The elements whose oxides can turn litmus solution red are :

77 An element X forms two oxides XO and XO₂. The oxide XO is neutral but XO₂ is acidic in nature. The element X is most likely to be : 78 The elements whose oxides can turn litmus solution blue are: 80 Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide : 81 A metal less reactive and another metal more reactive than hydrogen are :