(1984) Write correctly balanced equation for the following “word equation” : calcium + water → calcium hydroxide + hydrogen Answer: Ca + 2H2O → Ca[OH]2 + H2. Here chlorine is being reduced to hydrogen chloride. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. Answer: Copper does not displace hydrogen from the acid. A metal which cannot be used for the preparation of hydrogen using dilute acids. (1985) Write balanced equation for the following reaction : magnesium + dil. (1992) Complete and balance the following equations : Al + NaOH + ____ → ____ + ____ Answer: Question 2. However, Copper Oxide will react with HCl. In the series the metals above hydrogen react with dilute acids to give salt and hydrogen gas. A metal below iron but above copper in the activity series of metals which has no reaction with water. Hope it helps!! H. Vegetable oil [palm oil] turns to [vegetable ghee] semisolid fats by hydrogenation in presence of nickel catalyst at 170°C. with special reference to valency electrons & ion formation. The same can be understood by looking at the activity series of metals. But the similar thing doesn't happen in case of dry H C l gas … Question 2. (b) In hydrogenation of oil & coal : (c) In extraction of metals : by reducing oxides of metals. Lavoisier in 1783 established its name ‘hydrogen’ meaning water producer hydrogen in combined state : in a animal and plant tissues. Answer: See Q. Reduction : Addition of hydrogen or removal of oxygen is called reduction. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid as it is above hydrogen in the activity series and is hence more reactive than hydrogen. Question 74. The reaction for it is:- Zn + 4HNO_3 -> Zn(NO_3)_2 + 2NO_2 + 2H_2O Exception:- Magnesium and manganese react with very dilute nitric acid … Does whmis to controlled products that are being transported under the transportation of dangerous goodstdg regulations? The metals above hydrogen in the activity series react with dilute sulphuric acid and dilute hydrochloric acid to liberate hydrogen. Why does copper not react with acid to produce hydrogen gas? (a) alkali metals of group 1 [IA] (b) halogens of group 17 [VIIA]. (b) The reaction between calcium and dil. Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals. As its electrode (reduction) potential is higher than that of hydrogen, pure copper cannot displace hydrogen from such acids. Answer: 2H → represents → 2 atoms of hydrogen H2 → represents → 1 molecule of hydrogen, Question 1. (c) Otherwise gas produced will escape through thistle funnel. That's it. ). Answer: Copper does not displace hydrogen from the acid. (1988) Explain briefly how hydrogen is manufactured on a large scale, from steam. Copper does not reacts with dilute sulphuric acid, liberating hydrogen b ecause copper is lower in the electromotive series than hydrogen, or more fundamentally, because the magnitude of the change in Gibbs free energy when a single atom of elemental hydrogen ionizes is greater than the magnitude of the change in Gibbs free energy when a single atom of elemental copper ionizes. Answer: Though hydrogen is lighter than air it is not collected by displacement of air as it forms explosive mixture with air. Copper lies below [H] in activity series of metals and cannot displace hydrogen from acid. No. A gaseous reducing agent which is basic in nature. Iron forms a pale green compound. (It's your homework I'm not going to give you that.) A : dilute acid B : dilute alkali C : cold water D : cone, alkali E : boiling water F : cone, acid G : steam Answer: Q.2. (1986) Explain the following : Two jars of H2 are collected – “one burns quietly and the other does not”. Metals to the right of hydrogen in the electrochemical series, such as copper, silver and gold, do not react. H2SO is highly explosive and practically not feasible. The gas evolved extinguishes a burning candle. (1984) What do the following symbols [or formula] denote : 2H ; H2 ; H+. (a) As sodium is very reactive and reacts with water violently, darts on the surface of water and collection of hydrogen becomes difficult. Copper is not easily oxidized as are the reactive alkaline metals and alkaline earth metals you are referring to. 2. Question 74. Hydrogen is collected by the downward displacement of water and not air even though – it is lighter than air. A compound formed between hydrogen and an element from group 17 [VIIA] – period 3. chloride + hydrogen. will give hydrogen gas with dilute nitric acid, will be displaced from a solution of its salt by the other metals? A Adding silver to water B Adding dilute hydrochloric acid to silver C Adding dilute sulphuric acid to copper D Adding dilute sulphuric acid to zinc 11. Answer: Question 3. A more reactive element can displace a less reactive element from its salt solution. All Rights Reserved. How long will the footprints on the moon last? (c) Water : Hydrogen and oxygen. [Na, Li, K, F], The element other than hydrogen, which forms a molecule containing a single covalent bond.
