Answer:(i) NaNO3 (ii) CaCO3 (iii) NaCl. They are thermally stable. Therefore, Lattice energy of Na2CO3 is higher than that of Li2CO3. Answer:  Be and Mg. All enzymes that utilise ATP in phosphate transfer require magnesium as a cofactor. That is why these metals are not obtained by chemical reduction methods. Question 14. Question 4. Potassium carbonate cannot be prepared by Solvay process. Answer: This is due to the reason that potassium bicarbonate (KHCO3) formed as an intermediate (when CO2 gas is passed through ammoniated solution of potassium chloride) is highly soluble in water and cannot be separated by filtration. Find out the oxidation state of sodium in Na2O2. Below is a metal hydroxide solubility curve showing the solubility of the common heavy metal ions and their respective solubility versus pH. What is dead burnt plaster? Answer: Benzene can be used to store an alkali metal because other substances react with alkali metal as: Alkaline earth metals are Write the chemical formula of the following compounds. Question 11. Question 6. 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. (ii) Sodium hydroxide is manufactured by electrolysis of an aqueous solution of NaCl (brine) in Castner-Kellner cell. Alkali metals are highly reactive in nature. Draw the structure of (i) BeCl2 (vapour), (ii) BeCl2 (solid). (c) Na2O and CO2 Name the alkali metal which shows diagonal relationship with magnesium? (ii) Sodium metal is heated in free supply of air? Why are alkali metals soft and have low melting points? Group II metal hydroxides become more soluble in water as you go down the column. (iii) Quick lime Electropositive character increases on going down the group. (b) Due to its smaller size lithium can form nitride directly. Solubility of hydroxides: The hydroxides of alkaline earth metals are less soluble than those of alkali metals. What is Quick lime? Na2CO3(s) + H2O(l)———–>2NaOH (c) A brine solution is made to react with BaCO3 to produce Na2CO3 Na (am) + e- (am) + NH3(l) ——–> NaNH2(am) + —1/2 H2(g). drying agent for removing water from the atmosphere—CaCl, Group 2 elements almost exclusively form ionic compounds containing the M. How many liters of chlorine gas will be released at standard temperature and pressure? Which of the following is not a peroxide? The elements in Group 2 are called the alkaline earth metals. (b) Lithium cannot be used in making photoelectric cells. Answer. Answer: Alkali metals and alkaline earth metals are most electropositive due to low ionization ethalpy therefore they form ionic hydrides, e.g. (c) 4. Answer: (a) According to Fazan’s rule, Li+ ion can polarise  l– ion more than the F– ion due to bigger size of the anion. Explain the following: What happens when crystals of washing soda are exposed to air? (c) Na2O+ CO2 ———–>Na2CO3. Answer: Alkali metals dissolve in liquid ammonia and give deep blue solutions which are conducting in nature because ammoniated electrons absorb energy in the visible region of light and impart blue colour. Answer: Question 3. Only strontium hydroxide (Sr (OH) 2) and barium hydroxides (Ba (OH) 2) are completely soluble from alkaline earth metals. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.. (d) 3. Answer:  (i) Caustic soda (d) all of the above Thermal stability of carbonates of group 2 increases down the group because Lattice energy goes no increasing due to increase in ionic character. 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