If the concentration of a solution is changed from 0.2 to 0.4, then what will be rate and rate constant. The reaction is of first order and rate constant is :
1.
2.
3.
4.
Half-life of a radioactive sample is 4 days. After 16 days what quantity of matter remains undecayed?
1.
2.
3.
4.
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 |
A 300-gram radioactive sample has a half-life of 3 hours. After 18 hours the remaining quantity will be:
1. 4.68 gram
2. 2.34 gram
3. 3.34 gram
4. 9.37 gram
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
The reaction A → B follows first-order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. The time taken for the conversion of 0.9 mol of A to produce 0.675 mol of B will be:
1. | 1 hour | 2. | 0.5 hour |
3. | 0.25 hour | 4. | 2 hour |
The radioisotope, tritium has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years:
1. | 1 mg | 2. | 2 mg |
3. | 4 mg | 4. | 8 mg |
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 |
For a first-order reaction A → B the reaction rate at a reactant concentration of 0.01M is found to be . The half-life period of the reaction is:
1. | 300s | 2. | 30s |
3. | 220s | 4. | 347s |