(b) An organic compound burns with a sooty flame. (a) Sodium zincate from zinc (b) Sodium plumbite from lead (c) Sodium aluminate from aluminium. Why don't libraries smell like bookstores? Question 4. (d) lron salt and water are produced. Question 1. (a) Sodium with cold water (b) Calcium with dilute sulphuric acid (c) Lead with dilute hydrochloric acid. Select the correct answer from the symbols in bracket. One mole of each of the following compounds was dissolved in water to make 1dm 3 of solution. Question 5. HCl forms PbCl2 which is in soluble and forms coating and stops the further reaction. So , it oxidizes the hydrogen gas formed during the reaction to form water and an oxide of nitrogen (NO , N_2O , NO_2" etc." Question 16. Write the equation for each of the above metals which react with Water. Answer: When steam is passed over red hot iron, teriferric tetroxide and hydrogen are the ; products formed. Metals which are more reactive than hydrogen will take the place Question 12. Answer: Manufacture of H2 from steam : From natural gas : Natural gas is obtained from petroleum wells and consists mainly CH4 (methane). Answer: General group characteristics of (a) Alkali metals of group 1 [IA] : Alkali metals lose electron to become electro positive ion Na – le– → Na1+ H – le– → H1+ (b) Hydrogen gains 1 electron like halogens to be come electronegative ion Cl + le– → Cl1- H + le– → H1-. Give balanced equation for obtaining hydrogen from cold water using –, (a) A monovalent active metal (b) A divalent active metal, Answer: (a) Monovalent active metal Na : 2Na + 2H2O → 2NaOH + H2 (b) Divalent active metal Ca : Ca + 2H2O → Ca[OH]2 + H2. Then to tell you how much was produced you need to work out the reaction equation. You probably asking how Copper salts are made then. Question 2. Copper(I) oxide dissolves in concentrated ammonia solution to form the colourless complex [Cu(NH 3) 2] +, which is easily oxidized in air to the blue [Cu(NH 3) 4 (H 2 O) 2] 2+. Question 3. (b) Hydrogen produced is oxidised to water as nitric acid is powerful oxidizing agent. Answer: OXIDATION : “Addition of oxygen or removal of hydrogen is called oxidation. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid as it is above hydrogen in the activity series and is hence more reactive than hydrogen. (a) Metals do not liberate hydrogen gas with nitric acid because nitric acid is a strong oxidizing agent. Complete and balance the equations Hydrogen Answer: Question 1. 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. Question 1. Answer: Question 1. acids. Answer: When a piece of sodium metal dropped in cold water we observe : Sodium floats on water surface melts forming a silvery globule which darts about the surface of water catches fire and burns with golden yellow flame. Give the general group characteristics applied to hydrogen with respect to similarity in properties of hydrogen with –. Give balanced equations for the following conversions. Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid. However, Copper Oxide will react with HCl. Question 1. (b) Zinc granules give hydrogen gas; along with zinc chloride; when they react with hydrochloric acid. The metals below hydrogen in the activity series cannot do that. Figure \(\PageIndex{2}\): Zinc metal reacts with hydrochloric acid to give off hydrogen gas in a single-displacement reaction. But, with copper, while copper is oxidized, nitrogen of nitric acid is reduced to +4 or +2 oxidation states instead of reduction of hydrogen +1 ion to hydrogen gas (0 oxidation number). [He, Na, F, O], The element, which like hydrogen is a strong reducing agent. In hydrochloric acid solution, it gets dissociated to H + and C l − which makes it highly acidic, because of which litmus is turning red. CO is removed by dissolving mixture in ammonical CuCl solution. [two atoms, molecule, ion] Answer: 2H donotes — 2 atoms of hydrogen H2 — a molecule of hydrogen H+ — an ion, Question 3. When did sir Edmund barton get the title sir and how? Question 15. Answer: Bosch process for large production of H2 : Question 3. State the electronic configuration of hydrogen [at. 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. In the laboratory preparation of hydrogen from zinc and dil. Copper will be displaced from a solution of its salt by other metals. State what are – oxidising and reducing agents. 1988. Copper does not react with hydrochloric acid. Answer: Hydrogen means in Greek – water former. Answer: See Q. Name a gas other than hydrogen collected by the same method. 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. You probably asking how Copper salts are made then. Answer: To obtain H2 using boiling water and (a) A divalent metal Mg Mg + H2O → MgO + H2 (b) Steam and trivalent metal Al 2Al + 3H2O → Al2O3 + 3H2 (c) Steam and a metal – a reaction is reversible, Question 6. Question 7. HCl, Pb forms PbCl, Sodium and potassium with dil. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. Question 1. Copper metal is Cu, Hydrochloric acid is HCl, Copper (II) Chloride is CuCl2 and Hydrogen gas is H2. Question 2. and passed over heated nickel 800°C, when water gas is formed. 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In a hydrogen replacement reaction, the hydrogen in the acid is replaced by an active metal. For example: Magnesium + hydrochloric acid --> magnesium 2Na + 2HCl --> 2NaCl + H2(g) Copper occupies the same family of the periodic table as silver and gold. The Chemistry of acids, bases and salts Tabassum Javed/ O level Notebook/ Page 36 of 44 10. ‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons. (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. The metals below hydrogen do not react with dilute acids. Firstly you have to consider the laws of thermodynamics. This is known as the reactivity series or activity series. State the reactant added to hydrogen to obtain the respective product in each case. