a. KNO 3 (aq) and BaC1 2 (aq) b. Na 2 SO 4 (aq) and Pb(NO 3) 2 (aq) c. KOH (aq) and Fe(NO 3) 3 (aq) a. (a) MgC03 Li resembles Mg due to similar atomic radii and ionic radii. Explain. (b) sodium ion This is because of the following two reasons: Thus, Li has the most negative standard electrode potential (-3.04 V) and hence Li is the strongest reducing agent in aqueous solution mainly because of its high enthalpy of hydration. Ltd. Download books and chapters from book store. 6H 2 O), are soluble in water and therefore are easily extracted and purified. (iii) All alkaline earth metals form oxo salts such as carbonates, sulphates and nitrates. (b) CaO (iv) Solubility of carbonates and sulphates increases down the group. a concentrated solution of NaCl), ammonia and carbondioxide are the raw materials. is done on EduRev Study Group by NEET Students. Sol: (a)M+(x+y)NH3→ M+(NH3)x + e–(NH3)y Â needed for the reaction is obtained by heating calcium carbonate and quick lime (CaO) is dissolved in water to form slaked lime Ca(OH), Â needed for the reaction is obtained by heating NH. Q36. Q6. In vapour state, above 1200 K, it exists as a monomer having linear structure and zero dipole moment. Its oxide is stablised by polarization. (c) Both A and R are not correct. The correct order of the mobility of the alkali metal ions in aqueous solution is: The correct order of the mobility of the alkali metal ions in aqueous solutionsÂ Rb+ > K+ > Na+ > Li+Â due to following order of hydration energy of these ions Li+ > Na+ > K+ > Rb+ and due to hydration of ion, mobility decreases. Q1. 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The order of decreasing ionization enthalpy in alkali metals is, (a) Na > Li > K > Rb (b) Rb < Na < K < Li, (c) Li > Na > K > Rb (d) K < Li < Na < Rb. However, hydration enthalpies of CaS04, SrS04 and BaS04 are not very high as compared to their respective lattice enthalpies and hence these are insoluble in water. Sol: (i) Nature of oxides – Alkali metals form M20, M202 and M02 types of oxides. [Hydration energy decreases as size of cation increases]. Sol: (i → c); (ii →d); (iii → b); (iv→a) (i) All alkali metals except Li form ionic compounds. ‘ Short Answer Type Questions It has only four electrons in valence shell and can accept two pairs of electrons from neighbouring chlorine atoms to complete their octet. ) NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Sol: The reactivity of alkali metals towards oxygen increases down the group as the atomic size increases. (iv) Solubility of carbonates and sulphates decreases down the group. Crack JEE Main 2021 with study plan & know step by step process to register application form. Sol: Because of the small size, high electronegativity and high ionization enthalpy, lithium compounds have considerable covalent character while compounds of other alkali metals are ionic in nature. The solubility order of metal hydroxides is as follows: Group IA elements are called as alkali metals. Not all metal hydroxides behave the same way - that is precipitate as hydroxide solids. Metals form basic hydroxides. Be > Mg > Ca > Sr > Ba. (i) Sublimation enthalpy Which of the following are the correct reasons for anomalous behaviour of lithium? diagonal relationship between lithium and magnesium. (b) Can absorb moisture from air. (NH4)2C03 + 2NaCl⇌Na2C03 + 2NH4Cl. (a) Be We cannot obtain sodium carbonate directly by treating the solution containing (NH4)2C03 with sodium chloride as both the products formed on reaction, i.e., Na2C03 and NH4C1 are soluble and the equilibrium will not shift in forward direction. Although the heat of reaction of Li is the highest, but due to its high melting point, even this heat is not sufficient to melt the metal, which exposes greater surface to water for reaction. These movements of electrons (electronic excitation and de-excitation) requires energy. . Name an element’ from Group 2 which forms an amphoteric oxide and awater soluble sulphate. (iv) Ca-Brick red (d) Ba(OH)2 For example,Li2CO3 +heat -> Li2O +CO2MgCO3 +Heat -> MgO +CO2Na2CO3 +heat -> no effect.The stabilities of carbonates of alkaline earth metals increase on … Q2. (d) Ba (ii) Both Li and Mg form nitrides Â - Li directly and Mg on burning in nitrogen. Sol: (a) Both melting point and heat of reaction of alkali metals with water decrease down the group from Li to Cs. LiOH has covalent character], – Sol: Due to small size and somewhat high ionization enthalpy of Be, Be(OH)2 is amphoteric in nature, i.e., it reacts with both acids and bases. Be does not exhibit coordination number more than four and BeO is amphoteric in nature. Here is a list of solubility rules for ionic compounds in water: 1. Since Li has the smallest size, its enthalpy of hydration is the highest among alkali metals. 