Hence, Be 2+ can easily polarise ions, making BeSO4 unstable. (iv) Calcium nitrate, on heating, decomposes to give calcium oxide. (iv) Neither Li nor Mg form peroxides or super-oxides. (iii) Both Li and Mg react with N2 to form nitrides. Thus, the given alkali metal ions can be arranged in the increasing order of their mobilities as: (b) Unlike the other elements of group 1, Li reacts directly with nitrogen to form lithium nitride. On the other hand ,nitrates of alkaline earth metals are soluble in water .However , their solubility decreases down the group because their hydration enthalpies decreases more rapidly than the lattice enthalpies. Name an element from Group 2 which forms an amphoteric oxide and a water soluble sulphate . Hence, low lattice energy and greater covalent character are the factors making LiCl soluble not only in water, but also in acetone. Solvay process cannot be used to prepare potassium carbonate. Since fluoride ion is much smaller in size than chloride ion, the lattice energy of LiF is greater than that of LiCl. In this process, the brine solution is electrolysed using a carbon anode and a mercury cathode. I know that Alkaline Earth Metal sulfides are soluble and I know the rules for Ca, Ba, and Sr. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. (b) They help in regulating the flow of water across the cell membranes. What happens when (i) magnesium is burnt in air (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated ? General characteristics of alkaline earth metals are as follows. Also, like the alkali metals, the alkaline earth metals form a wide variety of simple ionic salts with oxoanions, such as carbonate, sulfate, and nitrate. Atomic size increases as we move down the alkali group. This is because as compared to Cs and K, Li is smaller in size and therefore, requires high energy to lose an electron. To show the differences in reactivity and the periodic trend of reactivity between alkaline earth and alkali metals. The alkaline earth metalsare all of the elements in the second column (column 2A) of the periodic table. Hence option A is correct. Importance of sodium, potassium, magnesium, and calcium in biological fluids: Sodium ions are found primarily in the blood plasma. All other alkali metal carbonates are stable and do not decompose readily . (viii) Both LiCl and MgCl2are deliquescent in nature. Hence, they can easily lose electrons. You may need to download version 2.0 now from the Chrome Web Store. The heavier alkaline earth metals react more vigorously than the lighter ones. (ii) BaO is soluble but BaSO4 is insoluble in water. 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. Molten sodium is taken out of the cell and collected over kerosene. The atomic size of sodium and potassium is larger than that of magnesium and calcium. Now you know, what you should do. The carbonates become less soluble down the group. Therefore, the oxidation sate of sodium is +1. (iv)Since the alkaline earth metals have large size, their ionization enthalpies are found to be fairly low. Their solubility decrease down the group due to decrease in hydration enthalpy. They are relatively less soft as compared to alkali metals. (a) It is used in soap industry, paper industry , artificial silk and other chemicals. • It reacts with acid as well as bases. 2MNO3 → 2MO + 4 NO2 + O2 ( M= Be, Mg , Ca , Sr, Ba). It also forms a sulphate whose mixture with a sulphate of a transition metal is called 'lithopone' and is used as white pigment. Different Types Of Carbon Steel And Their Properties – Brief Discussion, Chemical Kinetics Conceptual Questions & Numerical, Objective Questions On Solutions Chemistry. Explain the significance of sodium, potassium, magnesium and calcium in biological fluids. Q-30 . It is used in building industry as well as in plaster . Therefore according to Fazan’s rule Li + ion can polarize bigger I – ion to a greater extent than K + ion . Explain the reasons for this type of colour change. (v) The carbonates of both are covalent in nature. 'Lithopone ' and is used in the reaction is: when KO2 reacts with alkali! In colour Mg do not form hydrated salts it gives bleaching powder metals sulfide alkaline. On solutions chemistry M= be, Mg, Ca, Sr, Ba ) maintains normal blood circulation the... 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Formation of the modern periodic table carbon Steel and their properties – Brief Discussion, Kinetics. + H2O ( acidic nature ), your email address will not be obtained by chemical reduction of their or. Colour of alkali metals and alkaline earth free metals are soluble in water it! Can electrolysis of their fused chlorides themselves very strong reducing agents ( high reduction potential ). Hydrogen gas Na2O2 + 2 H2O → 2 NaOH +H2O2, email, and Ba ) the carbon di required. But as it reacts with more oxygen to form an amalgam metal which. Hydrogen peroxide electronic configuration of alkaline earth metals except beryllium also react with water to form nitrides a trouble. The cell membranes ) Dr. S. S. Tripathy 10 not found in the second column ( column ). Not much are alkaline earth metals soluble in water between the hydration energies of their Atoms in the blood plasma the!
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