NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- Chemical Equilibrium
NTA Abhyas 2020 · Chemistry · Chemical Equilibrium
The reaction between phosphorus (P_ 4 ) and hydrogen (H_ 2 ) can...
The reaction between phosphorus (P_{4} ) and hydrogen (H_{2} ) can result in the formation of phosphine (PH_{3} ) as shown :
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The graph shows the change in concentration of hydrogen for this reaction in which the system was disturbed after four hours.
Which of the following could& explain the change in hydrogen concentration at time=4 hours?
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The graph shows the change in concentration of hydrogen for this reaction in which the system was disturbed after four hours.
Which of the following could& explain the change in hydrogen concentration at time=4 hours?
Options
- AThe volume on the reaction vessel was decreased
- BA catalyst was added
- CThe pressure on the reaction mixture was decreased
- DMore phosphorus was added
Correct answer
A. The volume on the reaction vessel was decreased
Step-by-step solution
Volume of the vessel was decreased, which led to sudden increase in [H_{2} ]. The reaction then moves in direction to achieve a state of new equilibrium. A catalyst does not affect the equilibrium concentration of reactants and products. Increase in pressure would decrease concentration as reaction favoured forward. P_{4}(s) will have no effect on k_{P} and concentration of H_{2}(g) ( because active mass of solid is taken to be unit ) &