Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 4

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$29.2 % (w / w) HCl$ stock solution has a density of $1.25 g {mL}^{- 1}$ . The molecular weight of $HCl$ is $36.5 g {mol}^{- 1}$ . What is the volume $(mL)$ solution of $200 mL$ solution of $0.4 M HCl$ ?

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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-3>Q 5

The mole fraction of a solute in a solution is

0.1

. At

298 K

, molarity of this solution is the same as its molality. The density of this solution at

298 K

is

2.0 g {cm}^{- 3}

. The ratio of the molecular weights of the solute and solvent,

(\frac{M W_{s o l u t e}}{M W_{s o l v e n t}})

, is

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 6

The organic compound has the molar mass $108 g mol {}^{- 1}.$ The $C, H$ and $N$ atoms are present in the ratio of $9 : 1 : 3.5$ by weight. What is the molecular formula of organic compound?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 7

What volume of hydrogen gas at $273 K$ and $1 atm$ pressure will be consumed in obtaining $21.6 g$ of elemental boron (atomic mass $= 10.8$ ) from the reduction of boron trichloride by hydrogen?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 8

6.02 \times 10^{20}

molecules of urea are present in

100 ml

of its solution. The concentration of urea solution is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 9

Two solutions of a substance (non electrolyte) are mixed in the following manner.

480 ml

of

1.5 M

first solution

+ 520 ml

of

1.2 M

second solution. What is the molarity of the final mixture?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 10

How many moles of magnesium phosphate,

Mg {({PO}_{4})}_{2}

will contain

0.25

mole of oxygen atoms?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 11

Density of a

2.05 M

solution of acetic acid in water is

1.02 g / ml

. What is the molality of the solution?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 12

In the reaction,

$2 {Al}_{(s)} + 6 {HCl}_{(aq)} ⟶ 2 A_{(aq)}^{3 +} + 6 {CΓ}_{(aq)} + 3 H_{2} (g)$ .

Among the given statements, which is the true statement ?