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Methods of expressing co..



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Q1. Which of the following concentration determine techniques gives a more accurate value?

(a) Molarity
(b) Molality
(c) Formality
(d) Normality

Q2. Calculate the mole fraction of A if 25g of it is dissolved in 50 moles of B. Given the molar mass of A is 25 g/mole.

(a) 0.0196
(b) 0.5
(c) 0.3333
(d) 0.9259

Q3. Calculate the volume (mL) of concentrated acid required to prepare 500 mL of 0.25 N HCl solution from concentrated stock HCl solution (specific gravity = 1.19) and 37.2% (by mass).

(a) 12.128 mL
(b) 20.613 mL
(c) 10.307 mL
(d) 24.256 mL

Q4. What is the molarity of a 15 ml, 2 M aqueous solution when 285 ml of water is added to it?

(a) 0.400 M
(b) 0.100 M
(c) 0.111 M
(d) 0.105 M

Q5. What is the molality of a dilute aqueous 0.02 N H3PO4 solution?

(a) 0.005
(b) 0.02
(c) 0.0033
(d) 0.0067

Q6. Consider 100 ml of 0.3 molar solution formed by dissolving 3.33g of XCl2 in water. What is the molar mass of element X? (Atomic mass of Cl = 35.5)

(a) 9
(b) 24
(c) 40
(d) 87

Q7. Iron (III) oxide chunks contain 80 ppm silica (SiO2). What is the concentration of this impurity in mass%?

(a) 0.01%
(b) 0.08%
(c) 0.80%
(d) 8.00%

Q8. If a urea (NH2CONH2) contains 45% (by mass) N2, what is the actual urea content in the sample?

(a) 103.7 kg
(b) 96.4 kg
(c) 9.65 kg
(d) 10.4 kg

Q9. What is the mole fraction of glycerin C3H5(OH)3 in a solution containing 33g of glycerin, 60g isopropyl alcohol and rest water?

(a) 0.359
(b) 0.258
(c) 0.205
(d) 0.48

Q10. What is the normality of lead (II) nitrate if the density of its 26% (w/w) aqueous solution is 3.105 g/mL? Take molar mass of lead (II) nitrate to be 331g/mol.

(a) 2.437 N
(b) 4.878 N
(c) 0.243 N
(d) 0.488 N


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794 views

The Statement "If 0.003 Moles Of A Gas Are Dissolved In 900 G Of Water Under A Pressure Of 1 Atmosphere, 0.006 Moles Will Be Dissolved Under A Pressure Of 2 Atmosphere", Illustrates

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258 Year Ago

The Statement "If 0.003 Moles Of A Gas Are Dissolved In 900 G Of Water Under A Pressure Of 1 Atmosphere, 0.006 Moles Will Be Dissolved Under A Pressure Of 2 Atmosphere", Illustrates

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781 views

If 1 M And 2.5 Litre NaOH Solution Is Mixed With Another 0.5 M And 3 Litre NaOH Solution, Then Molarity Of The Resultant Solution Will Be

Modified 258 Year Ago

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258 Year Ago

If 1 M And 2.5 Litre NaOH Solution Is Mixed With Another 0.5 M And 3 Litre NaOH Solution, Then Molarity Of The Resultant Solution Will Be

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678 views

The Solubility Of A Gas In Water Depends On

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The Solubility Of A Gas In Water Depends On

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When 7.1gm Na2SO4 (molecular Mass 142) Dissolved In 100ml H2O, The Molarity Of The Solution Is

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258 Year Ago

When 7.1gm Na2SO4 (molecular Mass 142) Dissolved In 100ml H2O, The Molarity Of The Solution Is

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582 views

Molarity Of A Given Orthophosphoric Acid Solution Is 3 M. Its Normality Is

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19 Year Ago

Molarity Of A Given Orthophosphoric Acid Solution Is 3 M. Its Normality Is

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565 views

The Volume Strength Of 1.5 N H2O2 Solution Is

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258 Year Ago

The Volume Strength Of 1.5 N H2O2 Solution Is

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521 views

What Is Molarity Of A Solution Of HCL Which Contains 49% By Weight Of Solute And Whose Specific Gravity Is 1.41

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What Is Molarity Of A Solution Of HCL Which Contains 49% By Weight Of Solute And Whose Specific Gravity Is 1.41

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