Question:
Holme?? signal uses chemical compound
Holme?? signal uses chemical compound
Updated On: Jul 6, 2022
- calcium carbide
- calcium phosphide
- calcium carbide and calcium phosphide
- calcium carbide and aluminium carbide
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The Correct Option is C
Solution and Explanation
Holmes signal uses calcium carbide and calcium phosphide. The spontaneous combustion of phosphine is technically used in Holmes signals. Containers containing a mixture of calcium carbide and calcium phosphide are pierced and thrown in the sea when the gases burn and serve as a signal.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family