Out of the following, the ________ pipe has the least corrosion resistance?

Lead pencil contains________?

For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium?

In polytropic process (PVn = constant), if n = 1; it means a/an ________ process?

In catalytic cracking, the________?

In an eutectic system, two elements are completely________?