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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

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The correct Answer is:
a
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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
    • PRADEEP-S-BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) -Assertion -Reason Type Question (Type 2)
    1. Assertion (A): Alkali metals impart colour to the flame. Reason (R )...

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    2. Assertion (A): Sodium reacts with oxygen to form Na(2)O(2) whereas pot...

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    3. Assertion . K , Rb and Cs form superoxides . Reason . The stability ...

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    4. Statement I LiCl is predomionantly a covalent compound. Statement II...

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    5. Assertion (A): The mobility of Na^(o+) is lower than that of K^(o+) io...

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    6. Assertion . Among the alkali metals , lithium salts exhibit the least ...

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    7. Assertion . Li resembles Mg. Reason . Li^(+) has approximately the s...

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    8. Assertion (A): Na(2)CO(3) and Li(2)CO(3) are thermally stable. Reaso...

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    9. Assertion . Potassium carbonate cannot be manufactured by a process s...

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    10. Assertion (A): In rainy season, common salt becomes damp after sometim...

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    11. Assertion . In the electrolysis of aqueous NaCl , Na is preferentially...

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    12. Assertion (A): magnesium keeps on burning in CO(2). Reason (R ): Mag...

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    13. Assertion (A): Calcium and magnesium oxides are not reduced by carbon....

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    14. Assertion . CaF(2) has been given the name fluorspar . Reason. Soli...

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    15. Assertion (A): Na(2)SO(4) is soluble in water while BaSO(4) is insolub...

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    16. Assertion (A): Sulphur is estimates as BaSO(4) and not as MgSO(4). R...

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    17. Assertion Bleaching powder is a mixed salt. Reason In the presence o...

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    18. Assertion (A): Magnesium can be obtained by the electronlysis of aqueo...

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    19. Assertion (A): magnesium is not present in enamel of human teeth. Re...

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