MEDIUM

Earn 100

Why is it essential to use freshly prepared Mohr's salt solution in the titration of ${KMnO}_{4}$ with Mohr's salt?

47.62% studentsanswered this correctly

Important Questions on Volumetric Analysis

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Two gases - argon (atomic radius

0.07 n m,

atomic weight

40

) and xenon (atomic radius

0.1 n m,

atomic weight

140

) have the same number density and are at the same temperature. The ratio of their respective mean free times is closest to:

HARD

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

The specific heats,

C_{p}

and

C_{v}

of a gas of diatomic molecules,

A,

are given (in units of

J m o l^{- 1} K^{- 1}

) by

29

and

22,

respectively. Another gas of diatomic molecules,

B,

has the corresponding values

30

and

21 .

If they are treated as ideal gases, then:

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

A flask contains a mixture of isohexane and

3

-methylpentane. One of the liquids boils at

63^{o} C

while the other boils at

60^{o} C .

What is the best way to separate the two liquids and which one will be distilled out first?

HARD

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Straight lines

x - y = 7

and

x + 4 y = 2

intersect at

B .

Points

A

and

C

are so chosen on these two lines such that

A B = A C .

The equation of line

A C

passing through

(2, - 7)

HARD

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

2.0 g

sample containing

{MnO}_{2}

is treated with

HCl

liberating

{Cl}_{2}

. The

{Cl}_{2}

gas is passed into a solution of

KI

and

60.0 mL

0.1 {MNaS}_{2} O_{3}

is required to titrate the liberated iodine. The percentage of

{MnO}_{2}

in the sample is____. Nearest integer)
[Atomic masses (in

u

)

Mn = 55; Cl = 35.5 : O = 16, I = 127, Na = 23, K = 39, S = 32

]

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

An ideal gas in a closed container is slowly heated. As its temperature increases, which of the following statements are true ?

(A) the mean free path of the molecules decreases

(B) the mean collision time between the molecules decreases.

(D) the mean collision time remains unchanged.

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

The plot that depicts the behavior of the mean free time

τ

(time between two successive collisions) for the molecules of an ideal gas, as a function of temperature

(T),

qualitatively, is: (Graphs are schematic and not drawn to scale)

EASY

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Given

f (x) = x^{3} - 4 x

, if

x

changes from

2

1.99

, then the approximate change in the value of

f (x)

HARD

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Let

f (x) = 1 + \frac{x}{1!} + \frac{x^{2}}{2!} + \frac{x^{3}}{3!} + \frac{x^{4}}{4!}

. The number of real roots of

f (x) = 0

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

The sum of two forces

\vec{P}

and

\vec{Q}

\vec{R}

such that

|\vec{R}| = |\vec{P}|

. The angle

θ

(in degree) that the resultant of

2 \vec{P}

and

\vec{Q}

will make with

\vec{Q}

is, ________

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

The maximum area of a rectangle inscribed in the circle

{(x + 1)}^{2} + {(y - 3)}^{2} = 64

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

0.01 {MKMnO}_{4}

solution was added to

20.0 mL

0.05 M Mohr

's salt solution through a burette. The initial reading of

50 mL

burette is zero. The volume of

{KMnO}_{4}

solution left in the burette after the end point is.......

mL

. (nearest integer)

HARD

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Let

f (x)

be a polynomial in

x

. Then the second derivative of

f (e^{x})

EASY

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

a + \frac{1}{a} = 8, t h e n a^{3} + \frac{1}{a^{3}} = ?

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Consider two separate ideal gases of electrons and protons having same number of particles. The temperature of both the gases are same. The ratio of the uncertainty in determining the position of an electron to that of a proton is proportional to:

EASY

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

x = \sqrt{3} + \frac{1}{\sqrt{3}}

then

(x - \frac{\sqrt{126}}{\sqrt{42}}) (x - \frac{1}{x - \frac{2 \sqrt{3}}{3}}) =

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Identify the incorrect statement from the following.

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

One mole of an ideal gas passes through a process where pressure and volume obey the relation

P = P_{o} [1 - \frac{1}{2} {(\frac{V_{o}}{V})}^{2}]

. Here

P_{o}

and

V_{o}

are constants. Calculate the change in the temperature of the gas if its volume changes from

V_{o}

2 V_{o}

MEDIUM

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

An ideal gas is enclosed in a cylinder at pressure of

2

atm and temperature,

300 K .

The mean time between two successive collisions is

6 \times 10^{- 8} s .

If the pressure is doubled and temperature is increased to

500 K,

the mean time between two successive collisions will be close to:

HARD

Chemistry>Practical Chemistry>Volumetric Analysis>Lab Activity: Titration of KMnO4 Solution with Mohr's Salt

Given below are two statements:
Statement I: In redox titration, the indicators used are sensitive to change in $pH$ of the solution.
Statement II: In acid-base titration, the indicators used are sensitive to change in oxidation potential.

In the light of the above statements, choose the most appropriate answer from the options given below

Why is it essential to use freshly prepared Mohr's salt solution in the titration of KMnO4 with Mohr's salt?

Important Questions on Volumetric Analysis

Learn and Prepare for any exam you want !

Why is it essential to use freshly prepared Mohr's salt solution in the titration of ${KMnO}_{4}$ with Mohr's salt?