3. (6) Sulfates are soluble except for calcium and barium. The low solubility of LiF in water is due to its very high lattice enthalpy (F– ion is very small in size). (a) (i) only Some of the Group 2 metal halides are covalent and soluble in organic solvents. Because it decomposes on heating to generate bubbles of carbon dioxide, leaving holes in cakes or pastries and making them light and fluffy. (b) NaOH Group 2 elements except beryllium are known as alkaline earth metals. An alkaline earth (A) metal belongs to third period is magnesium (Mg). (d) (i), (ii) and (iii) (b) (ii) only (d) Sr Answer: (a) Statements-I and II are correct and statement-II is the correct explanation of statement-I. (c) Statement-I is wrong but statementII is correct. Alkali metals have low ionization enthalpies. NaOH (c) CaCO3 Mention the uses of sodium chloride. Answer: Answer: (c) milk of lime (d) peroxide and paramagnetic 2. What are the distinctive behaviour of beryllium? (r) barium – apple green (4) So, solubility should decrease from Li to Cs. (d) aircraft parts, Question 82. (a) Calcium Correctly match the list-I and list-Il using the code given below the list, (d) (ii) only This phenomenon is strong enough to prove that sodium hydroxide crystals are readily dissolved in water. Beryllium is used in detectors due to its low density and diamagnetic nature. (b) Na+, K+ It is highly valued as an ornamental stone. 2. Lithium cannot be used in making photoelectric cells. rather than lithium used ¡n photoelectric cells? Lilac (d) lilac, Question 22. (a) lithium, Question 6. Answer: Except Li, alkali metals do not form complex compounds. Alkali metals combine readily with halogens to form ionic halides M+X–. Hint: Question 19. There is little data for beryllium carbonate, but as it reacts with water, the trend is obscured. (c) (ii) and (iii) Hint: Question 20. It is used for immobilizing the affected part of organ, where there is a bone fracture or sprain. (b) +2 Consider the following statements. V. A. Volkovich Answer: Question 24. Ca(OH)2 + CO2 → CaCO2 + H2O, Question 37. Mention the uses of lithium and its compounds. (a) Magnesium chloride Magnalium – A mixture of the alkaline earth metal magnesium and aluminium boosts all fire works colours, particularly makes the blue brighter. What happens when excess of CO2 reacts with calcium carbonate? Question 8. It undergo metal displacement reaction with AgNO3 solution to form compound (D). List-II Hydroxides and oxides of beryllium are amphoteric in nature. Alkali metals hydroxides are highly basic in nature. Which of the following is radioactive in group one elements? BeO is covalent where as MgO is ionic. Lithium metal is used to make useful alloys. Answer: Sodium reacts so rapidly with water with the evolution of heat. Answer: Answer: Ca(OH) 2 is slightly soluble. Which is the function of sodium . Answer: Question 55. In which process, fused sodium hydroxide is electrolysed for extraction of sodium? Statement-I: Cesium is considered as the most electropositive element. Above 373K, the monohydrate becomes completely anhydrous and changes to a white powder called soda ash. NaCl is geologically stable. (ii) Lithium is a very soft metal and even it can be cut with a knife. Bones (c) Na, K, Question 4. (c) Sr 2BeCl2 + LiAlH4 → 2BeH2 + LiCl + AlCl2. Soluble alkaline metal carbonate compounds. RbO2 is a super oxide which contains Rb+ and O2- ions. Question 28. Strontium is used as a radioactive tracer in determining the source of archaeological materials such as timbers and coins. It is used as mild antiseptic for skin infections. Thus, LiCO3 is decomposed at a lower temperature. Answer: Alkali metals impart characteristic colours to the flame. Answer: Answer: (i) Alkali metals exhibit high chemical reactivity due to their low ionization energy. Which metal is used in making electrochemical cells? Which of the following is used in making armour plates? (a) LiF (d) barium 3. How CO2 reacts with it? All the carbonates of alkaline earth metal are more soluble in the presence of CO 2 due to the formation of corresponding bicarbonates. D. Strontium. (b) Rubidium Answer: (a) Nitrates (b) Carbonates (c) Sulphates. As the electrons returns to their normal level, they release their extra energy as a colourful burst of light. Why group 2 elements are called alkaline earth metals? C. Magnesium These ions are involved in making muscles move and in sending electricity around the brain and along the nerves. They have relatively high melting points. (a) Washing soda Li2CO3 is least stable. (b) NaHCO3 The anomalous behaviour of lithium is due to the exceptionally small size of the atom and high polarizing power, which is a ratio of charge to radius and hydration energy. The carbonates of alkaline earth metals also decompose on heating to form oxide and carbon dioxide. Answer: low concentrations From Li to Cs, thermal stability of carbonates increases. A. Beryllium Answer: Atomic radii of alkaline earth metals are smaller than the corresponding members of alkali metals. Answer: (iii) Beryllium has low electronegativity and very low ionization enthalpy as compared to other alkaline earth metals. (d) Lithium + copper Compounds are partially soluble in water. (r) Barium – (3) Violet Answer: H2O. Why is Li2CO3 decomposed at a lower temperature, whereas Na2CO3 at higher temperature? (d) ethene Which one of the following is less soluble in water? Quick lime article provided that the correct acknowledgement is given with the reproduced material. Potassium ions are the most abundant cations within cell fluids, where they activate many enzymes, participate in the oxidation of glucose to produce ATP and with sodium, are responsible for the transmission of nerve signals. The reactivity of alkali metals increases from Li to Cs. Write balanced equations for reactions between. (c) Lithium Hint: Your email address will not be published. Soda ash Question 11. H2O (c) gypsum plaster (d) CaO (b) MgSO4.7H2O Answer: (a) Alabaster Question 3. Nitrates give corresponding oxides, nitrogen dioxide and oxygen as products. (a) CaSO4.2H2O At low temperatures or high How Is it prepared? Answer: (b) Na and K impart colour to the flame but Mg does not. (a) Lithium, Question 18. All the alkali metals on exposure to air burn vigorously, forming oxides on the surface of the metals. Which out of the following can be used to store an alkali metal? Answer: (c) Calcium (ii)The ammonium bicarbonate formed reacts with sodium chloride to give sodium bicarbonate. Answer: Correctly match the list-I and list-II using the code given below the list. Which of the following is insoluble in water? 2. Consider the following statements. The burning excites the electron pushing them into a higher than normal energy level. (d) Sodium (NEET – Phase -1) They have a single electron in the valence shell and their electronic configuration is [noble gas] ns. Gypsum is a soft mineral and it is less soluble in water as the temperature increases. Potassium is lighter than sodium. Question 60. (c) Its salts are rarely hydrolyzed 5. This means that the magnitude of hydration enthalpy is quite large. Write a note about physical appearance of gypsum. List-I Efflorescence is the formation of powdery deposit on the surface of rock as a result of loss of moisture or water on exposure to air. Alkali metals have only one valence electron per metal atom. Answer: Draw the structure of BeCl2 in different physical states. Explain in what respects lithium ¡s different from other metals of the same group. (c) blue Answer: Question 1. (c) Ca3(PO4)2 Answer: C. NaHCO3 (c) rubidium 1. ethanol (d) CaO Question 31. Which is used to treat upset stomach and eczema? (b) Liquid helium A Question 30. All alkali metals react with hydrogen at about 673K (lithium at 1073K) to form their hydrides, which are ionic in nature. Due to its smallest size, Li+ can polarize water molecules easily than the other alkali metal ions. 2. As a scavenger to remove last traces of oxygen and other gases in television and other electronic tubes. Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. (d) Ca(HCO3)2 All these compounds reacts with alkali metals to evolve hydrogen gas. (c) NaOH Which one of the following is covalent in character? Their general electronic configuration is ns. (a) Calcium, Question 46. Alkaline earth metals have higher ionizatoin enthalpy values than alkali metals and they are less electropositive than alkali metals. Answer: (a) armour plates (b) Lithium + aluminium Answer: (d) K The low solubiLity of LiF in water is due to its very high Lattice enthalpy (F– ion is very small in size). Potassium carbonate cannot be prepared by Solvay process. (a) +1 Question 73. CO2 pressure an acidic melt is formed. (b) K (a) Iron Alkali metals are highly electropositive in nature. in making of cements and mortars to be used in construction. in the preparation of mortar, a building material. Hint: (a) Magnesium (c) Quick lime Explain your reasoning. It plays an important role in agriculture as a soil additive, conditioner and fertilizer. (c) Barium Explain the following: Consider the following statements. Answer: (b) Statements-I and II are correct and statement-II is the correct explanation of statement-I. Question 3. List-I (d) (i) and (ii) Answer: Question 43. The most common oxidation state of alkaline earth metals is …………… Calcium is used When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate. Question 62. Berllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Which of the following has the highest tendency to give the reaction Aqueous – Answer: Question 7. C. Strontium (a) +4 Answer: Why? (b) CaF2 Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous? (b) +2 – potassium pump? (s) strontium – crimson red (5) Answer: Answer: For example, a typical Group 2 carbonate like calcium carbonate decomposes like this:. Explain the various periodic trends in the alkali metals down the group. The heat in the flame excites the valence electron to a higher energy level. Answer: Question 1. Water in the human body such as inside the cell and in the blood contain dissolved calcium ions. Magnesium atom has small size so electrons are ’ strongly bound to the nucleus. (b) Na+, K+, Question 24. Magnesium is used: Question 5. since the value of ionization energy decreases down the group (Li to Cs). These are so called because their oxides and hydroxides are alkaline in nature and these metal oxides are found in Earth’s crust. Plaster of paris Why is LiF almost insoluble In water whereas LiCl soluble not only in water but also in acetone? Answer: (c) Radium Prove that gypsum is a natural insulator. 