The chances of a scorpion killing a crab are slim, but it is possible. The size and aggressiveness of the scorpion are the most important factors in determining the outcome of a fight between the two creatures.
A small, timid scorpion is not likely to kill a crab, but a larger, more aggressive one could easily do so. The venom of a scorpion is powerful enough to kill a crab, and the claws of the scorpion could easily tear the crab apart.
However, it is also worth noting that crabs are capable of defending themselves. They have sharp claws that can disable a scorpion, and they are also capable of fighting back. In general, the chances of a scorpion killing a crab are slim, but it is possible.
Conclusion
The article does not provide a definite answer but notes that a scorpion’s venom can be deadly to a crab. It is possible that a scorpion could kill a crab, but this would likely depend on the size and species of both the scorpion and the crab.