Ncert Solutions Chemistry Class 11th
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11 months agoContributor-Level 10
(a) Due to its the lowest ionization energy, Cs is considered as the most electropositive element.
(b) Lithium cannot be used in making photoelectric cells because out of all the alkali metals it has the highest ionization energy and thus cannot emit electrons when exposed to light.
(c) Due to small size, lithium does not form alums
New answer posted
11 months agoContributor-Level 10
Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.
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11 months agoContributor-Level 10
The loosely held s-electron in the outermost valence shell of these elements makes them the most electropositive metals which readily give ions, M+ or M2+.
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11 months agoContributor-Level 10
Li+ has maximum degree of hydration due to its small size and for this reason lithium salts are mostly hydrated.
New answer posted
11 months agoContributor-Level 10
Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
New answer posted
11 months agoContributor-Level 10
Lithium, sodium, potassium, rubidium, caesium and Francium are group I elements and collectively known as the alkali metals.
They are called as the alkali metals because they form hydroxides on reaction with water which are strongly alkaline in nature.
New answer posted
11 months agoContributor-Level 10
The ionic radius of Be2+ is estimated to be 31 pm; the charge/radius ratio is nearly the same as that of the Al3+ ion. Hence beryllium resembles aluminium in some ways. Some ofthe similarities are:
(i) Like aluminium, beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
(ii) Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion, [Be (OH)4]2– just as aluminium hydroxide gives aluminate ion, [Al (OH)4]–.
(iii) The chlorides of both beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are solubl
New question posted
11 months agoNew answer posted
11 months agoContributor-Level 10
(c) Reason is wrong a statement. More negative is the electrode potential, higher is the tendency of the element to lose electrons and hence, stronger is the reducing agent.
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