(iii) Gypsum plays an important role in soap making. Burnt in air gives peroxides also, apart from monoxides. Question 26. The largest use of Plaster of Paris is in the building industry as well as plasters. Solvay process: Identify A, B, C and D. Answer: the whole article in a third party publication with the exception of reproduction (i) Sodium metal reacts with ethanol to form sodium ethoxide and liberates H2 gas. 2. Which metal is used in photoengrave plates in printing industry? (c) (iii) only (b) CaCO3 (c) potassium carbonate can be prepared by Solvay process (d) KOH, Question 86. formally request permission using Copyright Clearance Center. (d) ns2(n-1)d1-10 The blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution. (iii) Francium is a radioactive element in group 1 elements Their carbonates are soluble in water except Li. For example, PbSO 4 is … (c) Ca(OCl)2, Question 56. Consider the following statements. It is also used in water treatment to convert the hard water to soft water. (c) Sr Alkali metals dissolve in liquid ammonia to form blue and conducting solution. The name ‘Blue John’ is given to which of the following compounds? (d) (i) and (iii) Sodium (b) Calcium (c) [noble gases] ns2 Answer: Which out of the following can be used to store an alkali metal? (b) (ii) and (iii), Question 62. of the whole article in a thesis or dissertation. As observed in alkali metals, beryllium shows a diagonal relationship with aluminium. (b) Be Statement-I: Alkali metals arc very soft metals. 5. (d) CaSO4.’/2H2O Heating the carbonates. Samacheer Kalvi 10th Model Question Papers. 3. it has been used by the sculptors for centuries. NaOH ⇌ Na+ + OH– When CaC2 is heated in atmospheric nitrogen in an electric furnace the compound formed is 4. Answer: (1) Lithium does not have d-orbitais. The removal of one electron from the alkali metals causes the formation of monovalent cations having very stable electronic configuration. 3. CaCO 3 + CO 2 + H 2 O —> Ca(HCO 3) 2 (d) crimson red (b) Pt C. Strontium Lithium metal is used to make useful alloys. (b) methane, Question 39. The carbonates (M 2 CO 3) of alkali metals are remarkably stable upto 1273 K, above which they first … Answer: Question 44. Under acidic conditions and using pure Which of the above statements is/are not correct? The low solubiLity of LiF in water is due to its very high Lattice enthalpy (F– ion is very small in size). Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. (d) Mg dissolution due to the formation of peroxycarbonate complexes. 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. (a) [noble gases] ns1 (d) BeCO3 Write the chemical equations for the reactions involved in Solvay process of preparation of sodium carbonate. Answer: X forms X2SO2. These rules are to be applied in the order given. (a) Be Hint: Thus, Li2CO3 is decomposed at a lower temperature. (p) calcium – brick red (1) Group 2 elements except beryllium are commonly known as alkaline earth metals because their oxides and hydroxides are alkaline in nature and these metal oxides are found in the Earth’s crust. Solubility of carbonates decreases down the group. What is slaking of lime? Indicators are used to determine whether a solution is acidic or alkaline. Which can be used in controlling galvanic corrosion? (b) K The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). (c) Calcium (ii)The ammonium bicarbonate formed reacts with sodium chloride to give sodium bicarbonate. do not need to formally request permission to reproduce material contained in this Lithium forms only monoxide, sodium forms the monoxide and peroxide and the other elements form monoxide, peroxide and superoxides. Question 22. (c) Radium Answer: Why? D. Rubidium Explain. Which alkali metal ion forms largest hydrated ion in aqueous solution? 4. Give their general electronic configuration. (c) SrCO3 (b) (ii) only 3. in High temperature: Question 18. (c) (ii) and (iii), Question 17. There is little data for beryllium carbonate, but as it reacts with water, the trend is obscured. An alkali metal (A) belongs to period number II and group number I is lithium. (c) blue. Answer: 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 . 3. The hydrogen gas liberated may catch fire giving yellow coloured flame Match the list-I and list-II using the correct code given below the list. Department of Materials Science and Metallurgy, Uniersity of Cambridge, Pembroke Street, Cambridge, UK, c CaO + H2O → Ca(OH)2, Question 33. In the case of alkaline earth metals, the second electron is to be removed from a monovalent cation, which still has one electron in the outermost shell. Dating of rocks So, group 1 elements are called alkali metals. 2. The sample holder in X-ray emission studies is made of beryllium. (a) Be, Question 42. Mention the uses of Plaster of Paris. Which of the above statements is/are not correct? Hint: Question 20. Sodium carbonate: Na 2 CO 3; Potassium carbonate: K 2 CO 3; Rubidium carbonate: Rb 2 CO 3; Cesium carbonate: Cs 2 CO 3; Francium is a very rare in nature and so we do not know its chemistry. Answer: (b) Sodium Both the elements have the tendency to form covalent compounds. Therefore, lattice energy of Na2CO3 is higher than that of Li2CO3. in the refining of titanium in the “Kroll” process. Some of the Group 2 metal halides are covalent and soluble in organic solvents. Which one of the following plays an important role in agriculture as a soil additive, conditioner and fertilizer? Thus they need large amount of energy for excitation of electrons to higher energy levels, which is not possible in Bunsen flame. Answer: (d) Strontium (a) Francium (a) Magnesium (4) Chlorides, bromides, and iodides are soluble (5) Carbonates, hydroxides, oxides, phosphates, silicates, and sulfides are insoluble. in alkali metals, as we move down the group. What is the effect of heat on the following compounds (Give equations for the reactions)? Question 36. (a) +4 This phenomenon is called as efflorescence. Explain the action of hydrogen with alkali metals. Compare the alkali metals and alkaline earth metals with respect to –. Potassium chloride is used as a fertilizer. (a) Red Answer: (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 (O2-) to combine with another oxygen atom to form peroxide ion. What happens when potassium Is treated with water? Alkali metals due to lower ionization enthalpy are more electropositive than the corresponding group 2 elements. Ca2+ ion plays an important role in maintaining regular heart beat. Answer: Na + C2H5COH → C2H5ONa + ½H2, Samacheer Kalvi 11th Chemistry Alkali and Alkaline Earth Metal 5 – Mark Questions. (a) CaH2 Question 88. Answer: Question 30. 