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Molecular Basis of Inheritance Neetprep Objective for Students
A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of the reaction is
(A) 1
(B) 2
(C) 3
(D) 0
Option a – 1
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
(A) Rate is proportional to the surface coverage.
(B) Rate is inversely proportional to the surface coverage.
(C) Rate is independent of the surface coverage.
(D) Rate is decomposition is very low.
Option a – Rate is proportional to the surface coverage
When the initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is
(A) Second
(B) More than zero but less than first
(C) Zero
(D) First
Option d – First
In the first-order reaction, the concentration of the reaction is reduced to 25% in one hour. The half-life period of the reaction is
(A) 2 hrs
(B) 4 hrs
(C) 1/2 hr
(D) 1/4 hrs
Option c – 1/2 hr
75% of a first-order reaction is completed in 30 min what is the time required for 93.75% of the reaction (in min)
(A) 45
(B) 90
(C) 120
(D) 60
Option d – 60
If the initial concentration is reduced to 1/4 th in a zero-order reaction the time taken for half the reaction to complete
(A) Remains the same
(B) Becomes 4 times
(C) Becomes 1/4
(D) Becomes double
Option a – Remains the same
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