What happens when Write the chemical formula of the following compounds. Which alkali metal ion forms largest hydrated ion in aqueous solution? Explain the following: Answer:  It is called Nitrolime. Silver acetate, mercurous acetate, and lead acetate are moderately soluble. Question 4. The solubility results were obtained in water or aqueous solutions. Alkaline earth metal carbonates and sulphates have lower solubility than alkali metal carbonates and sulphates. Answer: (a) Na2CO3 is a salt of a weak acid, carbonic acid (H2CO3) and a strong base NaOH. That’s why they always exist in combined state in nature. Halogen rule 3. Answer: Alkali and alkaline earth metals are themselves better recucing agents, and reducing agents better than alkali metals are not available. Don't worry! Answer: Since the atoms of alkali metals have bigger kernels and smaller number of valence electrons, the metallic bonds in them are very weak and hence are soft. From Li to Cs, due to larger ion size, hydration enthalpy decreases. 2Cl-(aq) – 2e- ———> Cl2(g). (c) 10. Most nitrates tend to decompose on heating to the metal oxide, brown fumes of nitrogen dioxide, and oxygen. Q9. Which of the following is used in photoelectric cells? Cl + Cl——–>Cl2 No common ones. ‘ … Alkali metals due to lower ionization enthalpy are more electropositive than the corresponding group 2 elements. Answer: The low solubility of LiF in water is due to its very high lattice enthalpy (F–  ion is very small in size). Answer:  Li. Answer: It is because ionization enthalpy ∆Hi of potassium = 419 kJ mol -1. (a) It is used in the manufacturing of soap paper, artificial silk etc. MgO is basic and Mg (OH)2 is weakly basic and do not dissolve in NaOH solution. The reducing property of alkali metals follows the order (3) Silver, lead, and mercury(I) compounds are insoluble. (a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3 Essentially, all alkali metal (Li +, Na +, K +, Rb +, Cs +) and ammonium (NH 4 +) salts are soluble. Which alkali metal cation has the highest polarising power? Mg is the main pigment for the absorption of light in plants. Question 11. Alkali metal salts are soluble and nitrate salts are not. How would you prepare sodium silicate from silica? Answer: (a) Na2O2 + 2H2O ——-> 2Na0H + H2O2 Why is Li2CO3 decomposed at a lower temperature whereas Na2CO3 at higher temperature? (d)Since, among alkali metals, lithium has the most negative electrode potential (E° = -3.04 V) so, it is the strongest reducing agent in the aqueous solution. Na + H2O —–> NaOH + 1/2H2 SOLUBILITY RULES A SUMMARY OF SOLUBILITIES RULE EXCEPTIONS 1. (c)Due to the small size of Li+ it has a strong positive field which attracts the negative charge so strongly that it does not permit the oxide ion, 02- to combine with another oxygen atom to form peroxide ion. Solubility rules that apply to water solution: (1) All alkali metal (lithium, sodium, potassium, rubidium, and cesium) and ammonium compounds are soluble. What is dead burnt plaster? Answer:  Be and Mg. The oxides of calcium, strontium, and barium are basic and the hydroxides are strongly basic. ALkali metals are distinguished by having a single electron in its outermost (most reactive) ground state. Question 17. Answer: Li2CO3 is a covalent compound whereas Na2CO3 is an ionic compound. (b) Smaller the size (internuclear distance), more is the value of Lattice enthalpy since internuclear distance is expected to be least in the LiF. What are the common physical and chemical features of alkali metals? Answer: BaCl2 < SrCl2 < CaCl2 M(s) (where M = Ca, Sr, or Ba) is nearly constant. Question 6. Question 1. It is prepared by heating CaC2 with N2 at high temperature. JKBOSE Class 12th Chemistry Official Guess/Model Paper 2020-21, NCERT Solutions for Class 11 History Chapter 11 Paths to Modernization, NCERT Solutions for Class 11 History Chapter 10 Displacing Indigenous Peoples, NCERT Solutions for Class 11 History Chapter 9 The Industrial Revolution, JKSSB Panchayat Accounts Assistant Result Declared – Check here, JKBOSE Class 12th Biology Official Guess/Model Paper 2020-21, JKBOSE Class 11th English Official Guess/Model Paper 2020-21, General Characteristics of the Compounds of the Alkali Metals, Biological Importance of Sodium and Potassium, General Characteristics of Compounds of the Alkaline Earth Metals, Biological Importance of Magnesium and Calcium. Berrylium hydroxide ( Be(OH) 2) and magnesium hydroxide ( Mg(OH) 2) are completely insoluble in water. (i) Chile salt petre (ii) Marble (iii) Brine (b) Na and K impart colour to the flame but Mg does not. (c) MgCl2 is electrolysed. (b) KO2 and water Question 30. 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