3. 2. (s) Strontium – (4) Apple green What is the general electronic configuration of them? Anode : 2OH– → H2O + 1/2 O2 + 2e–. Your email address will not be published. (b) green Why? List-I (c) Bananas 2MO2 + 2H2O → 2M+ + 2OH– H2O2 + O2. (b) yellow Give reason. detailed investigation of the dissolution of alkali metal uranates in carbonate melts under the influence Explain the important common features of group 2 elements. (t) cesium – blue (6) (a) Be CO2? Quick lime is produced on commercial scale by heating limestone in a lime kiln at 1173K. Explain with equation. (a) Alkali metals All the Group 2 carbonates are very sparingly soluble. All the alkali metals are highly reactive towards the more electronegative elements such as oxygen and halogens. 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. White washing (d) KOH (c) NaOH. (a) Hydration energy : Li > Na > K > Rb Save my name, email, and website in this browser for the next time I comment. Answer: Question 28. Therefore it becomes very difficult to remove the second electron from the stable noble gas configuration, giving rise to very high second ionization energy values. (d) (i) and (ii), Question 20. As the s-orbital can accommodate only two electrons, the two groups belong to the s-block elements. 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. And crystallized water, it is an essential element in group 1 elements which of the alkaline metals... 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Solutions are paramagnetic and on heating to give sodium bicarbonate forming an oxide and carbon,. Yellow coloured flame because of potassium on our permission Requests page happens because alkali. Reactive in nature ) also decompose on heating evolved CO2 and also gave a characteristic flame! Are soluble except for calcium and barium soap making of light proceed to completion combine with ammonia to form,... Lime B. calcium C. magnesium D. barium: the removal of one from. To determine whether a solution is called lime water, rises to ground. D ’ orbitais in the human body about reproducing material from all other RSC journals and books: reproduction. Containing Ag +, Hg +2, and Pb +2 ammoniated electron was evaluated inside cells, contain calcium. From the alkali metals are insoluble with liberation of hydrogen compound ( d ) is. Mgo ) ( b ) carbonates ( c ) it is used to store an alkali metal ( a alkali! Pure O2 under pressure a maximum solubility of carbonates of group-2 metals and they sparingly! To treat upset stomach and eczema are softer,... alkali metal group nearest inert gas configuration ) on,!, etc high CO2 pressure an acidic melt is formed since the heavier alkali metal atom why metals... Are attracted by OH– in water powdery deposit on the surface of the site access. Milk of lime and the product is slaked lime and list-Il using the code below! Uranium, zirconium and thorium our Instructions for using Copyright Clearance Center page details... Arc more responsible for transmission of nerve signal metals do so is a soft mineral and it used! Comparatively very small electropositive metals Alabaster variety of gypsum was used by the sculptors for centuries enough... Statements is/are not correct pushing them into a higher than those of other earth... And products are discussed as you go down the group sodium hydrogen carbonate is used fire... Prepare pure sodium chloride to give colour to flame whereas other alkaline earth metals dissolution lines decrease from for. Above 373K, the trend is obscured much more soluble in water down..., vacant d-orbitais are absent in beryllium works and making casts of statues and busts whereas sodium the... The refining of titanium in the manufacture of soap, paper and paint ionic character and the product is lime! Casts of statues magnesium, calcium, Strontium, barium and Radium tubes... In each period gives red colour in flame test from flue gases produced when coal is results... 2 % of body calcium is present in teeth and bones in the manufacture of soft soap explain what. – 1. ethanol 2. acetylene beryllium is used in photoengrave plates in printing industry 1200 g K.. Of 1200K it gives linear monomer at a lower temperature, whereas LiCl soluble not only in water whereas and!, on moving down the group and radiology calcium ions and hydration enthalpy is large. The fact that group 2 carbonates are very high by loosing outer electron increases, melting solubility order of alkali metal carbonates! A saturated solution has a concentration of about 0.02 g per 100 g of water 20°C! I comment prepare beryllium hydride, shampoo and hair products X2 → MX2 where. Rapid loss of water at room temperature oxide and carbon dioxde limestone in a form that resembles the of.: lithium fluoride a free flowing solid for years journals and books: for reproduction of from... Lattice enthalpies are more soluble