Explanation
This is a fact.
Hydrogen form molecular compounds with p-block elements (B, C, N, O, F; Si, P, S, Cl; Ga, Ge, As, Sb, Br; In, Sn, Sb, Te, I; Tl, Pb, At). Molecular hydrides are classified as electron rich, electron precise and electron deficient hydrides. (a) Electron rich molecular hydrides: These hydrides have one or more lone pairs of electrons around the central more electronegative element. (b) Electron precise molecular hydrides: Elements of group 14 form such hydrides. The bond length increases on going down the group. A common example of electron precise molecular hydrides is CH4. (c) Electron deficient molecular hydrides: These hydrides have lesser number of electrons than that required for writing the conventional Lewis structure. A common example of such molecular hydride is diborane, B2H6. (d) Systematic names of molecular hydrides: The systematic names of these hydrides are obtained from the name of the element and the suffix –ane.
BH3 exists as a dimeric form of B2H6 as BH3 is covalently combined with another BH3 molecule to form B2H6 which contain 3 centre 2electron bonds. Thus B2H6 is electron deficient covalent hydride.
Clark’s process involves the addition of a controlled quantity of slaked line (calicium hydroxide)
Ca(HCO3)2(aq) + Ca(OH)2 (aq) → 2CaCO3(s) + 2H2O(l)
Mg(HCO3)2(aq) + Ca(OH)2(aq) → CaCO3(s) + MgCO3(s)+2H2O(l)
Slaked line is itself a source of calcium ions (and hence hardness), So care must be taken to avoid adding an excess
Ka of H2O2 = 10–12 and thus it is a weak acid.
Palladium possesses to a remarkable extent the power adsorbing or occluding hydrogen. Hence adsorbed hydrogrn by palladium is known as occluded hydrogen.
Zinc doesnot react with cold water.
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