In aqueous solution, Li+ ion has lowest mobility. Why? from C

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The s-Block Elements

Short Answer Type

1. What are s-block elements?

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2.

Why are alkali metals not found in nature?

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3.

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

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4.

What is the nature of lithium compounds?

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5.

Group 1 elements are called alkali metals. Why?

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6.

Why caesium can be used in photoelectric cell while lithium can not be?

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7.
In aqueous solution, Li⁺ ion has lowest mobility. Why?

Due to very small size, Li⁺ ion is heavily hydrated (than those of M⁺ ions of the rest of the group), so its mobility is lowest.

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8.

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

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9.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

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10.

Which is the most reactive alkali metal and why?

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