To solve this problem, we will first see what is actually happening in this reaction.
Then we look at it with the help of the reaction and finally, we will analyze the final product.
So let's understand that the reactants are phosphonium and sodium hydroxide and by heating these we get phosphine gas, water, and sodium iodide.
The reaction is below :
PH4I+NaOH→PH3+H2O+NaI
So, this is the final reaction of the given half-reaction. So, the correct answer is phosphine gas.
So, the correct option is A.
Given below are two statements. 
In the light of the above statements, choose the correct answer from the options given below:
Given below are two statements:
Statement I: Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of $\mathrm{p} \pi-\mathrm{p} \pi$ bond with oxygen.
Statement II: Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
In the light of the above statements, choose the correct answer from the options given below:
Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. $(\mathrm{B}<\mathrm{Al}),(\mathrm{Al}<\mathrm{Ga}),(\mathrm{Ga}<\mathrm{In})$ and $(\mathrm{In}<\mathrm{Tl})$ Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius $\left(\mathrm{M}^{3+}\right)$ than the other one. The atomic number of the element (X) is
The current passing through the battery in the given circuit, is: 
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :