Equilibrium Test

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Equilibrium Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

An acidic buffer solution has $$[HA]=1.0\,M$$ and $$[NaA]=1.0M$$. To $$(10+x)mL$$ of this buffer solution $$9\,mL$$ of $$1.0\,M\,HCl$$ is added so that $$pH$$ changes by one unit. The value of x is

A
$$0.1$$

B
$$10$$

C
$$1.5$$

D
$$1.0$$

Solution
Question 2
1 / -0

Which of the following combinations will make a buffer solution?
(i) $$CH_3COONa\ (2 mol) + HCl\ (1 mol) $$
(ii) $$CH_3COOH\ (2 mol) + NaOH\ (1 mol) $$
(iii)$$ CH_3COOH\ (1 mol) + CH_3COONa\ (1 mol) $$

A
$$(iii) $$

B
$$(i), (ii)$$

C
$$(ii), (iii)$$

D
$$(i), (ii), (iii) $$
Question 3
1 / -0

$$pH$$ of following solution is not affected by dilution:

A
$$0.01\ M\ CH_{3}COONH_{4}$$

B
$$0.01\ M\ NaH_{2}PO_{4}$$

C
$$0.01\ M\ NaHCO_{3}$$

D
All of these
Question 4
1 / -0

Which may be added to one litre water to act as a buffer.

A
1 mole of $$HC_{2}H_{3}O_{2}$$ and 1 mole of Hcl

B
1 mole of $$NH_{4}OH$$ and 0.5 mole of $$NaOH$$

C
1 mole of $$NH_{4}Cl$$ and 1 mole of Hcl

D
1 mole of $$HC_{2}H_{3}O_{2}$$ and 0.5 mole of $$NaOH$$
Question 5
1 / -0

In which of the following reaction the concentration of the product is higher than concentration of reactant at equilibrium?

A
$$A\rightleftharpoons B,K=0.001$$

B
$$M\rightleftharpoons N,K=10$$

C
$$X\rightleftharpoons Y,K=0.005$$

D
$$R\rightleftharpoons P,K=0.01$$

Solution
Question 6
1 / -0

If $${Q_c} = \cfrac{{{{\left( {2x} \right)}^2}}}{{{{\left( {a - x} \right)}^2}}}$$ and $${K_c} = \cfrac{{2{x^2}}}{{a - {x^2}}}$$, the affect of the volume on the equilibrium:

A
Shift right on increasing volume.

B
Shift left on increasing volume.

C
Volume wont disturb the equilibrium

D
None of the above
Question 7
1 / -0

$$N_{2}(g)+3H_{2}(g) \rightleftharpoons 2NH_{3}(g)$$

In the reaction given above, the addition of small amount of an inert gas at constant pressure will shift the equilibrium towards which side of

A
$$LHS$$ (Left Hand Side)

B
$$RHS$$ (Right Hand Side)

C
neither side

D
either side.

Solution
Question 8
1 / -0

Which of the following mixture can form buffer solution ?

A
$$C{H_3}COOH + C{H_3}COONa$$

B
$$NaCl + NaOH$$

C
$$HCl + N{H_4}Cl$$

D
$$C{H_3}COOH + HCl$$

Solution
Question 9
1 / -0

If pH of a saturated solution of $$Mg(OH)_2$$ is 12.
Find its $$K_{sp}$$

A
$$2\times 10^{-4}$$

B
$$5\times 10^{-5}$$

C
$$4\times 10^{-6}$$

D
$$5\times 10^{-7}$$
Question 10
1 / -0

Which of the following will not function as buffer solution?

A
$${\text{Na}}{{\text{H}}_{\text{2}}}{\text{P}}{{\text{O}}_{\text{4}}}{\text{ + N}}{{\text{a}}_{\text{2}}}{\text{HP}}{{\text{O}}_{\text{4}}}\left( {{\text{1:1}}\,{\text{Molar}}\,{\text{Ratio}}} \right)$$

B
$${\text{N}}{{\text{H}}_4}{\text{Cl + NaOH}}\left( {{\text{2:1}}\,{\text{Molar}}\,{\text{Ratio}}} \right)$$

C
$${\text{HCOOH + NaOH}}\left( {{\text{1:1}}\,{\text{Molar}}\,{\text{Ratio}}} \right)$$

D
$${\text{HCOOH + HCOONa}}\left( {{\text{1:1}}\,{\text{Molar}}\,{\text{Ratio}}} \right)$$

Solution