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Standard XII

Chemistry

Laws of Definite Proportions, Multiple Proportions

Assertion :Ma...

Question

Assertion :Mass numbers of most of the elements are fractional. Reason: Mass numbers are obtained by comparing with the mass number of carbon taken as $12$ .

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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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Mass numbers are almost never fractional.
Mass numbers can be obtained by adding $N_{p}$ and $N_{n}$ .
Thus both assertion and reason is false.

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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: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

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to form slag.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(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 :Mass numbers of most of the elements are fractional. Reason: Mass numbers are obtained by comparing with the mass number of carbon taken as 12.

The correct option is D Both Assertion and Reason are incorrectMass numbers are almost never fractional.Mass numbers can be obtained by adding Np and Nn.Thus both assertion and reason is false.

Assertion :Mass numbers of most of the elements are fractional. Reason: Mass numbers are obtained by comparing with the mass number of carbon taken as $12$ .

The correct option is D Both Assertion and Reason are incorrect
Mass numbers are almost never fractional.
Mass numbers can be obtained by adding $N_{p}$ and $N_{n}$ .
Thus both assertion and reason is false.