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Assertion: Helium and beryllium have sim...

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

A

If both Assertion (A) and (R ) are correct and Reason (R ) is the correct explanation of Assertion (A).

B

If both (A) and (R ) are correct but (R ) is not the correct explanation for (A).

C

If (A) is correct but (R ) is not correct.

D

If (A) and (R ) are correct

Text Solution

Verified by Experts

The correct Answer is:
C
Correct reasong: Although `He` and `Be` have similar outer electronic configuration `(ns^(2))`, only `He(1s^(2))` has inert gas configuration and hence is chemically inert.
But `Be(2s^(2))` does not have inert gas configuration and hence is not chemically inert
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Knowledge Check

  • 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

  • Assertion: Helium and beryllium have similar outer electronic configuration. Reason: Both are chemically inert.

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

  • The alkali metals have an outer electronic configuration of

    A
    `ns^(2)`
    B
    `ns^(2)np^(2)`
    C
    `ns^(1)`
    D
    `ns^(2)np^(1)`.

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