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Assertion (A): Alkaline earth metals are...

Assertion (A): Alkaline earth metals are harder than alkali meatals.
Reason (R ): Atomic radii of alkaline earth metas are smaller thant the corresponding alkali metals in the same period.

A

If both assertion and reason are true and the reason is the correct explanation of assertion

B

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

C

If assertion is false but reason is true

D

If assertion is true but the reason is false

Text Solution

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The correct Answer is:
D
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The atomic radii of alkaline earth metals are smaller than those of the corresponding alkali metals. Explain, why?

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(a) Why alkaline earth metals are harder, have higer melting ponts and higher densities than the alkali metals? (b). Why the atoms of alkaline earth metals are smaller than the corresponding alkali metals? (c ). Why alkaline earth metals have high electrical and thermal conductivities? (d). What is black ash? (e). Why the variation in physical properties of alkaline earth elements is not as regular as in the case of alkali metals?

Why are the second ionisation energies of alkaline earth metals much smaller than those of alkali metals ?

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