Ans . As copper does not react with dilute sulphuric acid. 25. 26. (c) 27. Copper does not react with dilute sulphuric acid because of its positive reduction potential. asked Oct 17, 2019 in Science by Suchita ( 66.3k points) cbse State the reason for the following: (i) Hydrogen gas is not evolved when most metals react with nitric acid. Dilute sulfuric acid will not attack tin or copper. Thus, copper metal will not react with dilute sulphuric acid or with hydrochloride acid, HCl, but it reacts with nitric acid … Beryllium is a good example. Magnesium hydroxide and oxide are both basic and will therefore react with dilute sulphuric acid to form magnesium sulphate. When a metal react with dilute nitric acid,then hydrogen gas is not evolved.Nitric acid is a strong oxidising agent.As soon as hydrogen gas is formed in reaction between metal and dilute nitric acid,the nitric acid oxidises this hydrogen to water.Nitric acid itself is reduced to nitrogen oxides such as nitrogen monoxide,dinitrogen monoxide. 011-47340170 . But sulphuric acid is a strong oxidising agent, therefore it will oxidise copper metal to Cu 2+ ion. The reaction is similar to the reaction with water, forming the metal salt (either sulfate or chloride) plus H 2(g).. For example. However, no hydrogen gas will be formed, only copper metal will be oxidised here. Copper does not displace hydrogen from non-oxidising acids like HCl or dilute H2SO4. 25. Two metals, M 1 and M 2 are found to show the following properties: (i) M 1 liberates H 2 when it reacts with dil. Copper does not react with dilute sulphuric acid as its reduction potential is higher than that of hydrogen. iron + sulphuric acid → iron(II) sulphate ... For example, magnesium does not react readily with liquid water but reacts readily with gaseous steam. The Reactivity Series. This is because a layer of aluminium oxide forms on the surface of the aluminium due to prior reaction with the air and acts as a protective barrier. metal + sulphuric acid → metal sulphate + hydrogen e.g. Aluminum, which is a highly reactive metal, will not dissolve in oxidizing acids (e.g. The reaction of lead with acids is slow. Sulfuric acid -when concentrated- reacts with metals as an oxidising agent. But when concentrated sulphuric acid is poured over copper plate, effervescence is observed. Answer: (a) Metals are malleable and ductile i.e. However, the material's resistance to sulphuric acid decreases. sulphuric acid through redox reaction. When we cool the concentrated sulphuric acid it does not react with such metals like iron and copper. I also found that zinc doesn't react noticeably with acetic acid, unlike magnesium, but I'm not sure I want to deal with the vinegar smell. On burning metals react with oxygen to produce-a. Identify the non-metal which exists in liquid state in room temperture 25 ∘ C. A. Aluminium. METALS AND NON-METALS. Copper is close to the bottom of the list, meaning copper has very little reactivity. (a) Sulphurous acid is stronger than Sulphuric Acid (b) Sulphuric Acid is stronger than Sulphurous acid. Copper stabilizes the passive film on the surface of the steel. The surface of this metal has a thin oxide layer that helps to protect it when it is exposed to acid. This explains the weight loss of jewelry. (c ) Sulphuric Acid and Sulphurous acid are equal in strength. But if the sulphuric acid is hot and concentrated, then it can undergo reduction. However a hot concentrated solution of sulfuric acid will react with tin (and copper). Zinc + sulfuric acid zinc sulfate + hydrogen gas. Copper, on the other hand, is below H in the activity series, which allows us to predict that Cu metal won't react with H+. Metals like sodium, magnesium, zinc and iron can react with sulphuric acid. Copper + Sulphuric acid à Copper sulphate + Hydrogen gas Q2. Metals below that can only displace hydrogen from acids, and metals below THAT cannot displace hydrogen at all. (ii) Both M 1 and M 2 react with chlorine to form (M 1)Cl 2 and (M 2)Cl 2 respectively. (a) 26. It is so potent that it even dissolves gold and silver. Metals above H in the activity series are able to be oxidized by H+ ions, and in the process, reduce H+ to H2 gas. The presence of copper in superaustenitic stainless steels provides general corrosion resistance in sulphuric acid. nitric), as it will grow on its surface a protective layer of aluminum oxide. D. Bromine. 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