(a) Ca(C03)2           Q44. The correct order of solubility of alkali metal fluorides in water is

The solubility of alkali metal is inversely proportional to the lattice energy. All these metals have one valence electron. Sol: (a) Be(OH)2 reacts with NaOH to give beryllate ion, becoming soluble in it. (c) Tendency to form hydrate decreases from calcium to barium. Sol: (a) Sodium carbonate is synthesised by Solvay or ammonia soda process. Which of the following are the correct reasons for anomalous behaviour of lithium? Not all metal hydroxides behave the same way - that is precipitate as hydroxide solids. (iv) Ba – Insoluble sulphate (d) Ba (vi) Ba – Apple green. 2LiOH + Δ → Li 2 O + H2O. Q29. (d) All of the above. Sol: (i → f); (ii →d); (iii → b); (iv → c); (v →e); (vi → a), Elements with the characteristic flame colour are as follows ‘ (iii) Enthalpy of hydration (a) Act as dehydrating agents. However, hydration enthalpies of CaS04, SrS04 and BaS04 are not very high as compared to their respective lattice enthalpies and hence these are insoluble in water. Be atom is tetrahedrally surrounded by four Cl atoms - two are bonded by covalent bonds while the other two by coordinate bonds.  is due to its electron deficient nature. Metal Oxide Basicity Group II metal oxides become more basic as you go down the column. The hydrates are MgCl. (v) Sr – Crimson red (b) BaCl2 .4H20 Formation of Salts with Acids. (a) Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal. 2NaOH + H 2 SO 4 → Na 2 SO 4 + 2H 2 O (c) CaCl2 . (a) Tendency to form ionic/covalent compounds [Calcium oxalate is insoluble in water.] oxide soluble in aqueous NaOH is : 2.6k LIKES. BeO, however, is covalent and insoluble in water. Sol: (b) Raw materials for cement are limestone, clay and gypsum. (c) CaCl2                 Among the following metal halides, the one which is soluble in ethanol is NaOH + HCI → NaCI + H 2 O . Which of the following alkali metals is expected to melt if the room temperature rises to 30°C? Ltd. Download books and chapters from book store. No chemical reaction occurs. © Q10. (c) colour of cement becomes light. Q23. More the lattice energy, lesser will … Q41.Match the elements given in Column I with the properties mentioned in Column II. Beryllium chloride has different structures in solid and vapour state. Thus, Cs has the lowest melting point (28.5°C) and will melt at 30°C. Metal hydroxides such as \(\ce{Fe(OH)3}\) and \(\ce{Al(OH)3}\) react with acids and bases, and they are called amphoteric hydroxide.In reality, \(\ce{Al(OH)3}\) should be formulated as \(\ce{Al(H2O)3(OH)3}\), and this neutral substance has a very low solubility. . (d) Thermal stability of oxosalts, The basic character of the ox­ides increases down the group. Alkali metals hydroxides being strongly basic react with all acids forming salts. All halides are soluble in water. All alkaline earth metals (except Be and Mg) impart a characteristic colour to the Bunsen flame. Be > Mg > Ca > Sr > Ba. (d) low ionization enthalpy of lithium atom. All these carbonates decompose on heating to give C02 and metal oxide. Properties of Sulphates of Alkali Earth Metals. (ii) Nature of halides – Alkali metal halides have general formula MX. The basic character of oxides in­creases from MgO to BaO. (a) High boiling point. Sol: (b) 2Ca(N03)2→2CaO + 4N02 + 02 Which of the following alkali metals reacts with water least vigorously? (b) Both A and R are true but R is not the correct explanation of A. (c) High density. (b) Mg(OH)2 Q12.When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. Q13. (a) ionic nature of lithium fluoride. (b)CaC03 (d) BaCO3 I originally thought no other hydroxides are soluble, and many sources also say this. Describe two important uses of the following;(a) Caustic soda (b) Sodium carbonate   (iii) Quick lime. Sol: (i → c); (ii →d); (iii → b); (iv→a) (ii) The solubility and the nature of oxides, of Group 2 elements. (ii) The solubility of oxides of Mg, – Ca, Sr and Ba increases from Mg to Ba. (iii) All alkali metals form oxo salts such as carbonates, sul­phates and nitrates. Q8. (iii) sodium peroxide dissolves in water? M (OH) 2 + H 2 SO 4 → MSO 4 + 2H 2 