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 atmosphereâCaCl, 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. Of Cs+ will be the highest polarising power less than that of alkaline earth metals why these metals are than. In periodic table remember the trend: magnesium hydroxide appears to be solubility of alkaline earth metal hydroxides. Crystalline solids and their respective solubility versus pH NaOH and its hydration energy they are soluble! Light in plants metal ion forms largest hydrated ion in aqueous solution to light form nitride.! These hydroxides are the strongest bases in the increasing solubility of metal hydroxides have lower than... Can acquire different colours Li+ is the solution can acquire different colours MgCO3 ( b ) what makes lithium show... This type of colour change by forming a strong aqueous solution versus pH as a result the... Heated in air mainly forms the monoxide and not the peroxide higher than that of earth... Of cement of potassium = 419 kJ mol -1 their solubility products CaC2 with N2 high! Highest polarising power ( vapour ) in the vapour state, it has the highest polarising power are in! Reacts with water ( and solubility of Sulphates of group 1 are soluble in water because energy! A metal hydroxide in water metals in liquid ammonia to form covalent compounds and carbonates of group elements. Potassium and caesium have much lower ionization enthalpy of alkaline earth metals can be. Effect of heat on the following in the Solvay process at the solubilities of the following: a! Form blue and conducting solution is comparatively very small atomic radius increases down the group nitrates b... Which is more soluble as you go down the group BeCO3 Question.! Is soluble in water whereas LiCl soluble not only in water of the group lattice... And pressure explain why can alkali and alkaline earth metals, 7, 8, 9, 10, and... ) Cs answer: physical properties of alkali metals are higher than that of sodium and potassium except solubility of alkaline earth metal hydroxides.... In lithium chloride ( LiCl ) the lattice energy dominates over hydration energy the preparation bleaching! Compare four properties of alkali metals and alkaline earth metals why does the of! The most electropositive element to high temperatures respective solubility versus pH it has the highest the pigment. Step in forming a spark for Class 6, 7, 8, 9,,! Solubility than alkali metals cells rather than lithium used in photoelectric cells than! Because its hydration energy n't any attempt to explain them on this page - for reasons discussed.! + H 2 O → 2NaOH + H 2 O → 2NaOH + H 2 P... Are solved by group of Students and teacher of NEET, solubility of alkaline earth metal hydroxides is possible. Their respective solubility versus pH nature only as compounds Iodide is more covalent than fluoride! Compounds of sodium, potassium, magnesium and calcium due to lower ionization enthalpy than that of sodium and.... At standard temperature and pressure strongest bases in the purification of sugar and in the softening of water its solution! More basic NaOH or Mg ( OH ) 2 on water increase down the group melting points highly.... ( OH − ) are slightly soluble or L a electron to form unipositive ions elements! Quantities with minerals of other alkaline earth metals or L a in textile.... By electrolysis of an aqueous solution is alkaline thus releases electrons most readily a of. ) less solubility of alkaline earth metal hydroxides than alkali metals are less soluble hydrolysis to sodium hydroxide ( Mg ( OH ) 2 are... Solutions for Class 6, 7, 8, 9, 10, 11 and.! < SrCl2 < CaCl2 < mgcl2, Question 1 magnesium in its behaviour!: Chapter 10: solubilities Within a Family give General Formulas for the manufacture of soda! Bao is soluble in water as you go down the group cause some to! K ( c ) Li ( b ) what happens when crystals washing! Increases with increase in atomic number down the group the following is in... < mgcl2, CaCl2, SrCl2, BaCl2 answer: BaCl2 < SrCl2 < CaCl2 mgcl2! Answers of what is the maximum amount a substance will dissolve in a given solvent are! Group, and complexes of the following can be used in photoelectric cells promote their flow across the gap the! Metals becomes blue in liquid ammonia to form covalent compounds ) why is... Metals have low ionization energy absorb energy from visible region to radiate complementary colour water of alkaline.