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

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.

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.

Q: Phosphine is obtained by the reaction when_________.

White phosphorous is boiled with aqueous \$NaOH\$ solution to obtain phosphine. \$\displaystyle P_4+3NaOH +3H_2O \rightarrow 3NaH_2PO_2+PH_3\$Hydrolysis of calcium phosphide with water gives phosphine. \$\displaystyle Ca_3P_2+6H_2O \rightarrow 2PH_3+3Ca(OH)_2\$

Q: Phosphine is not obtained, when:

When red phosphorus reacts with \$NaOH, H_4P_2O_6\$ is obtained.\$P_4(Red)+NaOH\longrightarrow H_4P_2O_6\$Hence, Phosphine \$(PH_3)\$ is not obtained.

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

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\$

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

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.

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

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 3

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 4

Phosphine is prepared by the reaction of :

Accepted Answer

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

Question 5

Phosphine is obtained by the reaction when_________.

Accepted Answer

White phosphorous is boiled with aqueous $NaOH$ solution to obtain phosphine.  $\displaystyle P_4+3NaOH +3H_2O \rightarrow 3NaH_2PO_2+PH_3$Hydrolysis of calcium phosphide with water gives phosphine. $\displaystyle Ca_3P_2+6H_2O \rightarrow 2PH_3+3Ca(OH)_2$

Question 6

Phosphine is not obtained, when:

Accepted Answer

When red phosphorus reacts with $NaOH, H_4P_2O_6$ is obtained.$P_4(Red)+NaOH\longrightarrow H_4P_2O_6$Hence, Phosphine $(PH_3)$ is not obtained.

Question 7

Which of the following statement is incorrect for phosphine ?

Accepted Answer

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Question 8

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

Accepted Answer

Correct Answer: Option B&#10;&#10;Explanation:&#10;&#10;The chemical formula of Phosphine is $PH_3$; Acetylene is $C_2H_2$&#10;and Ammonia is $NH_3$.Formation of Phosphine:&#10;&#10;$Ca_3P_2+6H_2O\rightarrow&#10;3Ca\left ( OH \right )_2+2PH_3$&#10;&#10;Formation of Acetylene:&#10;&#10;$CaC_2\left ( s&#10;\right )+2H_2O\left ( l \right )\rightarrow Ca\left ( OH \right )_2\left ( s&#10;\right )+C_2H_2\left ( g \right )$&#10;&#10;Formation of Ammonia:&#10;&#10;$Mg_3N_2+6H_2O\rightarrow&#10;3Mg\left ( OH \right )_2+2NH_3$

Question 9

${P H_3}$ can be obtained by:

Accepted Answer

Phosphine is produced industrially by reaction of white phosphorous with sodium/potassium hydroxide producing sodium or potassium phosphite as a byproduct.$3KOH(hot\quad conc.)+{ P }_{ 4 }+3{ H }_{ 2 }O\longrightarrow 3K{ H }_{ 2 }P{ O }_{ 2 }+P{ H }_{ 3 }$The thermal decomposition of hypophorous acid to produce phosphine is phosphorous acid. This reaction takes place at a temperature of $50&#8451;-140&#8451;$$3{ H }_{ 3 }P{ O }_{ 2 }\underrightarrow { \triangle  } P{ H }_{ 3 }+2{ H }_{ 3 }P{ O }_{ 3 }$Orthophosphorous acid also gives phosphine when heated$4{ H }_{ 3 }P{ O }_{ 3 }\underrightarrow { \triangle  } \longrightarrow 3{ H }_{ 3 }P{ O }_{ 4 }+P{ H }_{ 3 }$Calcium phosphide when reacted with excess of water to produce calcium hydroxide and phosphine gas.${ Ca }_{ 3 }{ P }_{ 2 }+6{ H }_{ 2 }O\longrightarrow 3Ca{ OH }_{ 2 }\left( aq. \right) +2P{ H }_{ 3 }\left( g \right) $Thus, all four options are 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

Holmes signals can be given by using :

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

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

Phosphine is prepared by the reaction of :

Phosphine is obtained by the reaction when_________.

Phosphine is not obtained, when:

Which of the following statement is incorrect for phosphine ?

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

$P H_{3}$ can be obtained by:

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

Holmes signals can be given by using :

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

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

Phosphine is prepared by the reaction of :

Phosphine is obtained by the reaction when_________.

Phosphine is not obtained, when:

Which of the following statement is incorrect for phosphine ?

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

PH3​ can be obtained by:

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

$P H_{3}$ can be obtained by:

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