Question

Metals $W,X,Y$ and $Z$ are reacted with dilute hydrochloric acid.
The oxides of metals $W,X,Y$ and $Z$ are heated with carbon.
The results are shown.

Reaction	$W$	$X$	$Y$	$Z$
$metal+dilutehydrochloricacid$	fizzing	fizzing	violent fizzing	no reaction
$metaloxide+carbon+heat$	no reaction	metal produced	no reaction	metal produced

What is the order of reactivity of the metals?

• A. $Y,W,X,Z$
• B. $Y,Z,W,Z$
• C. $Z,W,X,Y$
• D. $Z,X,W,Y$

Answer 1

Answer: (A)

$Y,W,X,Z$

$\text{Y is more reactive toward dilute hydrochloric acid while Z is least reactive.}$

$\text{When metal oxides react with carbon W and Y makes no reaction while X and Z produce metal.}$

$\text{Analysing both the above statements metals reactivity order can be given as Y,W,X,Z.}$