Question

The metal which forms hydrogen bond after the reaction with the acid with an alkali

Answer 1

Reactions of Alkali Metals

The elements of 1st A group of the periodic table are called as the Alkali metals. These are called alkali metals because the oxides of these bases are alkali, that is, their bases are soluble in water.

Below are the following alkali metals:Li (3), Na (11), K (19), Rb (37), Cs (55), Fr (87)Electronic configuration of alkali metals: The outermost shell of these metals has 1 electron and penultimate shell contains 8 electrons except the first member Li.  

The electronic configurations of these elements are given below:Li (3): 1s2 2s1Na (11): 1s2 2s2 2p6 3s1K (19): 1s2 2s2 2p6 3s2 3p6 4s1Rb (37): 1s2 2s2 2p6 3s2 3p6 4s2 3d 104p6 5s1Cs (55): 1s2 2s2 2p6 3s2 3p6 4s2 3d 104p6 5s2 4d10 5p6 6s1Fr (87): 1s2 2s2 2p6 3s2 3p6 4s2 3d 104p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s1  

Chemical Reactions of Alkali Metals:Reaction with airThese metals react with oxygen readily and form different oxides, the tendency to form oxides increases from lithium to franciumM → M2O → MOH → M2CO3↓M2O2The oxides react with moisture in the atmosphere and forms hydroxide which further picks up the CO2 from the atmosphere and forms metal carbonate.  

This is the reason why they are kept in Kerosene. Some of the important properties of alkali metals areReaction with water: They readily react with water to decompose it and hydrogen gas is evolved in the process. They form soluble hydroxides2M +H2O → 2MOH + H2Reactions with halogens: They react with halogens to form halides according to following reaction:M +Cl2 → MCl2With the exception of lithium halides, the halides of alkali Metals are ionic in nature.

Reducing nature:The alkali metals are very strong reducing agents, their reduction potentials are very low and they decrease from lithium to Cesium, the Cesium is the most electropositive element in the periodic table, it is for this reason that the alkali metals cannot be obtained by the electrolysis of their aqueous solution.M → M+ +e-Reactions with sulfur and phosphorous: The alkali metals directly react with sulfur and phosphorous to form sulfides and phosphides, these compounds are also soluble in water.