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

EASY

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For any redox reaction, the valency factor is equal to .

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Important Questions on Basic Concepts of Chemistry and Chemical Calculations

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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)

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

The number of electron required to reduce chromium completely in

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

C r^{3 +}

in acidic medium, is

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

The number of moles of electron required to reduce

0.2

mole of

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

{Cr}^{+ 3}

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

A fuel cell generates electricity by using methanol as fuel and

O_{2}

as the oxidant. Calculate the equivalent weight of methanol.

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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:

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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:

HARD

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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

{CO}_{2}

is:

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

In the reaction,

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

the equivalent mass of

Al {(OH)}_{3}

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

Determine the equivalent weight of

N a_{2} S O_{4}

, if formula weight of this compound is

X

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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?

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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

HARD

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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

Chemistry>Physical Chemistry>Basic Concepts of Chemistry and Chemical Calculations>Gram Equivalent Concept

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

For any redox reaction, the valency factor is equal to .

Important Questions on Basic Concepts of Chemistry and Chemical Calculations

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