Science, asked by kavzsurugajayak, 1 year ago

a) Arrange the following metals in the order of their decreasing activities :
Aluminium, Gold, Sodium, Copper.
(b) Give chemical equation for the reaction of aluminium powder with manganese dioxide on heating.

CBSE Class X Science SA 2 (3 Marks)

Answers

Answered by ikrakhadim

17

(a) Sodium (Na) > Aluminium (Al) > Copper (Cu) > Gold (Au).
(b) 3MnO2(s) + 4 Al →∆ 3Mn(l) + 2Al2O3(s) + Heat

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