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The formula mass of Mohr's salt is 392. The iron present in it is oxidised by ${K M n O}_{4}$ in acid medium. The equivalent mass of Mohr's salt is

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Important Questions on Some Basic Concepts of Chemistry

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Which symbol replaced the unit of atomic mass, amu?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

0.45 g

acid of molecular mass

90

was neutralise by

20

ml

0.5 N KOH

. The basicity of the acid is

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

When

10 mL

of an aqueous solution of

{Fe}^{2 +}

ions was titrated in the presence of dil

H_{2} {SO}_{4}

using diphenylamine indicator,

15 mL

0.02 M

solution of

K_{2} {Cr}_{2} O_{7}

was required to get the end point. The molarity of the solution containing

{Fe}^{2 +}

ions is

x \times 10^{- 2} M

. The value of

x

is ______. (Nearest integer)

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

The unit of atomic mass,

amu

is replaced by

u

, here

u

stands for

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Complete reaction of 2.0 g of calcium (at wt. = 40) with excess

H C l

produces

1.125 L o f H_{2}

gas. Complete reaction of the same quantity of another metal "M" with excess

H C l

produces

1.85 L o f H_{2}

gas under identical conditions. The equivalent weight of "M" is closest to:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

One mole of dioxygen gas at

STP

is equal to

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

A fuel cell generates electricity by using methanol as fuel and

O_{2}

as the oxidant. Calculate the equivalent weight of methanol.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Two elements

A

and

B

which form

0.15

moles of

A_{2} B

and

{AB}_{3}

type compounds. If one mole of each

A_{2} B

and

{AB}_{3}

weigh equally, then the atomic weight of

A

is____times of atomic weight of

B

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

In order to oxidize a mixture of one mole of each of

F e C_{2} O_{4}, F e_{2} {(C_{2} O_{4})}_{3}, F e S O_{4}

and

F e_{2} {(S O_{4})}_{3}

in acidic medium, the number of moles of

K M n O_{4}

is:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

The number of moles of electron required to reduce

0.2

mole of

{Cr}_{2} O_{7}^{- 2}

{Cr}^{+ 3}

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

What will be the mass of one atom of

{}^{12}C

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

1 mol

F e S O_{4}

(a t o m i c w e i g h t o f F e i s 55.84 g m o l^{- 1})

is oxidized to

F e_{2} {(S O_{4})}_{3}

. Calculate the equivalent weight of ferrous ion

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Calculate mass of

3.01 \times 10^{24}

atoms of an element having atomic mass

21.13

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

The average molar mass of chlorine is

35.5 g {mol}^{- 1}

. The ratio of

{}^{35}{Cl}

{}^{37}{Cl}

in naturally occurring chlorine is close to :

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

3 g

of acetic acid is added to

250 m L

0.1 M H C l

and the solution made up to

500 m L

. To

20 m L

of this solution

\frac{1}{2} m L

5 M N a O H

is added. The

p H

of the solution is ________
[Given:

p K a

of acetic acid

= 4.75,

molar mass of acetic acid

60 g / m o l, \log 3 = 0.4771

, Neglect any changes in volume]

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Consider an imaginary ion

{}_{22}^{48}X^{3 -}

. The nucleus contains '

a

%

more neutrons than the number of electrons in the ion. The value of '

a

' is

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

4 g

of copper was dissolved in

conc . {HNO}_{3}

. The copper nitrate thus obtained gave

5 g

of its oxide on strong heating the equivalent weight of copper is

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

The number of electron required to reduce chromium completely in

{Cr}_{2} O_{7}^{2 -}

C r^{3 +}

in acidic medium, is

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of

{CO}_{2}

is:

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

A mixture of ${Cu}_{2} S$ and $CuS$ on oxidation by $Al {({MnO}_{4})}_{3}$ in acidic medium gives ${Cu}^{2 +}$ and ${SO}_{2}$ . If molar masses of ${Cu}_{2} S, CuS$ and $Al {({MnO}_{4})}_{3}$ are $M_{1}, M_{2}$ and $M_{3}$ , respectively, then for this reaction which one are correct?

The formula mass of Mohr's salt is 392. The iron present in it is oxidised by KMnO4 in acid medium. The equivalent mass of Mohr's salt is

Important Questions on Some Basic Concepts of Chemistry

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The formula mass of Mohr's salt is 392. The iron present in it is oxidised by ${K M n O}_{4}$ in acid medium. The equivalent mass of Mohr's salt is