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An element occupies group number 1 and p...

An element occupies group number 1 and period number 3. This element heated in air gives compound A. With water it gives compound B - a strong base. With ammonia gives compound C, which is used as a reducing agent in organic chemistry. Identify the element A,B and C.

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(i) As per the position in the periodic table this element occupying group number 1 and period number 3 is sodium. (ii) When heated in air, it forms sodium peroxide (A)
`4 Na +O_2 rArr 2 Na_2O_2`
(iii) With water, sodium gives sodium hydroxide (B)
`2Na +2H_2O rArr 2NaOH +H_2`
(iv) With ammonia, sodium gives sodamide (I)
`2Na + 2NH_(3) overset(570-670 K)rarr 2 NaNH_2 +H_2`
The element is sodium.
The compound A is sodium peroxide.
The compound B is sodium hydroxide.
The compound C is sodamide.
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