Question

17.
18.
What is Olfactory Indicator ?
What is activity series ? Arrange the decreasing order of reactivity of following metals :
Ag, Zn, K, Al, Fe
How does the valency varies in periods on going from left to right?
OR
9.
I​

Answer 1

Answer:

olfactory indicators are the ones which help to detect smell.

Activity series of metals is the series which help one to understand the reactivity of metals in their decreasing order

K AL ZN FE AG

Explanation:

Answer 2

Answer:

Olfactory indicator means identify whether the substance is acid or base by its odor

reactivity series means the high reacting order of metals

k,AL,ZN,FE

Periods ways decreases