0.499g 0f CuSO₄.xH₂O when heated to constant weight gave a residue of 0.346g. the value of x is? (Cu = 63.5, S = 32.0, O = 16, H = 1)

• A 0.5
• B 2.0
• C 3.0
• D 4.0
• E 5.0