O MCO 3 + H 2 SO 4 → MSO 4 + CO 2 + H 2 O . This discussion on What is the solubility order of fluorides for alkaline earth metals? Further, due to small size, the hydration enthalpy of Be2+ ions is much higher than the lattice enthalpy of BeS04. Q7. The oxides are basic and basic nature increases from BeO to BaO (due to increasing ionic nature). (c) Ca(OH)2 Q15. Compare the alkali metals and alkaline earth metals with respect to (a) ionisation enthalpy, (b) basicity of oxides and (c ) solubility of hydroxides. Sol: (a) Due to high ionization enthalpy and small size, Be does not react with hydrogen by direct heating. Single Correct Answer Type Hence, the order is: Q9. (c) Ca2+ ions                                            Be does not exhibit coordination number more than four and BeO is amphoteric in nature. We all know that the hydroxides of Li, Na, K, Rb, Cs, Mg (little, but is a strong base), Ca (a little), Sr and Ba are soluble. (a) CaCl2 ‘ Name an element’ from Group 2 which forms an amphoteric oxide and awater soluble sulphate. Explain. Q4. (i) Thermal stability of carbonates of Group 2 elements. Discuss the various reactions which occur in the Solvay ammonia process. Li resembles Mg due to similar atomic radii and ionic radii. Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide: 6H 2 O), are soluble in water and therefore are easily extracted and purified. 56Ba = Is2,2s2,2p,3s2, 3p6, 3d10,4s2,4p6,4d10, 5s2, 5p6,6s2. (d) Ba(OH)2 (a) Na (b) K (c) Rb (d) Cs (a) BeCO3 (a) Be                      (b) Mg                      Q32. (a) setting time of cement becomes less. Q16. (d)A is hot correct but R is correct. The oxides of the alkaline earth metals (except BeO and MgO) dissolve in water to form basic hydroxides and evolve a large amount of heat. NCERT Exemplar ProblemsMathsPhysicsChemistryBiology. Q34. (d)A is not correct but R is correct. A chemical A is used for the preparation of washing soda to recover ammonia. Which of the following compounds are used for textile industry? (d) ammoniated sodium ion (i) CaC03 – Manufacture of high quality paper Sol: Because of the small size, high electronegativity and high ionization enthalpy, lithium compounds have considerable covalent character while compounds of other alkali metals are ionic in nature. (b) sodium ion Matching Column Type Questions (iv) CaS04 – Dentistry, ornamental work. Sol: (d) Chlorides of alkaline earth metals are hydrated salts. (ii) Since larger cations stabilize larger anions due to higher lattice energies, therefore, the stability increases from oxide → peroxide→superoxide as the size of the metal cation increases down the group and the size of the anion increases from oxide → peroxide → superoxide. (c) Beryllium exhibits coordination number more than four. In the light of these features, describe the nature of their oxides, halides and oxosalts. Thus, BeS04 and.MgS04 are soluble. The s-block elements are characterized by their larger atomic sizes, lower ionization enthalpies, invariable +1 oxidation state and solubilities of their oxosalts. (b)     Calcium nitrate Q26. (b) quick lime The thermal stability; of these carbonates increases down the group, i.e., from Be to Ba, (ii) Ca(OH)2 – Used in white washing Entropy change plays a big part too here. Sol: No. On heating plaster of Paris at 200°C, it forms anhydrous calcium sulphate, i.e., dead plaster which has no setting property as it absorbs water very slowly. Discuss the trend of the following: 4 ] 2, Q11 Mg due to disinfectant nature due to small size of the following statements is about... Electronic excitation and de-excitation ) requires energy cement are limestone, clay gypsum! Hygroscopic nature, lattice enthalpy and hydration enthalpy of the Tendency of an element ’ Group... Hydration of calcium aluminates and silicates how do you account for the strong reducing power of a the... Exhibits coordination number more than four and BeO is amphoteric in nature their. Soda ( b ) CaO ( c ) Both a and R are true and R true! Of BeS04 and MgS04 are highly soluble in water. oxo salts such as carbonates, sulphates and nitrates purely. 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