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In each of the following questions a...

In each of the following questions a Statement of Assertion (A ) is given followed by a corresponding statement of Reason (R ) Just below it . Of the statement mark the correct answer as
Assertion .Helium and beryllim have similar outer electronic configuration of the type `ns^(2)`
Reason . both are chemcially inert .

A

Statement -1 is True Statement -2 is True , Statement -2 is correct explanation for Statement -5

B

If both assertion and reason are true but reason is not the true explanation of the assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the Assertion (A) and Reason (R) statements about Helium and Beryllium, we can follow these steps: ### Step 1: Analyze the Assertion The assertion states that "Helium and Beryllium have similar outer electronic configuration of the type `ns^(2)`." - Helium (He) has an electronic configuration of `1s^2`, which means it has 2 electrons in its outermost shell (the first shell). - Beryllium (Be) has an electronic configuration of `1s^2 2s^2`, meaning it has 2 electrons in the first shell and 2 electrons in the second shell. **Conclusion for Step 1**: The assertion is partially true because while both have a filled outer shell, their configurations are not exactly the same. Helium is `1s^2` and Beryllium is `2s^2` (not `ns^2` in the same shell). ### Step 2: Analyze the Reason The reason states that "both are chemically inert." - Helium is a noble gas and is chemically inert, meaning it does not readily react with other elements. - Beryllium, on the other hand, is not chemically inert. It can react with other elements and form compounds, such as beryllium oxide and beryllium chloride. **Conclusion for Step 2**: The reason is false because Beryllium is not chemically inert. ### Step 3: Determine the Relationship Now we need to determine the relationship between the assertion and the reason. - The assertion is true in terms of electronic configuration type but not in the same context as both being `ns^2`. - The reason is false because Beryllium is not chemically inert. ### Final Conclusion Since the assertion is true but the reason is false, the correct answer is that the Assertion is true, but the Reason is false. ### Answer: **Option 3**: Assertion is true, Reason is false. ---
To solve the question regarding the Assertion (A) and Reason (R) statements about Helium and Beryllium, we can follow these steps: ### Step 1: Analyze the Assertion The assertion states that "Helium and Beryllium have similar outer electronic configuration of the type `ns^(2)`." - Helium (He) has an electronic configuration of `1s^2`, which means it has 2 electrons in its outermost shell (the first shell). - Beryllium (Be) has an electronic configuration of `1s^2 2s^2`, meaning it has 2 electrons in the first shell and 2 electrons in the second shell. ...
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Knowledge Check

  • Assertion: Helium and beryllium have similar outer electronic configuration of the type ns^(2) . Reason: Both are chemically inert.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If the assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

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    A
    Both Assertion and Reason is the correct explanation of Assertion
    B
    Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
    C
    Assertion is true but Reason is false
    D
    Both Assertion and Reason are false

  • In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it of the statements mark the correct answer as Assertion(A): Cell wall is not found in plant cell Reason:Animal cells are covered by cell wall

    A
    Both Assertion and Reason is the correct explanation of Assertion
    B
    Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
    C
    Assertion is true but Reason is false
    D
    Both Assertion and Reason are false