Question 1. Answer: Question 2. That's it. What happens when dilute hydrochloric acid is added to iron fillings? The diagram represents the preparation & collection of hydrogen by a standard laboratory method. (1987) Write correctly the balanced equation for the following : ‘When zinc filings are added to a concentrated solution of sodium hydroxide’. Zinc reacts with hydrochloric acid to produce hydrogen gas because it's more reactive than hydrogen, and thus displaces the latter from an acid. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H, Question 2. Copper doesn't displace hydrogen because copper has a higher standard electrode potential than hydrogen. (1992) What do the following symbols represent : 2H and H2. This is due because energy barriers have to be overcome before the reaction can take place. Here chlorine is being reduced to hydrogen chloride. (c) With lead dil. Answer: Use of hydrogen : (a) As a fuel in the form of coal gas, water gas, liquid hydrogen. Cu + … In the series the metals above hydrogen react with dilute acids to give salt and hydrogen gas. (CC BY-NC; CK-12) Some metals are so reactive that they are capable of replacing the hydrogen in water. of hydrogen to form a salt + hydrogen gas. Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid. Question 5. Question 8. Question 16. x Do all metals react with acid to produce hydrogen gas? From which reaction a gas is produced? Copper metal is Cu, Hydrochloric acid is HCl, Copper (II) Chloride is CuCl2 and Hydrogen gas is H2. Tick the correct answer. Write the equation for each of the above metals which react with Water. (1984) Write correctly balanced equation for the following “word equation” : calcium + water → calcium hydroxide + hydrogen Answer: Ca + 2H2O → Ca[OH]2 + H2. Cu … Iron forms a pale green compound. Hydrogen initially called inflammable gass that it bums in air. So, as soon as hydrogen gas is formed in the reaction between a metal and dilute nitric acid, the nitric acid oxidisesthis hydrogen to water. Metal + dil. (a) alkali metals of group 1 [IA] (b) halogens of group 17 [VIIA]. Assertion A: Copper does not liberate hydrogen from the solution of dilute hydrochloric acid. Answer: Combustibility of : (a) Pure hydrogen : Bums quietly in air with a pale blue flame forming water 2H2 + O2 → 2H2O (b) Hydrogen air mixture : It explodes on burning. (1986) Name a gas which burns in air or oxygen forming water. Give the general group characteristics applied to hydrogen with respect to similarity in properties of hydrogen with –. How did the name ‘hydrogen’ originate. Name a gas other than hydrogen collected by the same method. Answer: See Q. Copper fall below hydrogen … (1994) Why is copper not used to prepare hydrogen by the action of dilute hydrochloric acid or dilute sulphuric acid on the metal, [copper [Cu] below hydrogen – no reaction] Answer: Cu is below hydrogen in reactivity series and cannot displace H2 from acid and no-reaction takes place. Question 4. hydrochloric acid → Answer: Mg + 2HCl (dil.) When did sir Edmund barton get the title sir and how? Answer: OXIDATION : “Addition of oxygen or removal of hydrogen is called oxidation. (b) Zinc granules give hydrogen gas; along with zinc chloride; when they react with hydrochloric acid. As a constituent of : proteins, carbohydrates, fats, acids, alkalis, petrolium products and organic substances. Copper on the other hand cannot displaces hydrogen from hydrochloric acid as it is located below hydrogen in the activity series and is hence less reactive than hydrogen. Standard laboratory method dilute hcl acid like dilute HNO 3 acid Reaction. what. 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