Amixture consists of ag pb and fe metals. which of these metals will react with zncl2

Non of these elements in the mixture will react with Zinc chloride (ZnCl2).
 This is because; silver, lead and iron are below zinc in the reactivity series and therefore, non of these metals can displace Zinc from is salt (zinc chloride).
Metals higher in the reactivity series have the ability to displace less reactive metals from their salts. 

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .