Question

Which is not a chemical reaction of the alkali metal sodium?

Select one: A. 2 Na(s) + 2 NH3(l) → 2 NaNH2(sol) + H2(g)

B. 2 Na(s) + Cl2(g) → 2 NaCl(s)

C. 2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g)

D. 4 Na(s) + 2 O2(g) → 2 Na2O(s) + Na2O2(s)

Answer 1

In any chemical reaction, if the sodium base compound forms in the product, then it is called as alkali metal sodium. The detail explanation is given as below:- Reactions are given by; 2Na(s) + 2NH3(1) ► 2NaNH2(sol) + H2(g) ... (1) 2Na(s) + 2H2O(1) ► 2NaOH(aq) + H2(g) ... (2) 4Na(s) + 2O2(g) → 2 Na2O(s) + Na2O2(s) ... (3)

Since, in all the above reactions there are the formation of NaNH2 (in reaction 1), NaOH (in reaction 2) and Na2O (in reaction 3) which all are the alkali metal sodium because it is acting as a base or alkali. But in the reaction given as below:- 2Na(s) + Cl2(g) + 2NaCl(s) ... (4)

Since, in the above reaction there is a formation of NaCl which is not the alkali metal sodium because it is acting as a neutral solution. So, the correct option will be; (B) 2Na(s) + Cl2(g) → 2NaCl(s)