Consider the following statements:
(I) | All isotopes of elements have the same number of neutrons. |
(II) | Only one isotope of an element can be stable and non-radioactive. |
(III) | All elements have isotopes. |
(IV) | All isotopes of carbon can form chemical compounds with oxygen\(\text-16\). |
The correct option regarding an isotope is:
1. | (III) and (IV) only |
2. | (II), (III), and (IV) only |
3. | (I), (II), and (III) only |
4. | (I), (III), and (IV) only |
1. | Neutrons | 2. | Alpha particles |
3. | Beta particles | 4. | Gamma photons |
1. | It may emit \(\alpha\text-\)particle. |
2. | It may emit \(\beta^{+}\) particle. |
3. | It may go for \(K\) capture. |
4. | All of the above are possible. |
1. | \(6\) and \(8\) | 2. | \(6\) and \(6\) |
3. | \(8\) and \(8\) | 4. | \(8\) and \(6\) |
If a proton and anti-proton come close to each other and annihilate, how much energy will be released?
1. | \(1.5 \times10^{-10}~\text{J}\) | 2. | \(3 \times10^{-10}~\text{J}\) |
3. | \(4.5 \times10^{-10}~\text{J}\) | 4. | None of these |
1. | \({ }_{7}^{14} \mathrm{N}\) | 2. | \({ }_{5}^{13} \mathrm{B}\) |
3. | \({ }_{7}^{13} \mathrm{N}\) | 4. | \({ }_{6}^{13} \mathrm{C}\) |
Fusion reaction takes place at a higher temperature because:
1. | atoms get ionized at high temperatures. |
2. | kinetic energy is high enough to overcome the Coulomb repulsion between nuclei. |
3. | molecules break up at a high temperature. |
4. | nuclei break up at a high temperature. |
1. | \({}_{34}^{74}\mathrm{Se}, {}_{31}^{71}\mathrm{Ca}\) | 2. | \({}_{42}^{92}\mathrm{Mo}, {}_{40}^{92}\mathrm{Zr}\) |
3. | \({}_{38}^{81}\mathrm{Sr}, {}_{38}^{86}\mathrm{Sr}\) | 4. | \({}_{20}^{40}\mathrm{Ca}, {}_{16}^{32}\mathrm{S}\) |
1. | \(1.5\times 10^{17}\) | 2. | \(3\times 10^{19}\) |
3. | \(1.5\times 10^{25}\) | 4. | \(3\times 10^{25}\) |