Question

plz answer these questions​

Answer 1

Explanation:

22. I)The metal M is zinc (Zn)

ii)The carbonate ore is first heated strongly in limited supply of oxygen and changed into its oxide. This process is called calcination. ZnCO3(s) +Heat----->ZnO(s) +CO2(g) Zinc oxide is then reduced to zinc metal by heating it with carbon. This process is called reduction. ZnO(s) + C(s) +Heat ----> Zn(s) + CO(g)

24) total focal length =10 -5

=5

power = 1/f

we know that f=5

then,

P=1/5

=0.2D