How are zinc , magnesium , iron are available in food although they are metals ?

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Solution

These minerals are present in soil. From soil they are taken up by plants. So, they are present in plant products like green leafy vegetables, nuts, legumes, cereals, fruits, beans, etc. Animals get these minerals by consuming plant products. Human beings get these minerals through plant products as well as animal products like iron from liver, zinc from yoghurt.

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Q. Which sequence indicates correctly the increasing reactivity of metals?
(a) iron, zinc, magnesium, sodium, potassium
(b) sodium, potassium, magnesium, zinc, iron
(c) magnesium, potassium, sodium, iron, zinc
(d) iron, zinc, sodium, magnesium, potassium

The two metals which are extracted by means of electrolytic reduction of their molten salt are:
(a) magnesium and manganese (b) iron and aluminium
(c) zinc and magnesium (d) magnesium and aluminium

Q. Choose the reactions which are not feasible.
I. Iron + Zinc sulphate

\to

Iron sulphate + Zinc
II. Magnesium + Silver nitrate

\to

Magnesium nitrate + Silver
III. Copper + dil. sulphuric acid

\to

Copper sulphate +

H_{2}

IV. Zinc + Ferrous sulphate

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Iron + Zinc sulphate

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On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions:

Metals: magnesium, zinc, copper, iron, and potassium

Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate

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