question 6
1 / -0

In a reaction:
$${ A }_{ 2 }\left( g \right) +{ 4B }_{ 2 }\left( g \right) \leftrightharpoons { 2AB }_{ 4 }\left( g \right); \Delta H<0$$

The formation of $${ A }B_{ 4 }\left( g \right) $$ will be favoured by:

A
low temperature and high pressure

B
high temperature and high pressure

C
low temperature and low pressure

D
high temperature and low pressure

Solution
Question 7
1 / -0

0.1 M acetic acid gets 1% ionised. If it ionise 10 times, then concentration of $$ [H^+] $$ will be

A
0.001

B
0.01

C
0.05

D
0.1

Solution
Question 8
1 / -0

$${ pK_b }$$ of $${ NH }_{ 3 }$$ is 4.74 and $${ pK }_{ b }$$ of $${ A }^{ - },{ B }^{ - }$$ and $${ C }^{ - }$$ are 1, 5 and 6 respectively, aqueous solution of 0.01 M has pH in the increasing order:

A
$${ NH }_{ 4 }A<{ NH }_{ 4 }B<{ NH }_{ 4 }C$$

B
$${ NH }_{ 4 }C<{ NH }_{ 4 }B<{ NH }_{ 4 }A$$

C
$${ NH }_{ 4 }C<{ NH }_{ 4 }A<{ NH }_{ 4 }B$$

D
All have equal $$pH$$
Question 9
1 / -0

The solution of blue vitriol in water is acidic because:

A
$$CuSO_4$$ reacts with water

B
$$Cu^{2+}$$ reacts with water

C
$$SO^{2-}_4$$ reacts with water

D
$$CuSO_4$$ removes $$OH^-$$ ions from water
Question 10
1 / -0

The pH of 0.2 M solution of acid HQ = 3. Then the value of $$K_{a}$$ for HQ will be

A
$$10^{-7}$$

B
$$5\times10^{-6}$$

C
$$5\times10^{-3}$$

D
$$3\times10^{-3}$$

Solution