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Ionic Equilibrium Quiz

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Question 1

Consider the coordination compound,[Co(NH₃)₆]Cl₃. In the formation of this complex, the species which acts as the Lewis acid is

Question 2

Which one of the following is an amphoteric oxide?

Question 3

How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?

Question 4

Three reactions involving H₂PO₄^-are given below:
(i)H₃PO₄ + H₂O -> H₃O⁺ + H₂PO₄^-
(ii) H₂PO₄^- + H₂O-> H₃O⁺ + HPO₄^2-
(iii)H₂PO₄^- + HO^- -> O^2- + H₃PO₄
In which of the above does H₂PO₄^-act as an acid?

Question 5

Which of the following salts is the most basic in aqueous solution ?

Question 6

Assuming that the degree of hydrolysis is small, the pH of 0.1 M solution of sodium acetate

will be :

Question 7

Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionisation constant of HA is 10^-5, the ratio of salt to acid concentration in the buffer solution will be:

Question 8

pK_a of a weak acid (HA) and pK_b of a weak base (BOH) are 3.2 and 3.4, respectively.
The pH of their salt (AB) solution is:

Question 9

At 25 °C, the solubility product of Mg(OH)₂ is 1.0 × 10^–11. At which pH, will Mg²⁺ ions start precipitating in the form of Mg(OH)₂ from a solution of 0.001 M Mg²⁺ ions?

Question 10

50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pK_b of ammonia solution is 4.75, the pH of the mixture will be:

Question 11

The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is

Question 12

An aqueous solution contains an unknown concentration of

When 50 mL of a 1 M solution of

is added,

just begins to precipitate. The final volume is 500 mL. The solubility product of

What is the original concentration of

Question 13

The minimum volume of water required to dissolve 0.1 g lead(II) chloride to get a saturated solution

atomic mass of Pb=207u) is :

Question 14

Zirconium phosphate

dissociates into three zirconium cations of charge +4 and four phosphate anions of charge -3. If molar solubility of zirconium phosphate is denoted by S and its solubility product by K_sP then which of the following relationship between S and K_sP is correct?

Question 15

Solubility product of silver bromide is

. The quantity of potassium bromide (molar mass taken as 120 g mol^–1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is

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Sep 17JEE & BITSAT