Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 5

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Average atomic mass of Magnesium is 24.31 amu. This magnesium is composed of 79 mole $%$ of $^{24} Mg$ and remaining 21 mole $%$ of ${}^{25}{Mg}$ and ${}^{26}{Mg}$ . Calculate the mole $%$ of ${}^{26}{Mg}$ .

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Important Questions on Some Basic Concepts of Chemistry

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 6

How many grams are contained in

1

gram-atom of

Na

?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 7

An element has three isotopes with masses of

24, 25

and

26

with relative abundance of

80 %, 15 %

and

5 %

, respectively. The average mass of the isotope mixture would be

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 8

The molar ratio of

{Fe}^{2 +}

to

{Fe}^{3 +}

in a mixture of

{FeSO}_{4}

and

{Fe}_{2} {({SO}_{4})}_{3}

having equal number of sulphate ion in both ferrous and ferric sulphate is

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 9

1.00 g

of a pure element contains

4.39 \times 10^{21}

atoms. The element is

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 10

The number of neutrons in

5 g

of

D_{2} O (D {is}_{1}^{2} H)

are:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 11

If, from

10

moles of

{NH}_{3}

and

5

moles of

H_{2} {SO}_{4},

all the

H

-atoms are removed in order to form

H_{2}

gas, then find the number of

H_{2}

molecules formed is

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 12

The atomic weights of two elements

A

and

B

are

40 u

and

80 u

, respectively. If

x

g

of

A

contains

y

atoms, how many atoms are present in

2 x g

of

B

?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 13

Four

1 - 1

litre flasks are separately filled with the gases

H_{2}, He, O_{2}

and

O_{3}

at the same temperature and pressure. The ratio of total number of atoms of these gases present in different flask would be: