Q88 of 400 Page 135

Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?

CuSO4+Fe is the pair of reactants can undergo a displacement reaction under appropriate conditions.

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86 Which of the following metal exists in the liquid state? 87 Which of the following non-metal is a liquid? 89 An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.

(a) What is the nature of the oxide E2O?


(b) State whether element E is a metal or a non-metal.


(c) Give one example of an element like E.

 90 Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.

(a) What is the nature of oxide A2O3?


(b) What is the nature of oxide BO?


(c) Name one metal like A.


(d) Name one metal like B.