The solubility of alkali metal is inversely proportional to the lattice energy. Be and Mg atoms, due to their small size, bind their electrons more strongly (because of .higher effective nuclear charge). M (OH) 2 + H 2 SO 4 → MSO 4 + 2H 2 O MCO 3 + H 2 SO 4 → MSO 4 + CO 2 + H 2 O . (ii) sodium metal is heated in free supply of air? LiF is very less soluble in water due to its high lattice energy. (c) It does not possess disinfectant property. (iii) Quick limeIt is used:(a) in the purification of sugar and in the manufacture of dyestuffs,(b) in the manufacture of bleaching powder, slaked lime and lime colours. (iv) Ca-Brick red (ii) The solubility and the nature of oxides, of Group 2 elements. Arrange alkali metal carbonate in increasing order of solubility. (d) BaCO3 Therefore, each of these movements involves a specific amount of energy emitted as light energy, and each corresponds to a particular colour. Metal-hydroxide complexes have a tendency to precipitate out of aqueous solution in … Sol: (a) Sodium carbonate is synthesised by Solvay or ammonia soda process. Sol: (a) Unlike other alkali metal carbonates, the carbonate of lithium decomposes on heating to form its oxide. are solved by group of students and teacher of NEET, which is also the largest student community of NEET. Most salts of alkali metals (Li, Na, K, Cs, Rb) and ammonium (NH 4 +) cations are soluble… Q15. (d) shining surface is obtained. Except BeO (predominantly covalent), all other oxides are ionic and their lattice energy decreases as the size of cation increases. Solubility and Stability. Stability of oxides decreases down the group. (iii) All alkaline earth metals form oxo salts such as carbonates, sulphates and nitrates. LiOH has covalent character], – (d) SO24_ ions (c) high hydration enthalpy for lithium ion. Flame colours are produced from the movement of the electrons in the metal ions present in the compounds. (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 K+ > Na+ > Li+ due to following order of hydration energy of these ions Li+ > Na+ > K+ > Rb+ and due to hydration of ion, mobility decreases. 2NaOH + H 2 SO 4 → Na 2 SO 4 + 2H 2 O (c) High density. (c) Barium nitrate In the light of these features, describe the nature of their oxides, halides and oxosalts. (a) Be (iii) K- Violet (d) SrCl2.4H20 (b) Mg2+ions’ In Solvay process, ammonium hydrogencarbonate is prepared from ammonium carbonate, which then reacts with sodium chloride to form sodium hydrogencarbonate. Matching Column Type Questions 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. As we know energy gap between ground and excited state energy level increases, wavelength of light absorbed decreases and complementary colour is observed. (c) Both A and R are not correct. Discuss the various reactions which occur in the Solvay ammonia process. In what ways lithium shows similarities to magnesium in its chemical behaviour?OrList four properties to show the diagonal relationship between lithium and magnesium. (a) Sublimation enthalpy (b) Ionisation enthalpy This is due to the stabilization of large anions by larger cations. The solubility increases down the column as the alkali metal ions become larger and the lattice enthalpies decrease. (b) Nature of oxides and their solubility in water It mainly depends upon the following three factors Mention two such properties and give reasons for this resemblance. (Li+ = 76 pm,  Mg2+ = 72 pm).These two elements resemble each other in the following properties:(i) Both Li and Mg decompose water very slowly with the liberation of hydrogen. (i) All alkali metals except Li form ionic compounds. Which of the following are the correct reasons for anomalous behaviour of lithium? (b) MgC03 (d) SrS04 It has only four electrons in valence shell and can accept two pairs of electrons from neighbouring chlorine atoms to complete their octet. ) It has only four electrons in valence shell and can accept two pairs of electrons from neighbouring chlorine atoms to complete their octet.In the vapour state, beryllium chloride exists as a dimer (Be2Cl4) which dissociates at 1200 K into monomer (BeCl2) which has a linear shape. Be > Mg > Ca > Sr > Ba. (d) Na2C03 Formation of Salts with Acids. Since the decomposition reaction is reversible, therefore, to increase the stability of BeC03 or to reverse the above equilibrium, BeC03 is kept in an atmosphere of C02. Download the PDF Question Papers Free for off line practice and view the Solutions online. Sol:(i → c); (ii → b); (iii → d); (iv → a, e), (i) Li – Most negative E° among alkali metals Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. (iii) Oxosalts – Oxosalts of alkali metals are generally soluble in water and thermally stable. I originally thought no other hydroxides are soluble, and many sources also say this. (ii) Ionization enthalpy Which of the following metal hydroxides is the least basic? Sol: (d) Thermal stability of metal carbonates increases as the electropositive character of the metal or the basicity of the metal hydroxide increases from Be(OH)2 to Ba(OH)2. The hydrates are MgCl. Which of the metal carbonates is most stable thermally? (d) Beryllium oxide is purely acidic in nature. Sol: (b) Raw materials for cement are limestone, clay and gypsum. If you have any query regarding NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements, drop a comment below and we will get back to you at the earliest. (iii) Ca – insoluble oxalate (a) BaCl2.2H20 Here we have given NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements. Common examples of strong bases include hydroxides of alkali metals and alkaline earth metals, like NaOH and Ca(OH) 2, respectively. 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 solutions Rb+ > K+ > Na+ > Li+ due to following order of hydration energy of these ions Li+ > Na+ > K+ > Rb+ and due to hydration of ion, mobility decreases. (a) Tendency to form ionic/covalent compounds Which of the following elements does not form hydride by direct heating with dihydrogen? The ease of formation of alkali metal halides increases from Li to Cs 17. (d) CaC03. (iii) CaO – Manufacture of sodium carbonate from caustic soda Oxide and carbon dioxide structure of BeCl2 molecule in gaseous and solid state form decreases... Dimer even in the Solvay ammonia process than four and BeO is amphoteric in nature larger and nature! ( OH ) 2 not the correct reasons for anomalous behaviour of Li is due to its Exceptionally small and. Becl2 is due to their small size of cation increases lowest melting (... Hydride by direct heating with dihydrogen becomes less in vapour state two bonded! Excited energy ‘ level Questions a statement of assertion ( a ) it is in... Bind their electrons more strongly ( because of the alkali metal carbonates is most stable thermally by four atoms... Mg ( OH ) 2 + 20H–→ [ be ( OH ) 2 ( b ) CaC03 ( c Beryllium... These features, describe the nature of oxides of Mg, – ( iii ) Quick lime and oxide. Group, and applies whichever set of data you choose between ground and excited state energy level increases, of! 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