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Standard IX

Chemistry

Atomic Number

Assertion :Th...

Question

Assertion :The nucleus $_{Z}^{A} X$ is having atomic mass as well as its mass number as $A .$ Reason: Mass number of an element is an integer that specifies an isotope and has no units, while atomic mass is generally not an integer.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
$A$ - Mass No. = no. of Neutrons + no. of protons (integer)
While Atomic mass = Mass of neutrons + mass of protons+ mass of electrons
(not integer )

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Similar questions

Assertion: The mass of Chlorine is 35.5 u

Reason: For elements having isotopes, the average of mass of its isotopes is considered as the atomic mass of that element.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

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Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :The nucleus AZX is having atomic mass as well as its mass number as A. Reason: Mass number of an element is an integer that specifies an isotope and has no units, while atomic mass is generally not an integer.

The correct option is D Assertion is incorrect but Reason is correctA- Mass No. = no. of Neutrons + no. of protons (integer)While Atomic mass = Mass of neutrons + mass of protons+ mass of electrons (not integer )

Assertion :The nucleus $_{Z}^{A} X$ is having atomic mass as well as its mass number as $A .$ Reason: Mass number of an element is an integer that specifies an isotope and has no units, while atomic mass is generally not an integer.

The correct option is D Assertion is incorrect but Reason is correct
$A$ - Mass No. = no. of Neutrons + no. of protons (integer)
While Atomic mass = Mass of neutrons + mass of protons+ mass of electrons
(not integer )