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Earn 100

Regarding chemical behaviour of Li and Mg which of the following statements are correct.
(a)Both form nitrides (Li3 N and Mg3 N2) on direct combination with N2 on heating
(b)Both LiCl and Mg2Cl2 are deliquescent and crystallise from aqueous solutions as hydrates LiCl2. 6H2O and MgCl2 . 6H2O
(c)Both Li2CO3 and MgCO3 decompose on heating with evolution of CO2 & simultaneous oxide formation
(d)Both LiNO3 and Mg(NO3)2 decompose with evolution of NO2(g) & O2(g)

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Important Questions on The s-Block Elements
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Identify the ions which form hydrated chlorides from the following:

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Lithium has the highest hydration enthalpy among the alkali metals.
Lithium chloride is insoluble in pyridine.
Lithium cannot form ethynide upon its reaction with ethyne.
Both lithium and magnesium react slowly with .

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Given below are two statements:
Statement I : The chlorides of and have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.
Statement II: Hydroxides of and dissolve in excess alkali to give beryllate and aluminate ions. In the light of the above statements. Choose the correct answer from the options given below.

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Among the statement (I – IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II) Be has higher ionization enthalpy than AI.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds

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