Be does not react with water even at higher temperature where as other metals do. To read more, Buy study materials of S- Block elements comprising study notes, revision notes, video lectures, previous year solved questions etc. Also browse for more study materials on Chemistry here. Question 2: Which of the following statements is incorrect? Hydration energy varies inversely with the size and in sulphates of alkaline earth metals lattice energy remains almost constant. I … It is very slightly soluble in water imparting an alkaline reaction to the solution. This basic strength increases as we move down the group. Halides of Alkaline Earth Metals Fluorides are insoluble in water. The melting and boiling points decrease down the group with the exception of magnesium. Both do not impart any colour to the flame. Expect BeO all other oxides are extremely stable ionic solids due to their high lattice energies. It is a deliquescent solid which is a by-product of Solvay’s process. Slaked lime being a strong base reacts with acids and acidic gases forming salts. Properties of Halides of Alkali Earth Metals. Media Coverage | The resulting anhydrous CaSO4 is called dead burnt plaster because it does not have the properties of setting with water. Thus BeSO4 and MgSO4 are highly soluble, CaSO­4 is sparingly soluble but the sulphates of Sr, Ba and Ra are virtually insoluble. Question 4: Which of the following halides do not impart colour to the flame? The temperature of decomposition of these sulpahtes increases as the basicity of the hydroxide of the corresponding metal increase down the group. The latter losses water, becomes anhydrous above 200°C and finally above 400°C, it decomposes into calcium oxide. All the elements of group 2 combine with halogens at high temperature and form their halides (MX. The basic strength, however, increases from Be to Ba as the ionisation energy of metal decreases down the group thus the order: The basic character of hydroxides of group-2 elements is lesser than those of group-1 hydroxides because of the larger size elements of latter than former group. Email, Please Enter the valid mobile (7.1) a. element in baking soda that turns a flame yellow b. metallic element found in limestone c. radioactive alkali metal 34. Except of BeCl2 and MgCl2, the other chlorides of alkaline earth metals impart characteristics colour to flame. decreases. It is prepared as a white powder, known as precipitated chalk, by dissolving marble or limestone in hydrochloric acid and removing iron and aluminium present by precipitating with NH3, and then adding ammonium carbonate to the solution; the precipitate is filtered, washed and dried. It is extracted by the electrolysis of a fused mixture of calcium chloride and calcium fluoride (lowers the fusion temperature of the electrolyte). RD Sharma Solutions | 207, Laxmideep Building Plot No. It is a colourless, deliquescent salt, highly soluble in water. Examples: MgSO4.7H2O, ZnSO4.7H­2O, FeSO4.7H2O. It main industrial uses are. BeCI2 + 2H2O → Be (OH)2 + 2HCI. Thus, Be, Mg and Ca when heated with O. form monoxides while Sr, Ba and Ra form peroxides. It measured in either, grams or moles per 100g of water. Oxides and hydroxides of both are amphoteric in nature. This is due to the fact that the lattice energy decreases down the group due to increase in size of the alkaline earth metals cation whereas the hydration energy of the cation remains almost unchanged. Thus BeSO 4 and MgSO 4 are highly soluble, CaSO ­4 is sparingly soluble but the sulphates of Sr, Ba and Ra are virtually insoluble. Solubility is the maximum amount a substance will dissolve in a given solvent. The magensite ore is powdered and dissolved in dilute H2SO4. Be(OH)2 and Mg(OH)2 being insoluble are obtained from suitable metal ion solutions by precipitation with OH- ions. The alkaline earth metals combine directly with halogen at appropriate temperature forming halides MX2. Solubility: The solubility of the sulphates in water decreases down the groups i.e. Biological Importance of Magnesium and Calcium... About Us | Like alkali metals, these dissolve in liquid ammonia giving coloured solutions. It is prepared by precipitating a solution of calcium chloride or nitrate with dilute sulphuric acid. Halides are hygroscopic and have the water of crystallization in their solid state (CaCl 2.6H 2 O). The nitrate salts tend to be soluble, but the carbonates and sulfates of the heavier alkaline earth metals are quite insoluble because of the higher lattice energy due to the doubly charged cation and anion. Reason The chlorides, bromides and iodides of all other elements i.e. The resulting solution upon concentration and cooling gives crystals of MgSO4.7H2O. Suspension of slaked lime in water is called white wash (milk of lime). CaCl2 is widely used for melting ice on roads, particularly in very cold countries because 30% eutectic mixture of CaCl2/ice freezes at 218 K as compared to NaCl /ice at 255K. Hence, the solubilities of sulphates of alkaline earth metals decrease down the group mainly due to the decreasing hydration energies from Be+2 to Ba+2. It’s an easier way as well. The hydroxides of Ca, Sr & Ba are obtained either by treating the metal with cold water or by reacting the corresponding oxides with water. The first I.E. : Higher the magnitude of lattice energy, lesser will be the solubility of the salt in the given solvent. On mixing with 1/3rd its weight of water, it forms a plastic mass which sets into a hard mass of interlocking crystals of gypsum within 5 to 15 minutes. are amphoteric while the oxides and hydroxides of other alkaline earth metals are basic. with nitrogen which is volatile while nitrides of others are non-volatile. Reactivity of the group 2 elements increases on moving down the group because their ionisation energy decreases. Physical properties of alkaline earth metals are:-, Like alkali metals, these are s-block elements, and have two electrons in the valence shell in s-orbital. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure. Limestone, marble, chalk or calcite, CaCO. The solubility of a salt in water depends upon two factors. Anhydrous MgCl2 is used in the electrolytic extraction of magnesium. All the hydrides react with water to evolve H. and thus behave as strong reducing agents. It is used as such as a fertilizer It is deliquescent and readily dissolves in water. The resultant of two effects i.e. Their solubilities decrease on moving down the group from Be to Ba. The carbonates decompose on heating form metal oxide and CO. When heated with nitrogen, it forms calcium cyanamide which on reaction with steam under pressure gives NH. Position yourself for success with a comprehensive curriculum and guidance from seasoned mentors. But it separates out from the reaction mixture as CaCl2×6H2O. This is because of increase in size which results in decrease of ionization energy which weakens the strength of M – O bonds in MOH and thus increases the basic strength. but the fluorides of other alkaline earth metals have high melting point and they are insoluble in water. However, Ca(OH)2 does not dissolve in dil. The reaction of these oxides with H2O is also sometimes called as slaking. 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