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(a) cesium This happens because the alkali metal atom readily loses the valence electron in ammonia solution. Answer: Answer: NaCl is geologically stable. Alkali metals dissolve in liquid ammonia to give deep blue solutions that are conducting in nature. Is the metal more likely to he sodium (or) potassium. Question 38. How is barium peroxide prepared? What are the uses of calcium hydroxide? Answer: A. Lithium (d) Li is the best reducing agent in aqueous solution. as photoengrave plates in printing industry. Consider the following statements. Alkali metals combine readily with halogens to form ionic halides M+X–. Question 30. Answer: It is otherwise called as Glauber’s salt. For e.g. (d) Barium (b) K Why? Soda ash The thermal stability of carbonates increases with the increasing basic strength of metal hydroxides on moving down the group.Thus the order is The bicarbonates of all the alkali metals are known. Formula of gypsum is …………. The suspension of slaked lime in water is known as (NEET Phase – II) (d) 21 minutes 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. Which of the following is the least thermally stable? Ca(OH) 2 is slightly soluble. Why alkali metals have high chemical reactivity? Save my name, email, and website in this browser for the next time I comment. (b) basic Magnesium oxide has very strong ionic bonds as compared to magnesium fluoride. Answer: Answer: Identify A, B, C and D. Mention the uses of radium. Question 42. (b) p – 1, q – 2, r – 4, s – 5, t – 6, u – 3 Therefore lithium chloride dissolves in water. Which one of the following is used in fire extinguishers? Answer: The order of decreasing ionisation enthalpy in alkali metals is (i) Na > Li > K > Rb (ii) Rb < Na < K < Li The name ‘Blue John’ is given to which of the following compounds? 1. (a) Nitrates (b) Carbonates (c) Sulphates Answer: (a) Nitrates of both group 1 and group 2 elements are soluble in water because hydration energy is more than the lattice energy. Which of the following statements are incorrect? O2- contains one unpaired electron and hence it is paramagnetic. CO2 pressure an acidic melt is formed. Alkali metal carbonates and bicarbonates are highly stable towards heat and their It is also soluble in acetone due to dipolar attraction (Acetone is polar in nature). The order of decreasing ionization enthalpy in alkali metals is (a) ... Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to (a) ... Sol: (a) Unlike other alkali metal carbonates, the carbonate of lithium decomposes on heating to form its oxide. When it drops back to its actual energy level, the excess energy is emitted as light whose wavelength is in the visible region produces colour. Lithium aluminium alloy is used in making (d) Sodium (b) Mg(OH)2 8. Describe briefly the biological importance of calcium and magnesium. (b) CaF2 (c) Radium, Question 28. D. Plaster of paris. (b) Na+, K+ Which alkali metal ion forms largest hydrated ion in aqueous solution? Explain the action of halogen with alkali metals. 2. H2O. Answer: British Nuclear Fuels plc., Sellafield R & D, Sellafield, Seascale, Cumbria, UK. Carbonates exist as solid and insoluble in water. The fact that a small cation can stabilize a small anion and a large cation can stabilize a large anion explains the formation and stability of the oxides. (t) Cesium – (5) Crimson red Sacrificial anode As a de oxidizer, desulfurizer or decabonizer for various ferrous and non-ferrous alloys. (d) Beryllium 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. Solution: Option (i) is the answer. (d) SrCl2 (b) Rb+ At low temperatures or high CO 2 pressure an acidic melt is formed. (b) NaHCO3 Among alkali and alkaline earth metals, K, Rb and Cs alone forms superoxides. Thus, LiCO3 is decomposed at a lower temperature. Answer: Question 9. 2. Liquid Na metalli Li2CO3 is a covalent compound, whereas Na2CO3 is an ionic compound. (d) francium (d) Li2CO3 (a) heating calcium in oxygen D. Barium. Answer: (c) Chlorine gas is evolved at the cathode. (b) (ii) only. Question 22. (b) dead burnt plast (b) both assertion and reason are true but reason is not the correct explanation of assertion (c) electrochemical cell Answer: So, the hydrides behave as reducing agent. 10H2O. Alkali metals exhibit +1 oxidation states in their compounds. (c) CaCO3, Question 54. Carbonates of alkali metals are soluble in water with the exception of Li2CO 3. Question 29. (a) CaO D. Calcium. Hint: (c) CsBr (a) neutral (c) Its salts are rarely hydrolyzed (a) CaSO4.2H2O Consider the following statements. Answer: (d) Li, Question 23. Answer: How beryllium chloride is prepared from beryllium oxide? (d) Mg, Question 44. (b) CaF2 Beryllium is used to build the beam pipe in accelerators. Answer: (b) Pt Question 71. 1. Explain the various periodic trends in the alkali metals down the group. What happens when quick lime reacts with – (c) assertion is true but reason is false Alkali metal sulphates are more soluble in water than alkaline earth metals. in the removal of sulphur from iron and steel. Answer: Samacheer Kalvi 10th Model Question Papers. (a) Washing soda Due to its lowest ionization energy, Cs is considered as the most electropositive element. Answer: Answer: Question 6. Explain why this is so 9) The alkali and few alkaline earth metals impart colour to a flame, a property used in the flame test experiment; however, Be and Mg do not impart colour to a flame. Question 3. (b) The oxidation state of K in KO2 is +1. Sodium hydroxide is used as laboratory reagent. (c) ns2 np6 Upon heating, it looses the water of crystallization to form monohydrate. 