Which of the following statements(s) is/are correct
i. Strontium amide, Sr(NH2)2,is a weak base.
ii. Dichromic acid H2Cr2O7 is a strong acid.
iii. Potassium oxide, K2O, is a strong base
A. i only
B. ii only
C. iii only
D. i and iii
E. ii and iii
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