Question

The cost of 49 pens and 51 pencils is 499 Rs where pens and 49
pencils cost in 501 Rs Then find the cost of 20 pens and 40 pencil
​

Answer 1

Answer:

Iron(III) oxide (Fe

2

O

3

) reacts with aluminium(Al) to form aluminium oxide(Al

2

O

3

) and molten iron(Fe). This is a displacement reaction as aluminium displaces iron in iron(III)oxide to form aluminium oxide. Also it is a redox reaction as both oxidation of aluminium and reduction of iron is taking place. The equation can be written as:

2Al(s)+Fe

2

O

3

(s)→Al

2

O

3

(s)+2Fe(l)+heatA teacher takes a hand opens a mind and touches a heart explain this in the context of Helen keller's lifeMYN28WS2T