No motherboard has one slot of RAM
Yes, workstations and servers have 2 slot motherboards.
No, it's Intel CPU Based Motherboard
No, the motherboard will only support the i3, i5, and i7 CPUs.
A CPU is a small square chip that is secured to the motherboard.
Not possible. Every motherboard only has one CPU slot and can only hold one CPU (even though the i7's a quad-core, they're built into one piece which fits into the one slot).
Some motherboards come with a CPU installed, but it is not, technically, part of the motherboard itself, but part of a substructure known as a chipset.
yes motherboard is a part of CPU
The only thing that affects the decision on RAM is a motherboard. Your motherboard can only support a certain type of RAM.
Case, Power Supply and Motherboard The case must support the form factor of the motherboard, and the motherboard must support the CPU socket type for any given CPU.
IRQ
No, A Pentium 1 is a type of CPU chip. They don't make them anymore. It is a single core and would have to be used on an old motherboard with the proper pin slot.
Your motherboard may need to be changed when your CPU is upgraded.