Question

7. A metal X reacts with dil.HCl to produce a metallic salt Y and H2 gas. X is more reactive
than aluminium and less reactive than calcium. Then X and Y are likely to be:

a) X=mg Y=mgcL2 B) X=fe y=fecl2 c) X=al y=alcl3 d) x=ba y=bacl2​

Answer 1

Answer:

d) X = ba Y = bacl2

I am right

Answer 2

The metal 'X' is Magnesium (Mg) and the salt 'Y' is Magnesium Chloride (MgCl2). (option a)

• In the reactivity series of metals, magnesium comes in between aluminium and calcium for higher reactivity. Hence, it can easily react with dil. HCl.
• Mg atom is larger than Al. Though Al comes after magnesium in the periodic table, it has 3 valence electrons which are pulled towards the nucleus. On the other hand, Mg has only 2 valence electrons and the force by the nucleus is lesser. Mg can hence lose two electrons easily compared to Al.
• Mg reacts with dil.HCl to form MgCl2 by displacing the hydrogen, which is liberated in the form of H2 gas.

Mg + 2HCl → MgCl2 + H2↑