Q47 of 65 Page 24

A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.

Mercury is the only metal that exists as liquid at room temperature. It is placed low in reactivity series and can be obtained by reducing their sulphides or oxides by heating. It can be obtained by heating the sulphide ore of mercury called cinnabar (HgS).


The reactions are as follows:
2HgS + 3O2 → 2HgO + 2SO2
2HgO → 2Hg + 0


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A metal A, which is used in thermite process, when heated with oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with HCl and NaOH.

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Give the formulae of the stable binary compounds that would be formed by the combination of following pairs of elements.

(a) Mg and N2


(b) Li and O2


(c) Al and Cl2


(d) K and O2

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What happens when

(a) ZnCO3 is heated in the absence of oxygen?


(b) a mixture of Cu2O and Cu2S is heated?