Elemental Phosphorus Is a Molecular Solid Consisting of P₄ Molecules

question 36

Multiple Choice

Elemental phosphorus is a molecular solid consisting of P₄ molecules.It melts at 44°C.What is the principal force present in P₄(s) ?

• A) Dipole forces
• B) Hydrogen bonding
• C) Dispersion forces
• D) Metallic bonding
• E) Ionic bonding

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Definitions:

END Instruction

A programming command that specifies the end of a block of code or the conclusion of a program's logic sequence.

User Program

A software application or set of instructions created by a user or developer to perform specific tasks on a computer or device.

XIC

Stands for "Examine if Closed", a PLC programming instruction used to check if a specified contact or virtual contact is in the closed state.

XIO

An instruction used in ladder logic programming that represents "Examine if Open," checking if a specific condition is not met or a device is inactive.