Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide :

78 The elements whose oxides can turn litmus solution blue are: 79 The elements whose oxides can turn litmus solution red are : 81 A metal less reactive and another metal more reactive than hydrogen are : 82 An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be :