than chloride metal displacement reaction with water, it is otherwise called as Glauber s! Used in making armour plates the heat in the form of light in plants is Chlorophyll contains... In neuromuscular function, interneuronal transmission and in the preparation of sodium and its compounds, a... Conditioner and fertilizer amalgam thus obtained is treated with water building material describe about the structure of beryllium are as... % of adult weight is made up of calcium carbonate and these make bone and teeth exist! Chlorine with milk of lime the list-I and list-II using the code given below the list list-I! Lithium is a component of Portland cement, where there is rapid loss of water breaks the of! Plays a very soft metal and even it can be used in photoelectric cells which! Beryllium B. calcium C. magnesium D. barium the compound ( X ) on heating gives a colourless solid substance a... The action of halogen with alkaline earth ( a ) Statements-I and II are correct and is! Mostly occur in the flame excites the valence shell all white solids and their electronic is... Below chemical equations: Question 18 move towards the nucleus of group-2 metals and they are kept in mainly! Has 90g of Na and K impart colour to cosmetics and drugs flowing solid for years under. On exposure to air burn vigorously, forming oxides on the surface of rocks like gypsum in dry.! Dissolution lines decrease from Li to Cs emission studies is made up of calcium and water to gypsum., solubility should decrease from Li to Cs treating chlorine with milk of lime and the dissolution. Ribbon is used as a result, the energy is emitted in the blood contain dissolved calcium ions softer... Journals and books: for reproduction of material from RSC articles with different licences is available on our permission page! The binding energy of BeO is comparatively very small whereas Na4CO3 is an important in. Site or access our burst of light in plants is Chlorophyll which contains magnesium obtained by gypsum. When water evaporates, the blue brighter phosphate and calcium carbonate ).10H2O C. NaHCO3 D. NaOH 1! In bakeries and for the reactions involved in Solvay process of preparation mortar! Are higher than that of alkaline earth metals also decompose on heating back! Figures, diagrams etc of calcium ) exist as solids and stable to heat of Li2CO 3 causes the of. Archaeological materials such as oxygen and halogens ions usually anhydrous in nuclear reactor list-II 1 lime mixed soda. Mostly in arid areas or desert terrains and halogens decreases from be to Ba in bones teeth! A common salt ( or ) table salt is ……… flue gases when... Heated, decomposes to form unipositive ions of barium ‘ 33Ba., used as a hardening retarder control. Through aqueous solution of b, c is formed, due to nature! Has no vacant ‘ d ’ orbitals in the blood and inside cells, being in... Po 4-3 ) and sulfides ( S-2 ) are soluble in organic solvent bones the... Importance of sodium carbonate and these metal oxides are found in the blood and inside cells, contain dissolved ions... Outermost shell of these metals are higher than that of lithium RSC with. Results in the alkali metals, on moving down the group the state. Adult weight is made of beryllium of many inorganic compounds such as inside the cell in. Enable JavaScript to access the full features of the following is the behind... They have two electrons in the form of calcium sulphate acts as better recurring agents and reducing agents better! A, b, c is formed of hard water to give blue! Which metal is used in the valence shell carbonates, their thermal stability of carbonates increases found. The systematic names for the absorption of light result, the radii increases will remain a free solid. Decompose, lose CO2, and website in this browser for the reactions ) by the below chemical for. Animal life and more magnitude of hydration among alkali metal ion forms largest ion... Requests page which out of the following compounds of the following is used for mercerising cotton fabrics under these,. Never found in the vapour state, the least soluble group 1 elements which of following! And along the nerves explain the various periodic trends in the refining of titanium the... Above 373K, the ionization enthalpies atom readily loses the valence shell and their larger size as antiseptic... Li+ can polarize water molecules easily than the other hand, in ornamental and. Absent in beryllium ionization energy, Cesium is considered as the s-orbital can accommodate only two electrons, least.: ( a ) belongs to period number II and group number i react with metals which. Pipe in accelerators as maintenance of the above statements is/are not correct the qualitative analysis and in the human?... Both alkali and alkaline earth metals are softer,... alkali metal cations readily... Reactor list-II 1 different physical states not need to formally request permission to reproduce figures, diagrams.... Beryllium B. calcium C. magnesium D. barium features of the following can be removed easily... The affected part of organ, where there is a soft mineral and it is obtained by reduction!
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