Question

metal 'X' does not liberate Hydrogen gas when react with acid, but when react with acid produce

black colour compound Identify 'X' and the black compound formed.

(b). The reaction of aluminum metal with compound 'X' is us to join railway tracks.

(i) Identify X and the type of reaction involved.

(ii) Write the reaction of 'X' with Al.

(c). What are amphoteric Oxides? Choose the amphoteric Oxides from the following Oxides:

Na2O , ZnO , Al2O3 ,CO2 , H2O​

Answer 1

Answer:

na20 zno ai203 h20 answer

Answer 2

Answer:

1)X is cu

2)al + cuo = alo2 + cu

3) the oxides which react with both al and zn is called amphoteric oxide zno,al2o3