The rate of a first-order reaction is 1.5 ×10–2 mol L–1 min–1 at 0.5 M concentration of the reactant. The half-life of the reaction is:
1. | 23.1 min | 2. | 8.73 min |
3. | 7.53 min | 4. | 0.383 min |
If the bombardment of α-particle on \(N_{7}^{14}\) emits protons, then new atom will be:
1. \(O_{8}^{17}\)
2. \(O_{8}^{16}\)
3. \(C_{6}^{14}\)
4. Ne
If the half-life of a substance is 77 days then it's decay constant (days-1) will be:
1. | 0.9 | 2. | 0.09 |
3. | 0.009 | 4. | 0.013 |
1.
2.
3.
4.
92U235, nucleus absorb a neutron and disintegrate in 54Xe139, 38Sr94 and x . The product x is:
1. 3 - neutrons
2. 2 - neutrons
3. α - particle
4. β - particle
rate of reaction is equal to:-
1.
2.
3.
4.
; It would be a zero-order reaction when:
1. | The rate of reaction is proportional to the square of the concentration of A |
2. | The rate of reaction remains the same at any concentration of A |
3. | The rate remains unchanged at any concentration of B and C |
4. | The rate of reaction doubles if the concentration of B is doubled |
If at a given instant, for the reaction 2N2O5 → 4NO2 + O2 rate and rate constant are 1.02 × 10-4 and 3.4 × 10-5 sec -1 respectively, then the concentration of at that time will be:
1. 1.732
2. 3.0
3.
4.
When a biochemical reaction is carried out in a laboratory outside the human body in the absence of an enzyme, then the rate of reaction obtained is times. The activation energy of a reaction in the presence of an enzyme is:
1.
2. P is required.
3. Different from obtained in the laboratory.
4. Data is insufficient.
The activation energy for a simple chemical reaction A → B is Ea in a forward direction. The activation energy for the reverse reaction:
1. Is negative of Ea
2. Is always less than Ea
3. Can be less than or more than Ea
4. Is always double of Ea