Q98 of 400 Page 136

If A, B1 C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?

If A, B1 C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, then K is most likely to occur in a free state in nature.

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96 Which of the following reactions will not occur ? Why not?

(a) MgSO4 (aq) + Cu (s) → CuSO4 (aq) + Mg (s)


(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)


(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg (s)

 97 In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals? 99 Name a metal for each case:

(i) It does not react with cold as well as hot water but reacts with steam.


(ii) It does not react with any physical state of water.

 99 When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?