NTSE Stage 2 SAT 2014 Question Paper

Above reaction is a neutralization reaction because acid and base react to transform water and salt . Here combination of H+ ions and OH− ions involve.
(b) 2AgBr→Ag+Br2,this reaction is a photochemical reaction which take places in the presence of light.
This reaction is used in photographic process
(c) In reaction ZnCO3→ZnO+CO2,thermal decomposition occurs.
(d)

2Al

(s)

+

Fe2O3

(s)

→

2Fe

(s)

+

Al2O3

(s)

The reaction of iron oxide and aluminium is an example of thermite reaction, this reaction is used in welding and preparation of metal from their oxides.