A zone between 105° and 140° from the epicentre is identified as the shadow zone for P and S waves because-
1. Generally, seismographs located at any distance within 105° from...
Beryllium oxide (BeO) is an amphoteric oxide and thus, it reacts with both acid (HCl) as well as base (NaOH) to give the corresponding products.
i. BeO + 2HCl ⟶ BeCl2 + H2O
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