Which of the following is the least thermally stable? Therefore, these are soft and have low melting point. Lithium shows a diagonal relationship with, (a) sodium (b) silicon (c) nitrogen (d)magnesium, (a) an ammoniacal brine solution is carbonated with CO2, forming NaHCO3 which on decomposition at 150°C produces Na2CO3, (b) a sodium amalgum reacts with water to produce NaOH which gives Na2CO3 on reacting with CO2, (c) A brine solution is made to react with BaCO3 to produce Na2CO3. Why is the solution of alkali metals in liquid ammonia conducting in nature? Most hydroxides (OH -) are insoluble. Thermal stability of alkali metal hydrides and carbonates (1 answer) Closed last year. Halides Question 9. Question 27. Silver nitrite and potassium perchlorate are considered slightly soluble. Why are potassium and caesium, rather than lithium used in photoelectric cells? What is the mixture of CaC2 and N2 called? (i) Chile salt petre (ii) Marble (iii) Brine Answer: CaO is quick lime. (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. (a) Alkali metals show only +1 oxidation state. (i) CaC03 (ii) CaSO4 2H2O Solubilities of the halides, nitrates, carbonates, sulfates, and some perchlorates of all the alkali metals and alkaline earth metals in methanol at room temperature have been determined. (a) Lithium iodide is more covalent than lithium fluoride. 3. The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. (a) Nitrates (b) Carbonates (c) Sulphates (i) Limestone (ii) Cement (iii) Plaster of Paris. Answer: It is anhydrous calcium sulphate (CaSO4). 3. Why are alkali metals soft? In the vapour state, it exists as a chlorobridged dimer. (c) Since potassium is move reactive than sodium and it is found in nature to a less extent than Na, sodium is found to be more useful. Question 4. Thermal stability. Lithium shows a diagonal relationship with Thus Lil dissolves in ethanol more easily than the KI. Which one of the following alkali metals give hydrated salts? (b) a sodium amalgum reacts with water to produce NaOH which gives Na2CO3 on reacting with CO2 Silver acetate, mercurous acetate, and lead acetate are moderately soluble. Explain. Answer: (i) Caustic soda Na2CO3(s) + H2O(l)———–>2NaOH Answer: Question 3. Question 14. All nitrate (NO 3 ¯), nitrite (NO 2 ¯), chlorate (ClO 3 ¯) and perchlorate (ClO 4 ¯) salts are soluble. 2Na + O2 ——-> Na2O2. (c) It is because reduction potential depends upon sublimation energy, ionisation energy and hydration energy. For example, a typical Group 2 nitrate like magnesium nitrate decomposes like this: In Group 1, lithium nitrate behaves in the same way - producing lithium oxide, nitrogen dioxide and oxygen. The reducing property of alkali metals follows the order, (a) Na < K < Rb < Cs < Li (b) K < Na < Rb < Cs < Li, (c) Li < Cs < Rb < K < Na (d) Rb < Cs < K < Na < Li. Nitrates can be prepared by reacting the corresponding oxides, hydroxides and carbonates with nitric acid. Why is BeCl2 soluble in organic solvent? 2Cl– (melt) ——-> Cl2 (g) + 2e–. b) Alkali metal and nitrate salts are never soluble. (b) Lithium cannot be used in making photoelectric cells because out of all the alkali metals it has highest ionization energy and thus cannot emit electrons when exposed to light. Nitrates of alkaline and alkali metals give corresponding nitrites except for lithium nitrate, it gives lithium oxides. Question 32. This website has definitions for soluble, insoluble and slightly soluble plus a good set of rules for solubility at the end of the file. Nitrate and Alkali Metal rule 3. 2. (a) Li (b) Na (c) K (d) Cs Group 2 carbonates are insoluble in water because their Lattice energy are higher than hydration energy. Question 2. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to (a) ionic nature of lithium fluoride. Most nitrates tend to decompose on heating to the metal oxide, brown fumes of nitrogen dioxide, and oxygen. Answer: Alkali metals are highly reactive in nature. (a) a solution of Na2CO3 is alkaline? 2Cl-(aq) – 2e- ———> Cl2(g). How is it prepared? On moving down the group, their solubility decreases. Part 2. How would you prepare sodium silicate from silica? All nitrates are soluble, even if it’s a lead nitrate. As a rule of thumb, if it fits any of the following criteria, it is soluble: * Acronym: NAACP #1 are all soluble no matter what. The reducing property of alkali metals follows the order In the Solvay process No common ones. Since Ionization enthalpy of potassium is less than that of sodium, potassium is more reactive than sodium. Name the alkali metal which shows diagonal relationship with magnesium? Alkali metal salts are soluble and nitrate salts are not. MgO is basic and Mg (OH)2 is weakly basic and do not dissolve in NaOH solution. Nitrates and acetates are generally soluble. EXCEPT those of ammonium (NH 4+ ), … The most important slightly soluble substance is calcium hydroxide, Ca(OH)2. At anode: (a) Na < K < Rb < Cs < Li (b) K < Na < Rb < Cs < Li Sodium Nitrate. Answer: NaCl, CaCO3 and NH3. Thus, it has the highest charge density and hence attracts the water molecules more strongly. Question 7. All enzymes that utilise ATP in phosphate transfer require magnesium as a cofactor. No common ones. Answer: All the compounds are crystalline solids and their solubility in water is guided by both lattice enthalpy and hydration enthalpy. Heating the nitrates. Nitrate and Alkali Metal rule o 2. When it is added to water, Ca(OH)2 is formed. 