Answer:
(B). 0.5
Step-by-step explanation:
No. of equivalents : Mass/equivalent mass ---{1}
Mass given to us is 10g. hence we need to find equivalent mass of Ca2+...
eq mass = Molar mass/valence factor = 40/2 = 20 ---{2}
since valence factor(or 'n' factor) is 2, and molar mass is 40
putting value of eq mass from {2} to {1},
we get,
No. of equivalents : 10/20 = 0.5