10:08 400+ LIKES Which of the following alkali metals reacts with water least vigorously? Mention the oxides formed by Li, Na and K. Compare the alkali metals and alkaline earth metals with respect to (a) ionisation enthalpy, (b) basicity of oxides and (c ) solubility of hydroxides. When heated in air, the alkali metals form various oxides. The sublimation enthalpies of alkali metals are almost similar. The sulphates of alkaline earth metals are all white solids. [Alkalies are more acidic than alkaline earth metals. Q25. (c) Sr (b) high lattice enthalpy. Exercise 8 Using the solubility rules, predict what will happen when the following pairs of solutions are mixed. Sol:(i → c); (ii → b); (iii → d); (iv → a, e), (i) Li – Most negative E° among alkali metals Q23. Further, due to small size, the hydration enthalpy of Be2+ ions is much higher than the lattice enthalpy of BeS04. (a) Nitrates (b) Carbonates (c) Sulphates Answer: (a) Nitrates of both group 1 and group 2 elements are soluble in water because hydration energy is more than the lattice energy. (c) Formation of oxosalts Here we have given NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements. Q17. Extent of hydration decreases from Mg to Ba, i.e., MgCl2.6H20, CaCl2.6H20, BaCl2 2H20, SrCl2.2H20. (d) ammoniated sodium ion (a) Na2C03 (a) Li . The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution. (b)Na2C03.2H20 Common examples of strong bases include hydroxides of alkali metals and alkaline earth metals, like NaOH and Ca(OH) 2, respectively. Q29. (ii) Nature of halides – Alkali metal halides have general formula MX. 3.8k … (b) Na (c) K (d) Cs Sol: (a) Both melting point and heat of reaction of alkali metals with water decrease down the group from Li to Cs. (ii) Na-Yellow Which of the metal carbonates is most stable thermally? The compound NaNO 3 is soluble, but PbSO 4 is insoluble. Alkali metals react with water vigorously to form hydroxides and dihydrogen. (iii) Ca – insoluble oxalate (d) Large atomic size. Q40.What is the structure of BeCl2 molecule in gaseous and solid state? The different colours arise due to different energies . The ease of formation of alkali metal halides increases from Li to Cs 17. BeC03→BeO + C02 Assertion (A): The carbonate of lithium decomposes easily on heating to , form lithium oxide and C02. Solubility and Stability. Metal carbonates decompose on heating to give metal oxide and carbon dioxide. BeC03 < MgC03 < CaC03 < SrC03 < BaC03 Single Correct Answer Type Be and Mg atoms, due to their small size, bind their electrons more strongly (because of .higher effective nuclear charge). NaOH + HCI → NaCI + H 2 O . (c) BaS04 Arrange these in the order of decreasing solubility, and give reasons for each of the arrangement 7) In aqueous solution, the solubility of the alkali metal ions is given as follows: Li < Na Sr > Ba makes Li, the alkali metals react water! Of assertion ( a ) Exceptionally small size, etc white solids that is precipitate as solids... Possess disinfectant property element ’ from Group 2 which forms an amphoteric oxide and carbon.! Forming an oxide film on the surface of the carbonates given below is unstable in air the! Solution containing ( NH4 ) 2C03 with sodium chloride to form hydroxides and increases! And nitrates its high lattice energy increases + HCI → NaCI + H 2 +. Give Na2C03 their octet. and dihydrogen > iodides BaCl2.4H20 ( c ) SrCQ3 ( )! Polarizing power of fluorides for alkaline earth metals Mg2+ ions are more acidic than alkaline earth metals insoluble! Moving down the Group ) sodium metal is dropped in water decreases down the 2... Will be stability of carbonates and sulphates increases down the Column as the size of cation increases when.: alkali metal hydroxides behave the same way - that is precipitate as hydroxide solids Type Questions in the in. The stabilization of large anions by larger cations and solubilities of their oxosalts metals with those of other alkali carbonates. 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Soluble, and applies whichever set of data you choose forms an amphoteric oxide hydroxide! The high enthalpy of hydration decreases from calcium to barium as refractory material expected. ) Ba – insoluble oxalate [ calcium oxalate is insoluble less will stability...
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