Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 15

EASY

Chemistry

IMPORTANT

Earn 100

The EDTA titrations are generally carried out at a $pH$ of $10$ . Why is it necessary to buffer the $pH$ at $10$ ?

50% studentsanswered this correctly

Important Questions on Equilibrium

HARD

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 16

An acid-base indicator which is a weak acid has a ${pK}_{a}$ value $= 5.5 .$ At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half-way between those of its acid and conjugate base forms? ${pK}_{a}$ of acetic acid $= 4.75$

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 17

0.1 mol HCI

is dissolved in distilled water of volume

V

then

V \overset{\lim}{\to} \infty {(pH)}_{solution}

is equal to-

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 18

Which of the following is true-

EASY

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 19

Which of the following orders regarding the base strength of a leaving group in a reaction of an acid derivative with a nucleophile is correct:

EASY

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 20

The correct order for the increasing extent of hydrolysis is-

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 22

Which of the following acids has never been isolated:

EASY

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 23

Consider the addition of

{MgF}_{2}

and

{CaF}_{2}

in water as given in (a) and (b)
(a)

4.96 mg

of

{MgF}_{2}

in

125 mL

of pure water

K_{sp}

of

{MgF}_{2} = 3.2 \times 10^{- 8}

(b) $3.9 \mathrm{mg}$ of $\mathrm{CaF}_{2}$ in $100 \mathrm{~mL}$ of pure water,

K_{sp}

of

{CaF}_{2} = 4 \times 10^{- 12}

. Choose the correct statement(s) from amongst the following.

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course JEE Advanced>Chapter 7 - Equilibrium>Exercise 1>Q 24

A

2.5 g

impure sample containing weak monoacidic base (Molecular weight

= 45

) is dissolved in

100 mL

water and titrated with

0.5 MHCl

at

25 ° C

. When

1 / 5^{th}

of the base is neutralized, the

pH

is found to be

9

and at equivalent point, the

pH

of solution is

4.5

(

\log 2 = 0.3

antilog

0.4 = 2.5

).