When metal X is treated with dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name the gas Z.
(d) Is gas Z lighter than or heavier than air?
(e) Is the reaction between metal X and dilute acid Y exothermic or endothermic?
(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate the physical states of all the reactants and products
a) Two metals that can behave like metal X are Zinc (Zn) and Iron (Fe).
b) Two acids that can behave like acid Y are dilute hydrochloric acid (HCl) and dilute sulphuric acid (H2SO4).
c) The gas Z is Hydrogen (H2).
d) The gas Z (i.e hydrogen) is lighter than air, as it is the lightest element present in the periodic table.
e) The reaction between metal X and dilute acid Y is exothermic as it produces a huge amount of heat.
f) If metal X is zinc (Zn) and acid Y is dilute hydrochloric acid (HCl), then the equation can be written as:
$Zn( s) +2HCl( aq)\rightarrow ZnCl_{2}( aq) +H_{2}( g)$
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