Unit - Alkali and Alkaline Earth Metals I Choose the best answer. . (c) Density: Li < K < Na < Rb < C . (a) Li + has minimum degree of hydration among alkali metal cations .
(d) none of these . (b) Li . (c) kerosene . (a) superoxide and paramagnetic .
(c) Potassium carbonate can be prepared by solvay process . (b) Magnesium . (b) MI < MBr < MCl < MF . (a) Castners process .
(c) Ca(CN) . (a) MgCl . (a) p- , q- , r- , s- , t- , u- . (d) both assertion and reason are false .
(a) . (b) MgCO > CaCO > SrCO > BaCO . (c) Its salts are rarely hydrolysed . (c) milk of lime .
(b) NaHCO . (b) Ca(OH) EVALUATION . (a) Ca + ions are not important in maintaining the regular beating of the heart. .
(b) CaF . (a) CaSO .2H O . (b) CaNCN . (d) Li CO Keys to multiple choice questions: ) Option (c) Potassium is lighter than sodium (Refer table .
) The correct order of density is Li < K < Na < Rb < Cs . < . < . < .
< . (in g cm – ) ) Option (a) Li + has maximum degree of hydration among alkali metal cations. Li + > Na + > K + > Rb + > Cs + ) All these compounds reacts with alkali metals to evolve hydrogen gas. (d) none of these.
) hydration energy of Li + is more and hence Li + is stabilized in aqueous medium. (b) Li ) (c) Kerosene 11th Std Chemistry 11th Std Chemistry - - - - ) RbO is a super oxide which contains Rb+ and O – ions. O – contains one unpaired electron and hence it is paramagnetic. Option (a) ) Potassium carbonate cannot be prepared by solvay process.
Potassium bicarbonate is fairly soluble in water and does not precipitate out. Option