Which of the following is the correct order of decreasing reactivity? A. Iron, potassium, magnesium, gold, copper
B. Magnesium, copper, iron, gold, potassium
C. Gold, potassium, iron, copper, magnesium
D. Potassium, magnesium, iron, copper, gold

The decreasing order of chemical reactivity is given below.

(most active) Na > Ca > Mg > Zn > Fe > Cu (least active)

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.