Q: Phosphine is prepared by the reaction of :

P_4 +3NaOH+3H_2O \to PH_3 +3NaH_2PO_2 (White) Phosphine Sod.hypophosphitePhosphine is prepared by dissolving white phosphorous in boiling NaOH solution.Option B is correct.

Question 1

Holmes signals can be given by using :

Accepted Answer

Holmes signal - A mixture of calcium carbide and calcium phosphide placed in a container which reacts with water to produce gases  (PH_3  and  C_2H_2)  which burn and thus guide the ships in the sea.

Question 2

Compound A undergoes hydrolysis to produce a colourless gas with rotten fish smell. The gas gives a vortex ring. The gas is :

Accepted Answer

Phosphine is colorless, flammable and explosive gas at ambient temperature that  having 'rotten fish' smell and it forms vortex ring.

Question 3

Phosphine, acetylene and ammonia can be formed by treating water with :

Accepted Answer

Correct Answer: Option B

Explanation:

The chemical formula of Phosphine is  PH_3 ; Acetylene is  C_2H_2 
and Ammonia is  NH_3 .Formation of Phosphine:

Ca_3P_2+6H_2O\rightarrow
3Ca\left ( OH \right )_2+2PH_3

Formation of Acetylene:

CaC_2\left ( s
\right )+2H_2O\left ( l \right )\rightarrow Ca\left ( OH \right )_2\left ( s
\right )+C_2H_2\left ( g \right )

Formation of Ammonia:

Mg_3N_2+6H_2O\rightarrow
3Mg\left ( OH \right )_2+2NH_3

Question 4

Phosphine is prepared by the reaction of :

Accepted Answer

P_4 +3NaOH+3H_2O 	o PH_3 +3NaH_2PO_2 (White)                          Phosphine   Sod.hypophosphitePhosphine is prepared by dissolving white phosphorous in boiling  NaOH  solution.Option B is correct.

Question 5

What may be expected to happen when phosphine gas is mixed with chlorine gas?

Accepted Answer

PH_3  is highly poisonous it explodes with traces of oxidizing agent like  HNO_3,\ Cl_2  and  Br_2  vapors. PH_3+3Cl_2 \rightarrow PCl_3 + 3 HCl;\ \Delta H=-ve Hence,  PCl_3  and  HCl  are formed and the mixture warms up as heat is evolved.

Question 6

One mole of calcium phosphide on reaction with an excess of water gives:

Accepted Answer

The reaction is as follows: Ca_{3}P_{2} + 6H_{2}O \rightarrow 2PH_{3} + 3Ca(OH)_2 Hence, one mole of calcium phosphide on reaction with an excess of water gives  2  moles of phosphine.

Question 7

One mole of calcium phosphide on reaction with excess of water gives:

Accepted Answer

Ca_3P_2 + 6H_2O \rightarrow 3Ca(OH)_2 + 2PH_3 1 mol of  Ca_3P_2 = 2\, moles \, of\, PH_3  It shows that one mole of calcium phosphide on reaction with excess of water gives 2 moles of phosphine.

Question 8

Holme's signal uses chemical compound?

Accepted Answer

The spontaneous combustion process of phosphine( PH_3 )  is principle  used in Holme's signals. Containers containing
calciumcarbide and calcium phosphide are pierced and thrown in the sea when the
gases evolved burn and serve as a signal . It is also used in smoke screens.Hence option C is correct

Question 9

PH_4I+NaOH  forms:

Accepted Answer

PH_4I + NaOH  gives Phosphine, Water and Sodium Iodide. PH_4I + NaOH\rightarrow PH_3 + H_2O + NaI Hence option A is correct.

Question 10

aqueous  NaOH+{ P }_{ 4 }\left( white \right) \longrightarrow P{ H }_{ 3 }+X.  Compound X is:

Accepted Answer

The reaction is,  P_4+3NaOH+3H_2O \rightarrow PH_3+3NaH_2PO_2 White phosphorus react with sodium hydroxide and water to produce phosphine and sodium hypophosphite . Sodium hydroxide - cold, concentrated solution. This reaction takes place slow.Hence option A is correct answer.

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Compounds of Phosphorus - Phosphine

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Compounds of Phosphorous- Phosphine

Important Questions

Holmes signals can be given by using :

Compound A undergoes hydrolysis to produce a colourless gas with rotten fish smell. The gas gives a vortex ring. The gas is :

Phosphine, acetylene and ammonia can be formed by treating water with :

Phosphine is prepared by the reaction of :

What may be expected to happen when phosphine gas is mixed with chlorine gas?

One mole of calcium phosphide on reaction with an excess of water gives:

One mole of calcium phosphide on reaction with excess of water gives:

Holme's signal uses chemical compound?

$P H_{4} I + N a O H$ forms:

aqueous $N a O H + P_{4} (w h i t e) ⟶ P H_{3} + X .$ Compound X is:

Revise with Concepts

Compounds of Phosphorus - Phosphine

Learn with Videos

Quick Summary With Stories

Compounds of Phosphorous- Phosphine

Important Questions

Holmes signals can be given by using :

Compound A undergoes hydrolysis to produce a colourless gas with rotten fish smell. The gas gives a vortex ring. The gas is :

Phosphine, acetylene and ammonia can be formed by treating water with :

Phosphine is prepared by the reaction of :

What may be expected to happen when phosphine gas is mixed with chlorine gas?

One mole of calcium phosphide on reaction with an excess of water gives:

One mole of calcium phosphide on reaction with excess of water gives:

Holme's signal uses chemical compound?

PH4​I+NaOH forms:

aqueous NaOH+P4​(white)⟶PH3​+X. Compound X is:

$P H_{4} I + N a O H$ forms:

aqueous $N a O H + P_{4} (w h i t e) ⟶ P H_{3} + X .$ Compound X is: