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Assertion (A): Alkali metals impart colo...

Assertion (A): Alkali metals impart colour to the flame.
Reason (R ): The ionisation energies are low.

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 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

Verified by Experts

The correct Answer is:
a
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Why alkali metals impart colour to the flame ?

The metal ions impart colour of the flame due to:

Knowledge Check

  • Assertion (A): Alkali metlas impart colour to the flame. Reason (R ): The ionisation energies are low.

    A
    If both (A) and (R ) are correct and (R ) is the correct explanation of (A).
    B
    If both (A) and (R ) are correct, but (R ) is not the correct explanation of (A).
    C
    If (A) is correct, but (R ) is incorrect.
    D
    If (A) is incorrect, but (R ) is correct.

  • Alkali metals impart colour to Bunsen flame due to

    A
    low ionization energies
    B
    low melting points
    C
    their softness
    D
    the presence of one electron in the most shell

  • The metal ions impart colour of the flame due to:

    A
    Frenkel defect
    B
    Metal excess defect
    C
    metal deficiency defect
    D
    Schottky defect

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    Alkali metals give colour in bunsen flame due to-

    Assertion (A): Be and Mg impart characterstic colour to the flame. Reason (R ): As compared to other alkaline earth metals, ionisation enthalpy of Be and Mg is low.

    Assertion : Alkali metal salts give colour to the Bunsen flame . Reasoning : This is due to excitation of valence shell electrons of sodium ions from lower to higher orbitals

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