Question

how is hydrogen prepared using calcium and potassium​

Answer 1

Answer:

Calcium is a silvery-white metal; it is relatively soft, but much harder than sodium metal. Calcium is a member of the alkaline-earth metals (Group II on the periodic table); these metals react vigorously with water, although not as violently as the Group I metals such as sodium or potassium:

Ca(s) + 2H2O(l) ——> Ca(OH)2(aq) + H2(g)

Answer 2

Answer:

$Calcium is a silvery-white metal; it is relatively soft, but much harder than sodium metal. Calcium is a member of the alkaline-earth metals (Group II on the periodic table); these metals react vigorously with water, although not as violently as the Group I metals such as sodium or potassium:</p><p></p><p>Ca(s) + 2H2O(l) ——> Ca(OH)2(aq) + H2(g)$