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Assertion: The average mass of one Mg at...

Assertion: The average mass of one Mg atom is `24.305 amu`, which is not actual mass of one Mg atom.
Reason: Three isotopes, `24 Mg, 25 Mg and 26 Mg`, of Mg are found in nature.

A

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

(b)If both assertion and reason are true and the reason is not the correct explanation of the assertion.

C

(c )If assertion is true but reason is false.

D

(d)If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • Calculate the mass in gm of 2g atom of Mg-

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    A
    5
    B
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    C
    10
    D
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    In a periodic table, the average atomic mass of magnesium is given as 24,312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are " "_(12)^(24)Mg (23.98504 u), " "_(12)^(25)Mg (24.98584 u) and " "_(12)^(26)Mg (25.98259 u). The natural abundance of " "_(12)^(24)Mg is 78.99% by mass. Calculate the abundances of the other two isotopes.

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