Question

Name the following:
(i) The kind of elements that ionize by losing electrons.
(ii) The kind of elements that ionize by gaining electrons.
(iii) Two metals that do not get oxidized at high temperature.
(iv) Two metals that get oxidized just by exposure to air.
(v) Three metals that react with cold water to liberate hydrogen.
(vi) A metal which in the red hot state reacts with steam reversibly to produce hydrogen.
(vii) Two metals that react explosively with acids.
(viii) A metal that does not react with hydrochloric or sulphuric acid.
(ix) Two metals that dissolve only in aqua regia.
(x) Two metallic oxides that get decomposed by heat.
(xi) Two metallic hydroxides that dissolve in water to give alkalis.
(xii) Two metal carbonates which are soluble in water.
(xiii) Two metal carbonates that do not decompose when heated.
(xiv) Two metallic nitrates which yield oxygen as the only gaseous product when heated.
(xv) Two metallic nitrates when heated decompose to yield respective metals.

Answer 1

(i) The kind of elements that ionise by losing electrons are called metals.
(ii) The kind of elements that ionise by gaining electrons are called non-metals.
(iii) Least reactive metals do not get oxidised at high temperatures for example platinum and gold.
(iv) Most reactive metals get oxidised just by exposure to air for example potassium and sodium.
(v) Most reactive metals react with cold water to liberate hydrogen gas for example, potassium, sodium and calcium.
(vi) A metal, which in a red hot state, reacts with steam reversibly to produce hydrogen is iron.
(vii) Most reactive metals react explosively with acids for example potassium and sodium.
(viii) Least reactive metal does not react with hydrochloric or sulphuric acid that is gold.
(ix) Least reactive metals dissolve only in aqua regia for example platinum and gold.
(x) Two metallic oxides that get decomposed by heat are mercuric oxide and silver oxide.
(xi) Two metallic hydroxides that dissolve in water to give alkalis are potassium hydroxide and sodium hydroxide.
(xii) Two metal carbonates that are soluble in water are potassium carbonate and sodium carbonate.
(xiii) Two metal carbonates that do not decompose when heated are potassium carbonate and sodium carbonate.
(xiv) Two metallic nitrates that yield oxygen as the only gaseous product when heated are potassium nitrate and sodium nitrate.
(xv) Two metallic nitrates that when heated decompose to yield the respective metals are mercuric nitrate and silver nitrate.