Question

Consider the following reactions : (i) $Al+NaOH+{{H}_{2}}O\xrightarrow{\Delta }$ (ii) ${{F}_{2}}+NaOH(conc.)\xrightarrow{{}}$ (iii) $NaOH+P(white)+{{H}_{2}}O\xrightarrow{{}}$ The correct set of reactions which give gaseous product is

• A. I, II and III
• B. only I and II
• C. only I and III
• D. only II and III

Answer 1

Answer: (A)

I, II and III

Answer 2

$2Al+2NaOH+2{{H}_{2}}O\to \underset{\text{sod}\text{.meta}\,\text{aluminate}}{\mathop{2NaAl{{O}_{2}}}}\,+{{H}_{2}}$ $2{{F}_{2}}+2NaOH(conc.)\xrightarrow{{}}{{O}_{2}}+4NaF+2{{H}_{2}}O$ $\underset{(white)}{\mathop{{{P}_{4}}}}\,+3NaOH+3{{H}_{2}}O\to \underset{\text{Sod}\text{.}\,\text{hypophosphite}}{\mathop{3Na{{H}_{2}}P{{O}_{2}}}}\,+\underset{\text{Phosphene}}{\mathop{P{{H}_{3}}}}\,$ So, all the three reactions give gaseous products.