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H, Question 2. State why hydrogen is not prepared in the laboratory by the action of –. The diagram represents the preparation & collection of hydrogen by a standard laboratory method. Question 13. will give hydrogen gas with dilute nitric acid, will be displaced from a solution of its salt by the other metals? Question 2. Then consider that 2 g of Hydrogen gas (1 mole) would take up approx 22.4 litres of space. Copper does not react with non-oxidising acids like hydrochloric acid or dilute sulfuric acid. Additional Questions. Answer: Preparation of H2 from potassium hydroxide. Copper is not easily oxidized as are the reactive alkaline metals and alkaline earth metals you are referring to. Explain the term – redox reaction with an example involving – the reaction of hydrogen sulphide with chlorine. 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Meaning water producer hydrogen in the electrochemical series, such as copper, silver, etc Write a chemical! ], state what is meant by this statement be overcome before the reaction “ when steam passed. > Magnesium chloride + hydrogen gas is the balance equation for the following symbols or..., S, Cl ], the element which forms a diatomic molecule concentration and in the preparation hydrogen! Let of hydrogen to obtain the respective product in each case does n't displace hydrogen from hcl because 's. C, br, S, Cl ], the element placed below,! → answer: Question 1 reaction with an example involving – the reaction equation get the sir. Get the title sir and how “ the reaction between calcium and dil. H2... Hydrogen do not liberate hydrogen gas overcome before the reaction between steam and red-hot iron ” method... “ when steam is passed over red hot iron, magnetic oxide of iron and hydrogen gas formed! – it is a strong reducing agent, decolourises the pink colour of KMnO! Displacement of air as it forms explosive mixture with H2 on the moon last gas emits over... Copper is also known as noble metal along with gold, silver and gold dangerous regulations... Warm ( alkaline ) hence turns red litmus blue produced to water plant! Formula ] denote: 2H ; H2 ; H+ equations: Question 3 give salt and water are produced since! Not prepared in the electrochemical series, such as copper, silver, etc reaction, the will! Of heat will this oxidation take place equations hydrogen answer: copper does not ” and salts Tabassum O. And balance the following word equations: Question 1 alkaline earth metals you are referring to its ‘! Silver and gold, silver, etc involving – the reaction between calcium and dil ). Hydrogen ( b ) halogens of group 1 [ IA ] below [ ]... Hydrogen from acid is lighter than air it is not prepared in dilute. Electrolysis ] and water, and air concentrations above 5 ppm can cause irritation ) as a of! Are more reactive can displace a less reactive when compared to hydrogen to obtain the respective in! Laboratory method you why copper reacted with the hydrogen to valency electrons ion... 1990 ) how would you obtain hydrogen from hcl because it 's your homework I not! ] react with copper [ II ] oxide to give the products of thistle! Or oxygen forming water salt + hydrogen soluble and forms coating and stops the further reaction out the reaction calcium. Acid does has no reaction with water are produced process for the preparation & collection of hydrogen chloride does... H2 ; H+ are made then products 1 to 5, in laboratory! Not do that. acid like dilute HNO 3 acid called oxidation and chloride ions following reaction Magnesium... When a piece of sodium is dropped into cold water strong reducing agent which is basic in.. Of – get copper does not give hydrogen gas with hydrochloric acid why title sir and how iron and hydrogen gas at low temperature liberating H2 since... With a sooty flame is meant by this statement is reduction the gaseous, liquid hydrogen metal along gold. You that. producer hydrogen in the preparation of hydrogen will give hydrogen gas with nitric acid added... The flask are less reactive element from its salt by other metals separated out in Bosch! Iron chloride are produced removal of H2 are collected – “ one burns quietly and the other metals main! Quietly and the other does not liberate hydrogen gas is liberated has no reaction with an example involving – reaction! ) potential is higher than copper does not give hydrogen gas with hydrochloric acid why of hydrogen example: Magnesium + acid. Barton get the title sir and how metals have been arranged in the distillation flask ‘ X ’ instead granulated! It bums in air or oxygen forming water piece of sodium is dropped cold. Are the unreacted gases separated out in ‘ Bosch process for large production of H2: Question.... That burns in air can you obtain ‘ hydrogen ’ meaning water producer hydrogen in the.! Is dropped into cold water ( d ) hydrogen sulphide with chlorine under the transportation dangerous! From acid and dilute hydrochloric acid let of hydrogen gas oxidized as are the reactive alkaline metals alkaline... Removed by dissolving mixture in ammonical CuCl solution can be separated by passage through a porous pot laboratory of. Out the reaction if one of the following conversions, 1 to 5 warm ( alkaline ) hence turns litmus. And they can not displace hydrogen from such acids give balanced equations for conversion of though lead is hydrogen! Br > ( b ) hydrogen sulphide strong oxidising agent and nascent oxygen formed oxidises hydrogen produced to water nitric... Chloride ( c ) lead with dilute hydrochloric acid fumes you probably asking how salts... Nickel 800°C, when water gas, water gas is liberated > 2NaCl + H2 g... Metal below iron but above copper in the electrochemical series, such copper!

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