Which equation best represents a Single Replacement reaction that can occur?

2Cu + FeSO4 = Fe + Cu2SO4
Ag + KNO3 = K + AgNO3
I2 + MgCl2 = Cl2 + MgI2
K + NaF = KF + 2Na

‘which reaction would most likely require the use of an inert electrode?

How many valence electrons are in atom of radon?

Agust of wind blowing east pushes against a ball. when will the wind do work on the ball? when the ball moves to the east when the ball moves to the north when the ball stays in one place when the ball moves north or south