1. However, there are other definitions of solubility since a third term called "slightly soluble" is one that some in chemistry prefer to use. Question 31. osti.gov journal article: solubility in ternary water-salt systems containing cerium nitrates and alkali metal nitrates Lithium nitrate on heating evolves O 2 and NO 2 and forms Li 2 O while other alkali metal nitrates on heating evolve and form their respective nitrites. Answer: Limestone: Question 22. In the final analysis, the table your teacher wants you to use is the most correct one for you to use. Basicity of oxides of alkali metals are higher than that of alkaline earth metals. Li+ ion has the highest polarising power. Na+ + e– —–> Na (l) Both react with nitrogen to form nitrides. Their solubility in water increases on moving down the group because their lattice enthalpies decrease more rapidly than the hydration enthalpies. (b) Lithium cannot be used in making photoelectric cells. Alkali metals are highly electropositive in nature. Question 11. They are less electropositive than alkali metals. Na (am) + e- (am) + NH3(l) ——–> NaNH2(am) + —1/2 H2(g). What happens when it is added to water? Write the chemical formula of the following compounds. Answer: It is because ionization enthalpy ∆Hi of potassium = 419 kJ mol -1. (a) 9. Ca(OH) 2 is slightly soluble. (a) Nitrates-Alkali and alkaline earth metal nitrates are soluble in water. Lead and Silver rule 1. Therefore, a large amount of energy is needed to excite their valence electron, and that’s why they do not impart colour to the flame. Answer: It is due to high lattice energy of LiF as compared to LiCl. Essentially, all alkali metal (Li +, Na +, K +, Rb +, Cs +) and ammonium (NH 4 +) salts are soluble. 3. (c) MgCl2 is electrolysed. 2. Answer: BaCl2 < SrCl2 < CaCl2 C2H5ONa + ½ H2. Whereas BeSO4 is ionic in nature and its hydration energy dominates the lattice energy. (iii) Lil is more soluble than KI in ethanol. Answer: (i) Ionization enthalpy. [ M = Be, Mg, Ca, Sr, Ba] (b) Carbonates- Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous? Nitrates are soluble in water. Compare the alkali metals and alkaline earth metals with respect to (i) ionization enthalpy, (ii) basicity of oxides, (iii) solubility of hydroxides. Answer: The low solubility of LiF in water is due to its very high lattice enthalpy (F– ion is very small in size). Nitrates. Answer: Size of Cs is the biggest thus, its melting point is the lowest, (d) is correct. Magnesium atom has small size so electrons are strongly bound to the nucleus. It is prepared by heating CaC2 with N2 at high temperature. LiF is soluble in non-polar solvents like kerosene. Nitrates of alkaline and alkali metals give corresponding nitrites except for lithium nitrate, it gives lithium oxides. Mg2+(aq) + 2e– ———-> Mg(s) Silver acetate, mercurous acetate, and lead acetate are moderately soluble. the alkali metals with those of alkaline earth metals (a) nitrates (b) carbonates (c) sulphates. Na+ + e– —–> Na NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 11 Entrepreneurship, NCERT Solutions Class 11 Indian Economic Development, NCERT Solutions Class 11 Computer Science. Most hydroxide (OH¯) salts are insoluble. Question 9. plays important roles in neuromuscular function. Answer: (a) Smaller the size of the ion, more highly it is hydrated and hence greater is the mass of the hydrated ion and thus the ionic mobility become lesser. The oxides of calcium, strontium, and barium are basic and the hydroxides are strongly basic. : Silver nitrite and potassium perchlorate are considered slightly soluble. Question 3. Name the alkaline earth metals whose salt do not impart colour to a non-luminous flame. When these electrons return to the ground state, the energy is emitted in the form of light. Alkali metal salts are soluble and nitrate salts are not. Alkali metal and nitrate salts are never soluble. The exceptions are the alkali metal hydroxides and Ba (OH) 2. 1. Question 5. Find out the oxidation state of sodium in Na2O2. Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone? (d) Li is the best reducing agent in aqueous solution. (c) more oxidizing (d) less basic than alkali metals (a) sodium (b) silicon (c) nitrogen (d)magnesium (iii) Quick lime Question 1. Which alkaline earth metals do not impart colour to the flame? Question 12. (a) The mobilities of the alkali metal ions in aqueous solution are Li+ < Na+ 2K0H + O2+ H2O2 Trump suggests he may not sign $900B stimulus bill. Solubility rules that apply to water solution: (1) All alkali metal (lithium, sodium, potassium, rubidium, and cesium) and ammonium compounds are soluble. 4. Question 17. Question 19. The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. 2Na- Hg + 2H20——>2NaOH +H2 +Hg From Li to Cs, thermal stability of carbonates increases. Which alkali metal cation has the highest polarising power? (a) MgCO3 (b) CaCO3 (c) SrCO3 (d)BeCO3 Potassium carbonate cannot be prepared by Solvay process. Most nitrates tend to decompose on heating to give the metal oxide, brown fumes of nitrogen dioxide, and oxygen. Nitrates can be prepared by reacting the corresponding oxides, hydroxides and carbonates with nitric acid. Carbonates of alkaline earth metals are insoluble in water. , SrCl2, BaCl2 answer: ( i ) Limestone ( ii ) CaSO4 2H2O answer: it added! 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