A mixture of n 1 moles of Na 2 C 2 O 4 and n 2 moles of NaHC 2 O 4 is titrated separately with H 2 O 2 and KOH, to reach at equivalence point. Which of the following statement is/are correct?

n-factor of Na 2 C 2 O 4 with H 2 O 2 and KOH, respectively, are 2 and 0

Moles of H 2 O 2 and KOH are n 1 + n 2 2 and n 1

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The molecular weight and equivalent weight of potassium hydroxide is same.

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Important Questions on Some Basic Concepts of Chemistry

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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

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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>Chemical Equivalents

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)

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The number of electron required to reduce chromium completely in

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

C r^{3 +}

in acidic medium, is

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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

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The number of moles of electron required to reduce

0.2

mole of

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

{Cr}^{+ 3}

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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>Chemical Equivalents

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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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:

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

{CO}_{2}

is:

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In the reaction,

NaOH + Al {(OH)}_{3} \to {NaAlO}_{2} + H_{2} O

the equivalent mass of

Al {(OH)}_{3}

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8 g

of a metal hydroxide on heating produces

5 g

metal oxide. If the atomic mass of the metal is

7

, then the formula of its chloride is

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Which of the following statement(s) is/are correct for the following reaction?

{As}_{2} S_{5} + {NO}_{3}^{-} ⟶ As O_{4}^{3 -} + {NO}_{2} + {SO}_{4}^{2 -}

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Chemical Equivalents

Determine the equivalent weight of

N a_{2} S O_{4}

, if formula weight of this compound is

X

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In the following reaction, ${As}_{2} S_{3} + H^{+} + {NO}_{3}^{-} \to NO + H_{2} O + {AsO}_{4}^{3 -} + {SO}_{4}^{2 -}$ , the equivalent weight of As₂S₃ is related to molecular weight by

HARD

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A mixture of n₁ moles of Na₂C₂O₄and n₂ moles of NaHC₂O₄ is titrated separately with H₂O₂ and KOH, to reach at equivalence point. Which of the following statement is/are correct?

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A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Chemical Equivalents

An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is

20 %

by weight?

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Chemical Equivalents

When dissolved in dilute

H_{2} S O_{4}, 0.275 g

of metal evolved

119.7 m L o f H_{2} a t 20^{o} C

and

780.4 m m

pressure.

H_{2}

was collected over water. Aqueous tension is

17.4 m m

20^{o} C

. Calculate equivalent weight of metal.

EASY

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In acidic medium, dichromatic ion oxidises ferrous ion to 'ferric ion. If the gram molecular weight of potassium dichromate is294g, its gram equivalent weight (in grams) is

The molecular weight and equivalent weight of potassium hydroxide is same.

Important Questions on Some Basic Concepts of Chemistry

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