Equivalent Ma...

Equivalent Mass

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3 g

of an oxide of a metal is converted to form

5 g

of its chloride. The equivalent weight of the metal is:

$33.25 g$
$45.63 g$
$63.57 g$
$98.81 g$

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Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be

26.89
26.7
8.9
17.8

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$K M n O_{4}$ reacts with ferrous ammonium sulphate according to the equation $M n O_{4}^{-} + 5 F e^{2 +} + 8 H^{+} \to M n^{2 +} + 5 F e^{3 +} + 4 H_{2} O$ , here 10 ml of 0.1 M $K M n O_{4}$ is equivalent to

40 ml of 0.1 M $F e S O_{4}$
50 ml of 0.1 M $F e S O_{4}$
20 ml of 0.1 M $F e S O_{4}$
30 ml of 0.1 M $F e S O_{4}$

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Q. The number of moles of oxalate ions oxidized by one mole of

M n O_{4}^{-}

ion in acidic medium.

$\frac{5}{2}$
$\frac{2}{5}$
$\frac{3}{5}$
$\frac{5}{3}$

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Q. For the reaction,

F e S_{2} + K M n O_{4} + H^{+} \to F e^{3 +} + H_{2} S O_{4} + M n^{2 +} + H_{2} O

.
If the molar mass of

F e S_{2}

is M, then equivalent mass of

F e S_{2}

would be equal to:

$M$
$\frac{M}{10}$
$\frac{M}{11}$
$\frac{M}{15}$

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1.6 g

of calcium and

2.6 g

of zinc when treated with an acid in excess separately produced the same amount of hydrogen gas. Find the equivalent weight of calcium, given zinc has an equivalent weight of

32.6 g

$20 g$
$17 g$
$40 g$
$27 g$

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Q. A solution contains a mixture of

N a_{2} C O_{3}

and

N a O H .

Using phenolphthalein as indicator

35 m L

of mixture required

20 m L

0.80 N H C l

for the end point. With methyl orange,

35 m L

of solution required

37.5 m L

of the same

H C l

for the end point. What is the weight of

N a_{2} C O_{3}

and

N a O H

respectively in the mixture?

$1.484 g, 0.08 g$
$1.5 g, 0.5 g$
$0.08 g, 1.484 g$
$0.5 g, 1.5 g$

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30 m L

of a solution containing

9.15 g m L^{- 1}

of an oxalate

K_{x} H_{y} (C_{2} O_{4})_{z} . n H_{2} O

are required for titrating

27 m L

0.12 N N a O H

and

36 m L

0.12 M K M n O_{4}

separately.
The value of

x + y + z

is:

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What is the n-factor / valency factor of $H_{2} C O_{3}$ ?

1
2
Either a or b
Neither a nor b

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100 m L

\frac{N}{5} N a O H

will neutralize

$0.062 g$ of $H_{3} B O_{3}$
$0.185 g$ of $H_{3} B O_{3}$
$1.24 g$ of $H_{3} B O_{3}$
$0.031 g$ of $H_{3} B O_{3}$

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Q. Equivalent weight of

H_{3} P O_{4}

in each of the reaction will be respectively:

H_{3} P O_{4} + O H^{-} \to H_{2} P O_{4}^{-} + H_{2} O

H_{3} P O_{4} + 2 O H^{-} \to H P O_{4}^{2 -} + 2 H_{2} O

H_{3} P O_{4} + 3 O H^{-} \to P O_{4}^{3 -} + 3 H_{2} O

98, 49, 32.67
49, 98, 32.67
98, 32.67, 49
32.67, 49, 98

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2.16 g

of a metal oxide on strong heating produced

255 mL

of oxygen at STP and the residue obtained was a pure metal. Calculate the equivalent weight of the metal.

$20 g$
$15 g$
$40 g$
$60 g$

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Q. The mass of 98% pure sulphuric acid required for the neutralization of 2 mol of

N a O H

is:
(Molar Mass of S = 32

g m o l^{- 1}

, O = 16

g m o l^{- 1}

and Na = 23

g m o l^{- 1}

)

100 g
98 g
200 g
196 g

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3.2 g

of pyrolusite

(M n O_{2})

was treated with

50 m L

0.5 M

oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to

250 m L

in a flask.

25 m L

of this solution when treated with

0.02 M K M n O_{4}

required

32 m L

of the solution. Find the percentage of

M n O_{2}

in the sample.
Given: Atomic mass of

M n

55 g m o l^{- 1}

$4.5 %$
$11.5 %$
$54.0 %$
$24.4 %$

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0.456 g

of a metal yielded

0.606 g

of its chloride. Calculate the equivalent mass of the metal.

$91 g$
$61 g$
$31 g$
$108 g$

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Q. On heating

0.199 g

of a metallic oxide in a stream of hydrogen,

0.045 g

of water is formed. Find the equivalent weight of the metal.

