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Assertion SiF(6)^(2-) anion exists but ...

Assertion `SiF_(6)^(2-)` anion exists but `CF_(6)^(2-)` does not
Reasoning Si atom vacnat d-orbital while C-atom has not .

A

If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`

B

If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`

C

If `(A)` is correct but `(R )` is incorrect

D

If `(A)` is incorrect but `(R )` is correct

Text Solution

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The correct Answer is:
A
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SiF_(6)^(2-) exist but not CF_(6)^(2-) explain why ?

Why [BF_(6)]^(2-) ion does not exist?

Knowledge Check

  • [SiF_(6)]^(2-) is known where as [SiCl_(6)]^(2-) not. Reason is

    A
    Six large chloride ions can not be accommo dated around `Si^(4+)` due to limitation of its size.
    B
    Interaction between lone pair of chloride ion and `Si^(4+)` is not very strong.
    C
    Both 1 and 2
    D
    Presence of d-orbitals in chlorine

  • In SiF_(6)^(2-) and SiCl_(6)^(2-). which one exist?

    A
    `SiF_(6)^(2-)` because of small size of F
    B
    `SiF_(6)^(2-)` because of large size of F
    C
    `SiCl_(6)^(2-)` because of small size of Cl
    D
    `SiCl_(6)^(2-)` because of large size of Cl

  • Assertion. SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason. Size of F is small and its lone pair of electrons intract with d-orbitals of Si strongly.

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

    • Similar Questions

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    Assertion (A): ClF _(3) exist but FCl_(3) does not exist. Reason (R): ‘p does not have d-orbitals whereas 'Cl' has d-orbitals.

    Silicon is the second most abundant element (~27.2%) in the earth's after oxygen (45.5 %) Carbon. Silicon, germanium, tin and lead constitute the group 14 of the periodic table. Chemistry of silicon is distinctly different from that of carbon. For example, under standard conditions CO_(2) is a gas whereas SiO_(2) is a covalent solid. Glass, made of SiO_(2),Na_(2)SiO_(3) and CaSiO_(3) is attacked by hydrofluoric acid with formation of SiF_(6)^(2-) anion. The analogous CF_(6)^(2-) anion does not exist. The reason/s is/are : (a)carbon is more electronegative than silicon (b)silicon has larger atomic size than carbon (c)silicon has 3d orbitals which form an sp^(3)d^(2) hybrid orbitals (d)carbon and fluorine have comparable atomic sizes

    Assertion. SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason. Size of F is small and its lone pair of electrons interact with d-orbitals of Si strongly.

    Assertion: SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason: Size of fluorine is small and its lone pair of electrons intersects with d-orbitals of Si strongly.

    Assertion(A) - PCl_5 exists but BiCl_5 does not. Reason(R ) : Bi does not contain d orbitals to expand its octet.

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