chemistry : class12 Calcium phosphide hydrolysis : Preparation of phosphine : p-Block Elements MCQ Questions and Answers
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Calcium phosphide hydrolysis
MCQ questions and answers.
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MCQ Questions
1. What is formed when calcium phosphide reacts with water?
A.
Phosphine and calcium hydroxide
B.
Phosphorus and calcium oxide
C.
Phosphoric acid and calcium metal
D.
Phosphorus pentachloride and calcium hydroxide
Correct Answer:
Phosphine and calcium hydroxide
Explanation:
Calcium phosphide undergoes hydrolysis with water to form phosphine (PH3) gas and calcium hydroxide, according to Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3.
2. Which gas is produced during the hydrolysis of calcium phosphide?
A.
Ammonia
B.
Phosphine
C.
Hydrogen
D.
Phosphorus pentoxide
Correct Answer:
Phosphine
Explanation:
Hydrolysis of calcium phosphide produces phosphine gas, PH3.
3. What is the chemical formula of calcium phosphide used in the hydrolysis reaction?
A.
CaP
B.
Ca2P3
C.
Ca3P2
D.
CaP2
Correct Answer:
Ca3P2
Explanation:
Calcium phosphide has the formula Ca3P2 and reacts with water to produce phosphine and calcium hydroxide.
4. Which substance reacts with calcium phosphide to produce phosphine?
A.
Water
B.
Nitrogen
C.
Carbon dioxide
D.
Oxygen
Correct Answer:
Water
Explanation:
Calcium phosphide is hydrolysed by water, producing phosphine gas and calcium hydroxide.
5. Which is the balanced equation for the hydrolysis of calcium phosphide?
A.
Ca3P2 + 3H2O → 3CaOH + 2PH3
B.
Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3
C.
Ca3P2 + 2H2O → 3Ca(OH)2 + PH3
D.
Ca3P2 + 6H2O → Ca(OH)2 + 3PH3
Correct Answer:
Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3
Explanation:
The balanced hydrolysis equation is Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3, conserving calcium, phosphorus, hydrogen, and oxygen atoms.
6. What type of reaction occurs when calcium phosphide reacts with water to form phosphine?
A.
Hydrolysis
B.
Combustion
C.
Neutralisation
D.
Decomposition by heat
Correct Answer:
Hydrolysis
Explanation:
The reaction is called hydrolysis because calcium phosphide reacts with water to form phosphine and calcium hydroxide.
7. How many moles of phosphine are produced from one mole of calcium phosphide in its hydrolysis reaction?
A.
One mole
B.
Two moles
C.
Three moles
D.
Six moles
Correct Answer:
Two moles
Explanation:
From the balanced equation Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3, one mole of calcium phosphide produces two moles of phosphine.
8. What is the other product, besides phosphine, formed in the hydrolysis of calcium phosphide?
A.
Calcium carbonate
B.
Calcium oxide
C.
Calcium hydroxide
D.
Calcium phosphate
Correct Answer:
Calcium hydroxide
Explanation:
Water reacts with calcium phosphide to form calcium hydroxide along with phosphine gas.
9. How many moles of water are required to hydrolyse one mole of calcium phosphide completely?
A.
Two moles
B.
Three moles
C.
Four moles
D.
Six moles
Correct Answer:
Six moles
Explanation:
The balanced equation shows that one mole of Ca3P2 requires six moles of water: Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3.
10. If 3 moles of calcium phosphide are completely hydrolysed, how many moles of phosphine are formed?
A.
2 moles
B.
3 moles
C.
6 moles
D.
9 moles
Correct Answer:
6 moles
Explanation:
The reaction produces 2 moles of PH3 from 1 mole of Ca3P2. Therefore, 3 moles of Ca3P2 produce 6 moles of phosphine.
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