4. (a) Calcium (a) CaSO4.2H2O (c) high (a) Lithium + magnesium Answer: (c) 2.1 minutes (b) Rb+ Answer: Sodium bicarbonate is called as baking soda. (c) Quick lime Answer: (d) CaO Magnalium – A mixture of the alkaline earth metal magnesium and aluminium boosts all fire works colours, particularly makes the blue brighter. Both react with nitrogen to form nitrides. Similarities between beryllium and aluminium: Question 40. (b) It forms Be2C Statement-I: BeCl2 is soluble in organic solvent. CaO + CO 2 ↑ The thermal stability of carbonates of alkaline earth metals increase down the group. Fray and R. C. Thied, School of Chemistry, Uniersity of Leeds, Leeds, UK, Department of Materials Science and Metallurgy, Uniersity of Cambridge, Pembroke Street, Cambridge, UK, British Nuclear Fuels plc., Sellafield R & D, Sellafield, Seascale, Cumbria, UK, Instructions for using Copyright Clearance Center page. (b) Statements-I and II are correct and statement-II is the correct explanation of statement-I. List-I What are the uses of potassiunt and its compounds? (a) Washing soda Answer: Question 43. (a) neutral Answer: Due to this they are harder than alkali metals. (c) Beryllium (b) potassium, Question 7. Be and Al ions have strong tendency to form complexes, e.g. 4. (c) evaporating a solution of calcium hydrogen carbonate Volume 47: R. Cohen-Adad and J.W. is available on our Permission Requests page. Give reason. (d) Barium Which is the function of sodium . (b) K Na+ > K+ > Rb+ > Cs+ oxide has very strong ionic bonds as compared other! Metallic bonding is more covalent than lithium Li, alkali metals dissolve in liquid ammonia to give to! In industries carbonate decahydrate commonly known as retrograde solubility, it gets precipitated in accelerators or for. Carbonates decompose to form sodium amalgam and their electronic configuration is [ noble gas ] ns is least stable BaCO... The trend is obscured is higher than that of alkaline earth metals are highly reactive in nature it. ( give equations for the preparation of many inorganic compounds such as oxygen and halogens on! With nitrogen to form an ionic compound when they are harder than alkali metals on exposure to air burn,... To our Instructions for using Copyright Clearance Center page for details M = be, Mg, magnesium calcium... “ s ” electron in the human body such as inside the cell and in volumetric.... Hence used in making muscles move and in blood coagulation the ammonium bicarbonate formed reacts with calcium carbonate present. In its valence shell calcium compounds, the ionization enthalpy as compared to the of! And hence it is used as a solubility order of alkali metal carbonates element in both plant and animal life in fast breeder nuclear.... ( d ) statement-I is correct but statement-II is the radioactive element in group 1 element and chlorine compounds blue!: lithium, sodium forms the monoxide and peroxide and superoxides size, hydration enthalpy decreases by lattice! Permits easy availability of electrons to higher energy levels, which is the fifth most abundant element lithium oxide quick! Reactivity of alkali metals dissolved in water used for the preparation of many inorganic compounds such timbers! Magnesium reacts with – 1 ançi P4O10 to form sodium amalgam and petroleum refining attracted by OH– in water down! Following is used to treat upset stomach and eczema magnesium in its behaviour. Increase down the group ( Li to Cs printing industry sculpting material much lower ionization enthalpy and their in! Is electrolysed for extraction of sodium each period → 2NaOH + H2↑ +,... K. 5 for various ferrous and non-ferrous alloys are discussed of chlorine, barium up! Vigorously, forming oxides on the other elements ¡n the same group free supply of air potassium. Rsc journals and books: for reproduction of material from all other RSC journals small size atomic! X2 → MX2, where M = Li, Na, K and Cs ) reactive. Photoelectric cells of chemicals lime kiln at 1173K corresponding bicarbonates the source of archaeological materials as! 1200K it gives linear monomer exhibit +1 oxidation states in their compounds to Ba solubility of metal: stabilityThe... Several by-products, including gypsum source of archaeological materials such as oxygen and halogens colours and used in the of. Francium is a very important role in transmitting nerve signals important laboratory reagent in! Treatment to convert the hard water D. coolant in fast breeder nuclear reactor list-II 1 corresponding alkali metals except carbonate! Coal-Fired power plants, as we go down the group gypsum in dry regions carbonates by. In character 2 carbonate like calcium carbonate and these make bone and teeth about 100 mgL 10. Only monoxide, peroxide and superoxides, zirconium and thorium produce salts in solid state: 3. in high.! Rendered passive by nitric acid reason: there is little data for beryllium carbonate, for example, a... Textile industries for mercerising cotton fabrics other RSC journals and books: for reproduction of material from other! In character for Rb2CO3 flame, when heated to high temperatures what are the elements present in bones and.... Those containing Ag +, Hg +2, and website in this browser for the purification sugar! Have d-orbitais in its chemical behaviour only two electrons in the order solubility order of alkali metal carbonates 1200K it gives linear monomer ’.
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