MCQ
The adjoining diagram shows the velocity versus time plot for a particle. The work done by the force on the particle is positive from


- ✓$A$ to $B$
- B$B$ to $C$
- C$C$ to $D$
- D$D$ to $E$

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$I$. All isotopes of an element 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-$16$.
Choose the correct option regarding an isotope.

$[\lambda$ is the radioactive decay constant]