On heating with concentrated $N a O H$ solution in an inert atmosphere of ${C O}_{2}$ , white phosphorous gives a gas. Which of the following statement is incorrect about the gas?

It is less basic than

{N H}_{3}

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It is more basic than

{N H}_{3}

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It is highly poisonous and has smell like rotten fish

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It's solution in water decomposes in the presence of light

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Solution

The correct option is B It is more basic than ${N H}_{3}$
$P_{4} + 3 N a O H + 3 H_{2} O ⟶ P H_{3} + 3 N a H_{2} P O_{2}$

Ammonia is a stronger base than phosphine because in ammonia the central atom Nitrogen is smaller hence electron density is concentrated within smaller range and easily available. Whereas in the case of phosphine the size of phosphorous is large electron cloud is distributed in a large area & not easily available.

Hence, the correct option is $B$ .

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On heating with concentrated NaOH solution in an inert atmosphere of CO2, white phosphorous gives a gas. Which of the following statement is incorrect about the gas?

On heating with concentrated $N a O H$ solution in an inert atmosphere of ${C O}_{2}$ , white phosphorous gives a gas. Which of the following statement is incorrect about the gas?