Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 17

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A pure gas that is $14.3 %$ hydrogen and $85.7 %$ carbon by mass has a density of $2.5 g L^{- 1}$ at $0 ° C$ and $1$ atm pressure. What is the molecular formula of the gas :

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Important Questions on Some Basic Concepts of Chemistry

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 18

A certain alkaloid has

70.8 %

carbon,

6.2 %

hydrogen,

4.1 %

nitrogen and the rest oxygen. What is its empirical formula :

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 19

The empirical formula of a compound of molecular mass

120

is

{CH}_{2} O

. The molecular formula of the compound is:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 20

0.250 g

of an element

M,

reacts with excess fluorine to produce

0.547 g

of the hexafluoride

{MF}_{6} .

What is the element :

[Cr = 52, Mo = 96, S = 32, Te = 127.6]

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 21

A

1000

gram sample of

NaOH

contains

3

moles of

O

atoms, what is the

%

purity of

NaOH

:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 22

A

15 mL

sample of

0.20 M {MgCl}_{2}

is added to

45 mL

of

0.40 M {AlCl}_{3},

What is the molarity of

Cl

ions in the final solution:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 23

Mole fraction of ethanol in ethanol and water mixture is

0.25 .

Hence percentage concentration of ethanol by weight of mixture is :

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 24

How many moles of

{Na}^{+}

ions are in

20 mL

of

0.40 M {Na}_{3} {PO}_{4} :

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-1>Q 25

The molality of a

1 L

solution with

x % (\frac{w}{w}) H_{2} {SO}_{4}

is

9 .

The weight of solvent present in the solution is

910

grams. The value of

x

is :