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Q.

The number of alkali metals known so far is

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a

7

b

6

c

4

d

5

answer is C.

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Detailed Solution

The alkali metals are six chemical elements in Group 1, the leftmost column in the periodic table. They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

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