Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 43

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In a gravimetric determination of $P$ , an aqueous solution of dihydrogen phosphate ion $H_{2} {PO}_{4}^{-}$ is treated with a mixture of ammonium and magnesium ions to precipitate magnesium ammonium phosphate, $Mg ({NH}_{4}) {PO}_{4} \cdot {GH}_{2} O .$ This is heated and decomposed to magnesium pyrophosphate, ${Mg}_{2} P_{2} O_{7},$ which is
weighed. A solution of $H_{2} {PO}_{4}^{-}$ yielded $1.054 g$ of ${Mg}_{2} P_{2} O_{7} .$ What weight of ${NaH}_{2} {PO}_{4}$ was present originally ?

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Important Questions on Some Basic Concepts of Chemistry

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 44

10 g

of a sample of a mixture of

{CaCl}_{2}

and

NaCl

is treated to precipitate all the calcium as

{CaCO}_{3}

. This

{CaCO}_{3}

is heated to convert all the

Ca

to

CaO

and the final mass of

CaO

is

1.62 g

. The percent by mass of

{CaCl}_{2}

in the original mixture is.

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 45

$500 mL$ of a glucose solution contains $6.02 \times 10^{22}$ molecules. The concentration of the solution is;

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 46

Equal moles of

H_{2} O

and

NaCl

are present in a solution. Hence, molality of

NaCl

solution is

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 47

Decreasing order of mass of pure

NaOH

in each of the aqueous solution.
(I)

50 g

of

40 % (W / W) NaOH

(II)

50 ml

of

50 % (W / V) NaOH (d_{sol} = 1.2 g / ml)

(III)

50 g

of

15 M NaOH (d_{sol} = 1 g / ml)

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 48

Mole fraction of

A

in

H_{2} O

is

0.2 .

The molality of

A

in

H_{2} O

is :

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 49

What is the molarity of

H_{2} {SO}_{4}

solution that has a density of

1.84 g / cc

and contains

98 %

by mass of

H_{2} {SO}_{4}

? (Given atomic mass of

S = 32

)

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 50

The molarity of the solution containing

2.8 %

( mass/volume) solution of

KOH

is: (Given atomic mass of

K = 39

)

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 51

A solution of

{FeCl}_{3}

is

\frac{M}{30}

. Molarity for

{Cl}^{-}

ion will be: