JEE Advanced 2023 Paper 1 Online

MCQ (Single Correct Answer)

-1

On decreasing the $p \mathrm{H}$ from 7 to 2 , the solubility of a sparingly soluble salt (MX) of a weak acid (HX) increased from $10^{-4} \mathrm{~mol} \mathrm{~L}^{-1}$ to $10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}$. The $p \mathrm{~K}_{\mathrm{a}}$ of $\mathrm{HX}$ is

JEE Advanced 2018 Paper 2 Offline

MCQ (Single Correct Answer)

-1

Dilution processes of different aqueous solutions, with water, are given in LIST - I. The effects of dilution of the solutions on $$\left[ {{H^ + }} \right]$$ are given in LIST - II

(Note: Degree of dissociation (a) of weak acid and weak base is $$<<1;$$ degree of hydrolysis of salt $$<<1;$$ $$\left[ {{H^ + }} \right]$$ represents the concentration of $${H^ + }$$ ions)

	LIST-I		LIST-II
P.	(10 mL of 0.1 M NaOH + 20 mL of 0.1 M acetic acid) diluted to 60 mL	1.	the value of [H⁺] does not change on dilution
Q.	(20 mL of 0.1 M NaOH + 20 mL of 0.1 M acetic acid) diluted to 80 mL	2.	the value of [H⁺] changes to half of its initial value on dilution
R.	(20 mL of 0.1 M HCL + 20 mL of 0.1 M ammonia solution) diluted to 80 mL	3.	the value of [H⁺] changes to two times of its initial value on dilution
S.	10 mL saturated solution of Ni(OH)₂ in equilibrium with excess solid Ni(OH)₂ is diluted to 20 mL (solid Ni(OH)₂ is still present after dilution).	4.	the value of [H⁺] changes to $${1 \over {\sqrt 2 }}$$ times of its initial value on dilution
		5.	the value of [H⁺] changes to $$\sqrt 2 $$ times of its initial value on dilution

Match each process given in LIST-I with one or more effect(s) in LIST-II. The correct option is :

$$P - 4;Q - 2;R - 3;S - 1$$

$$P - 4;Q - 3;R - 2;S - 3$$

$$P - 1;Q - 4;R - 5;S - 3$$

$$P - 1;Q - 5;R - 4;S - 1$$

IIT-JEE 2008 Paper 2 Offline

MCQ (Single Correct Answer)

-1

Solubility product constants (K$$_{sp}$$) of salts of types MX, MX$$_2$$ and M$$_3$$X at temperature T are 4.0 $$\times$$ 10$$^{-8}$$, 3.2 $$\times$$ 10$$^{-14}$$ and 2.7 $$\times$$ 10$$^{-15}$$, respectively. Solubilities (mol dm$$^{-3}$$) of the salts at temperature 'T' are in the order:

MX > MX$$_2$$ > M$$_3$$X

M$$_3$$X > MX$$_2$$ > MX

MX$$_2$$ > M$$_3$$X > MX

MX > M$$_3$$X > MX$$_2$$

IIT-JEE 2008 Paper 1 Offline

MCQ (Single Correct Answer)

-1

2.5 mL of $$\frac{2}{5}$$M weak monoacidic base (K$$_b$$ = 1 $$\times$$ 10$$^{-12}$$ at 25$$^\circ$$C) is titrated with $$\frac{2}{15}$$M HCl in water at 25$$^\circ$$C. The concentration of H$$^+$$ at equivalence point is (K$$_w$$ = 1 $$\times$$ 10$$^{-14}$$ at 25$$^\circ$$C).

3.7 $$\times$$ 10$$^{-13}$$ M

3.2 $$\times$$ 10$$^{-7}$$ M

3.2 $$\times$$ 10$$^{-2}$$ M

2.7 $$\times$$ 10$$^{-2}$$ M

JEE Advanced Subjects