Question

The products formed when phosphine is dissolved in water in the presence of light is
1.H3PO3 is formed
2.Hypo phosphorus acid is formed
3.Red phosphorus and hydrogen is formed
4.H3Po4 is formed​

Answer 1

Answer:

Phosphine on heating at 150∘C burns forming H3PO4

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Answer 2

Answer:

When the phosphine is dissolved in water in the presence of light, it will give red phosphorous and hydrogen gas as products.

Therefore, the option (3) is correct.

Explanation:

• Phosphine is the hydride of phosphorous. It has chemical formula PH₃. It is soluble in water. PH₃ is a colorless gas with unpleasant smell. It is poisonous in nature. Phosphine is used to prepare the Holme's signal for ships to know the position of rocks in the sea.
• When phosphine is dissolved in water in the presence of light. It undergoes the decomposition reaction.

             $4PH_{3} \;(aq)\; \; + \; \; {h\nu}\;\; \longrightarrow \; P_{4}(s)\; \; +\; \; 6H_{2}(g)$

Therefore, the aqueous solution of phosphine in the presence of light gives red phosphorous and hydrogen gas.