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.

An element occupies group number 1 and period number 3. This element h

1.	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.
Answer» Solution :(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.