1. Which gas is formed when calcium phosphide reacts with water?
A.
Phosphine
B.
Phosphorus pentachloride
C.
Phosphorus trichloride
D.
Phosphoric acid
Correct Answer:
Phosphine
Explanation:
Calcium phosphide reacts with water to produce phosphine gas, along with calcium hydroxide.
2. What is the common metal phosphide used for the preparation of phosphine by hydrolysis?
A.
Calcium phosphide
B.
Calcium carbonate
C.
Sodium chloride
D.
Aluminium oxide
Correct Answer:
Calcium phosphide
Explanation:
Calcium phosphide undergoes hydrolysis with water to form phosphine.
3. What is the product formed from the phosphorus part of calcium phosphide when it reacts with water?
A.
Phosphine
B.
Phosphorus acid
C.
Phosphorus pentoxide
D.
Phosphorus chloride
Correct Answer:
Phosphine
Explanation:
The phosphide ion in calcium phosphide is converted into phosphine when treated with water.
4. Which equation correctly represents the reaction of calcium phosphide with water?
A.
Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3
B.
Ca3P2 + 3H2O → 3CaO + 2PH3
C.
Ca3P2 + 6H2O → 3CaCl2 + 2PH3
D.
Ca3P2 + 2H2O → 3Ca(OH)2 + PH3
Correct Answer:
Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3
Explanation:
One mole of calcium phosphide reacts with six moles of water to form three moles of calcium hydroxide and two moles of phosphine.
5. When aluminium phosphide is treated with water, which gas is released?
A.
Phosphine
B.
Ammonia
C.
Hydrogen chloride
D.
Sulfur dioxide
Correct Answer:
Phosphine
Explanation:
Aluminium phosphide reacts with water and releases phosphine gas.
6. What type of reaction occurs when a metal phosphide reacts with water to form phosphine?
A.
Hydrolysis
B.
Combustion
C.
Neutralisation only
D.
Dehydration
Correct Answer:
Hydrolysis
Explanation:
Metal phosphides react with water through hydrolysis, producing phosphine and a metal hydroxide.
7. Which substance reacts with water to give phosphine and calcium hydroxide?
A.
Calcium phosphide
B.
Calcium phosphate
C.
Calcium oxide
D.
Calcium chloride
Correct Answer:
Calcium phosphide
Explanation:
Calcium phosphide reacts with water according to the equation Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3.
8. What is the formula of the metal phosphide commonly used to prepare phosphine in the laboratory?
A.
Ca3P2
B.
CaP
C.
Ca2P3
D.
CaP2
Correct Answer:
Ca3P2
Explanation:
Calcium phosphide has the formula Ca3P2 and produces phosphine on reaction with water.
9. Which reagent can decompose calcium phosphide to produce phosphine?
A.
Water
B.
Oxygen
C.
Nitrogen
D.
Carbon dioxide
Correct Answer:
Water
Explanation:
Water hydrolyses calcium phosphide and releases phosphine gas.
10. What other product is formed when calcium phosphide reacts with water to prepare phosphine?
A.
Calcium hydroxide
B.
Calcium chloride
C.
Calcium carbonate
D.
Calcium nitrate
Correct Answer:
Calcium hydroxide
Explanation:
The reaction Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3 produces calcium hydroxide along with phosphine.
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