Comment on each of the following observations:
(a) The mobilities of the alkali metal ions in aqueous solution are `Li^(+)ltNa^(+) lt K^(+) lt Rb^(+) lt Cs^(+)`
(b) Lithium is the only alkali metal to form a nitride directly
(c) `E^(Theta)` for `M^(2+)` (aq) `+2e^(-)rarrM(s)` (where M=Ca, Sr or Ba) is nearly constant

The mobilities of the alkali metal ions in aqueous solution are Li^(+) lt Na^(+) lt K^(+) lt Rb^(+) lt Cs^(+) because

Comment on each of the following observation: a. The mobilities of the alkali metal ions in aqueous solution are Li^(o+)ltNa^(o+)ltK^(o+)ltRb^(o+)ltCs^(o+) . b. Lithium is the only alkali metal to form a nitride directly. c. E^(ө) for M_(aq)^(2+)+2e^(-)to M_((s)) (where M=Ca,Sr or Ba) is nearly constant.

The alkali metal that reacts with nitrogen directly to form nitride is: a) Li b) Na c) K d) Rb

Consider the following statements 1. Cs^+ ion is more highly hydrated than other alkali metal ions 2. Among the alkali metals Li, Na , K and Rb, Lithium (Li) has the highest melting point 3. Among the alkali metals , only lithium form a stable nitride by direct combination . O these statements

The ease of adsorption of the hydrated alkali metal ions on ion-exchange resins follows the order: (a) K^(+) lt Na^(+) lt Rb^(+) lt Li^(+) (b) Na^(+) lt Li^(+) lt K^(+) lt Rb^(+) (c) Li^(+) lt K^(+) lt Na^(+) lt Rb^(+) (d) Rb^(+) lt K^(+) lt Na^(+) lt Li^(+)

When alkaline earth metals dissolve ini ammonia, they form coloured solution like alkali metals. Which of the following observations regarding the reaction are correct? (i) Dilute solutions are bright blue in colour due to solvated electrons. (ii) These solutions decompose to form amides and hydrogen. (iii) From this solution the ammoniates [M(NH_(3))_(6)]^(2+) can be recovered by evaporation.

How many of the following nitrates of metal 'M' decompose on heating similar to as given below in the scheme? (where M = Li , Be, Mg, K, Ca, Sr, Na , Rb, Ba) Metal nitrate overset("Heat")rarr metal oxide + nitrogen dioxide + oxygen gas.

Consider the following points : (a) Cs is the strongest reducing agent is IA group element (B)" "Be(OH)_(2) is amphoteric (c ) The density of potassium is less than sodium (d) In alkali metals Li,Na,K and Rb , lithium has the minimum value of M.P. Correct statements are :

Choose the correct answers: a. Which of the following alkali metal is the most electropositive ? i. Na , ii. K , iii. Rb , iv. Cs b. Which of the following alkali metals has the lowest m.pt. ? i. Li , ii. K , iii. Na , iv. Rb c. Which of the following is the stronger reducing agent ? i. Li , ii. Na , iii. K , iv Rb

S_(2) : Plaster of paris is a hemihydrate of calcium sulphate obtained by heating the gypsum above 393K . S_(2) : Sodium carbonate is used in water softening. S_(4) : The order of mobilities of the alkali metal ions in aqueous solutions is Li^(+)gtNa^(+)gtK^(+)gtRb^(+)gtCs^(+)