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Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as haematite contain iron(III) oxide, Fe2O3. The oxygen must be removed from the iron(III) oxide in order to leave the iron behind. Carbon is more reactive than iron, so it can displace iron from iron(III) oxide. Here are the equations for the reaction:
Iron(III) oxide + carbon → iron + carbon dioxide
2Fe2O3(s) + 3C(s) → 4Fe(l) + 3CO2(g)
In this reaction, the iron(III) oxide is reduced to iron, and the carbon is oxidised to carbon dioxide.
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Vaccines work on the principle of immunization. Vaccines help a body's immune system prepare in advance to fight infectious illnesses and potentially deadly diseases caused by infectious agents or their by-products. Vaccines ‘fool’ the immune system into developing a memory for a particular infection by putting something that mimics the microbe we want to vaccinate against, into the body.
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8x + 4 = 3(x – 1) + 7
∴ 8x + 4 = 3x – 3 + 7
∴ 8x + 4 = 3x + 4
∴ 8x – 3x = 4 – 4 . . . . [Transposing 3x to L.H.S. and 4 to R.H.S.]
∴ 5x = 0
∴ {tex}x = \frac{0}{5}{/tex} . . . . [Dividing both sides by 5]
∴ x = 0 this is the required solution.
Verification
L.H.S. = 8x + 4 = 8(0) + 4 = 4
R.H.S. = 3(x – 1) + 7 = 3(0 – 1) + 7 = 3(–1) + 7 = –3 + 7 = 4
Therefore, L.H.S = R.H.S
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Gaurav Seth 6 years, 7 months ago
1Thank You