S Block Elements

Question

Identify the correct statements about alkali metals.

A. The order of standard reduction potential (M… 
 | M) for alkali metal ions is Na > Rb > Li.

B. CsI is highly soluble in water.

C. Lithium carbonate is highly stable to heat.

D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.

E. All the alkali metal hydrides are ionic solids.

Choose the correct answer from the options given below :

Accepted Answer

Option B. A. The order of standard reduction potential (M⁺ | M) for alkali metal ions is Na > Rb > Li. This statement is correct. The standard reduction potential generally increases as we move down the group from Li to Cs so order should be Cs > Rb > K > Na > Li but here Na and K are exception, Na has highest standard reduction potential in the entire group and then K. So right order is Na > K > Cs > Rb > Li. That is why right order is Na > Rb > Li.

More on S Block Elements

S Block Elements

More on S Block Elements