$61.2 g$
$31.8 g$
$15.5 g$
$12.7 g$

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Q. Find the number of moles of

K M n O_{4}

needed to oxidise one mole

C u_{2} S

in acidic medium. The reaction is

K M n O_{4} + C u_{2} S \to M n^{2 +} + C u^{2 +} + S O_{2}

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Q. What is the equivalent mass of HCl in the given reaction?

2 K M n O_{4} + 16 H C l \to 2 K C l + 2 M n C l_{2} + 5 C l_{2} + 8 H_{2} O

44.2
36.5
58.4
none of these

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What is valency factor of acids in a given reaction?

Number of replaceable $H^{+}$ ions; in the solution
Number of ions of $H^{+}$ in solution
Number of $H^{+}$ ions in one molecule of acid
Number of gram - equivalents

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Q. Consider a redox reaction:

F e S_{2} + K M n O_{4} + H^{+} \to F e^{3 +} + S O_{4}^{2 -} + M n^{2 +} + H_{2} O

.

If the molar mass of

F e S_{2}

is M, then equivalent mass of

F e S_{2}

would be equal to:

$M$
$\frac{M}{5}$
$\frac{M}{10}$
$\frac{M}{15}$

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Q. The percentage by mass of chlorine in the chloride of a metal is

80 %

33.375 g

of this chloride on vaporization occupies a volume of

5.6

litre at STP. Now select the correct options:

Valency of the metal is 2
Molecular weight of the metal chloride is $133.5 u$
Atomic weight of the metal is $27 g$
$9 g$ of the metal can completely react with $8 g$ of oxygen

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$1.5276 g$ of $C d C l_{2}$ was found to contain $0.9367 g$ of $C d$ . Atomic weight of $C d$ is

112.5
122.5
144.5
245

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2.16 g

of a metal oxide on strong heating produced

255 mL

of oxygen at STP and the residue obtained was a pure metal. Calculate the equivalent weight of the metal.

$20 g$
$15 g$
$40 g$
$60 g$

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Q. Potassium acid oxalate

K_{2} C_{2} O_{4} .3 H_{2} C_{2} O_{4} .4 H_{2} O

can be oxidized by

M n O_{4}^{-}

in acidic medium. Calculate the volume of

0.3 M M n O_{4}^{-}

reacting in acid solution with

10.16 g

of the acid oxalate.
(Molar mass of potassium acid oxalate is

508 g m o l^{- 1}

$106.7 m L$
$160.0 m L$
$1.06 L$
$0.16 L$

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M g

can reduce

N O_{3}^{-}

N H_{3}

in basic medium.

N O_{3}^{-} (a q) + M g (s) + H_{2} O \to M g (O H)_{2} (s) + O H^{-} (a q) + N H_{3} (g)

25.0 m L

sample of

N O_{3}^{-}

solution was treated with

M g (s)

. The

N H_{3} (g)

was passed into

100 m L

0.15 N H C l

.
The excess of

H C l

required

32.10 m L

0.10 N N a O H

for neutralization. What was the molarity of

N O_{3}^{-}

ions in the original sample?

$3.025$
$0.5005$
$0.47125$
$0.3025$

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Q. Calculate the mass of

K_{2} C r_{2} O_{7}

required to produce

254 g I_{2}

from

K I

solution.

K_{2} C r_{2} O_{7} + K I \to C r^{3 +} + I_{2}

(Molar mass of

K_{2} C r_{2} O_{7}

294 g m o l^{- 1}

)

$49 g$
$98 g$
$9.8 g$
$49 g$

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1.20 g

sample of

N a_{2} C O_{3}

and

K_{2} C O_{3}

was dissolved in water to form

100 m L

of a solution.

20 m L

of this solution required

40 m L

0.1 N H C l

for complete neutralization. Calculate the weight of precipitate in the mixture if another

20 m L

of this solution is treated with excess of

B a C l_{2}

$0.394 g$
$0.115 g$
$0.596 g$
$0.604 g$

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Q. Find the equivalent weight of

K M n O_{4}

in the given reaction, if the molar mass of

M n O_{4}^{-}

ion is 'M' ?

M n O_{4}^{-} \to M n^{4 +}

(neutral medium)

$22.7$
$12.7$
$32.7$
$52.7$

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Q. Find the equivalent weight of thiosulphate ion from the following reaction:

2 S_{2} O_{3}^{2 -} (R e d u c i n g a g e n t) \to S_{4} O_{6}^{2 -} + 2 e^{-}

M
2M
$\frac{M}{2}$
3M

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3.2 g

of pyrolusite

(M n O_{2})

was treated with

50 m L

0.5 M

oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to

250 m L

in a flask.

25 m L

of this solution when treated with

0.02 M K M n O_{4}

required

32 m L

of the solution. Find the percentage of

M n O_{2}

in the sample.
Given: Atomic mass of

M n

55 g m o l^{- 1}

$4.5 %$
$24.4 %$
$54.0 %$
$11.5 %$

View Solution