0.54 < 0.86 < 0.97< 1.53< 1.90 (in g cm3). Answer: (a) Statements-I and II are correct and statement-II is the correct explanation of statement-I. (u) potassium – violet (3). (c) high Berllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. 3. (b) CaNCN Answer: Question 10. Answer: (c) [noble gases] ns2, Question 33. Question 74. None of the carbonates is anything more than very sparingly soluble. Compare the properties of beryllium with the other elements in the same group. 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. Which one of the following is used for mercerising cotton fabrics? Give reason why sodium bicarbonate is used in bakeries. The Solvay process is represented by the below chemical equations: Question 29. Answer: Solution: (a) MF < MCl < MBr < MI Answer: Question 28. Baking soda Gypsum is used to give colour to cosmetics and drugs. (c) Down process (c) Density : Li < Na < K < Rb Alkali and alkaline earth metals, themselves acts as better recurring agents and reducing agents, better than alkali metals. Important common features of group 2 elements. (d) Rb+, Cs+ (b) Calcium 1. Volume 47: R. Cohen-Adad and J.W. What happens when potassium Is treated with water? (d) Calcium, Question 69. Which of the following alloy is used in making white metal bearings for motor engines? (b) Caesium CaO + CO2 → CaCO3 (calcium carbonate). It is also used in water treatment to convert the hard water to soft water. School of Chemistry, Uniersity of Leeds, Leeds, UK, b
It is an important laboratory reagent used in the qualitative analysis and in volumetric analysis. (d) Ca3N2 (d) heating calcium oxide with carbon D. Coolant in nuclear reactor C. Softening of hard water Answer: (d) NaHCO3 (c) Na, K, Question 4. Reason: Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant. (c) assertion is true but reason is false How CO2 reacts with it? This may take some time to load. (c) potassium Answer: (c) Na,CO3 .10H2 O (b) +2 (d) ns2(n-1)d1-10 (c) (ii) and (iii), Question 17. (d) 2CaSO4.2H2O These elements exhibit +2 oxidation state in their compounds. RbO2 is …………. (c) Magnesium Consider the following statements. (c) Sr (d) both assertion and reason are false Give reason. Neutralisation is the reaction between an acid and a base. Barium is used List-I Answer: The exceptions are the alkali metal hydroxides and Ba(OH) 2. (d) Calcium, Question 29. Which metal is used in photoengrave plates in printing industry? Answer: Question 6. Answer: Answer: Question 31. Group-1 (alkali metals) carbonates M 2 CO 3: Li 2 CO 3, Na 2 CO 3, K 2 CO 3 etc., bicarbonates MHCO 3: LiHCO 3, NaHCO 3, KHCO 3 etc., Group-2 (alkaline earth metals) carbonates MCO 3: MgCO 3, CaCO 3, BaCO 3 etc., bicarbonates M(HCO 3) 2: Mg(HCO 3) 2, Ca(HCO 3) 2 etc., p-block elements carbonates _ Tl 2 CO 3 and PbCO 3: Transition elements carbonates _ This is due to the large size difference between Li and CO32- which makes the crystal lattice unstable. X forms X2SO2. X= F,Cl,Br and I. C. Calcium (b) strontium, Question 30. Question 36. D. NaOH (d) Be Physical properties of alkali metals : Question 20. Draw the tile structure of – Answer: Question 45. At high temperatures of the order of 1200K it gives linear monomer. Find the wrong statement ………… 3. (c) Statement-I is wrong but statementII is correct. (6) Sulfates are soluble except for calcium and barium. Answer: These ions perform important biological functions such as maintenance of ion balance and nerve impulse conduction. Which of the following is used in dentistry, ornamental works and making casts of statues? Answer: 3. Alkali metal hydroxide being basic in nature react with oxoacid ( such as H 2 CO 3), H 3 PO 4 HNO 3, H 2 SO 4 etc.) (c) Liquid Na metal, Question 85. This is known as ‘dead burnt plaster’. The second ionization enthalpy of alkali metals is 3. Correctly match the list-I and list-II using the code given below the list. (d) Lithium + copper (a) Li+ has minimum degree of hydration among alkali metal cations. Which one of the following metal act as co-factor in phosphate transfer of ATP by enzymes? which alkaline earth metal do not import colour to a non-luminous flame? 2.
(c) francium (b) peroxide and diamagnetic 4. Question 3. C. Gypsum 1. Alkali metals are highly reactive in nature. (b) [noble gas] ns1, Question 3. (d) The sodium amalgam thus obtained is treated with water to give sodium hydroxide. occurs and again the possible routes and products are discussed. (d) BaCO3 > CaCO3 > SrCO3> MgCO3 (a) (i) only In solid state: 6. (d) KOH, Question 86. (d) 2CaSO4H2O 2. This is due to the fact that group 2 elements have a higher nuclear charge, allowing the electrons to move towards the nucleus. You do not have JavaScript enabled. (d) Calcium 1. Question 15. Statement-II: Due to its lowest ionization energy, cesium is considered as the most electropositive element. What ¡s meant by setting of cement? (b) CaNCN Why? Alkali metals impart characteristic colours to the flame. (d) K (b) sodium carbonate is soluble in water and it is used in inorganic qualitative analysis (a) CaCl2 Answer: (c) (iii) only, Question 37. Their general electronic configuration is ns. Answer: (a) KO2 Alkali Metals: Question 6. NaOH Rock salt is major source of …………. Question 12. Beryllium is used in detectors due to its low density and diamagnetic nature. Both beryllium and aluminium are rendered passive by nitric acid. (a) Magnesium chloride (c) gypsum plaster In metallurgy, its compounds are used in pyrotechnics, petroleum mining and radiology. C2H5 OH Question 26. Answer: M2O, + 2H2O → 2M+ + 2OH– + H2O2 (b) Cs, Fr Sodium is stored in ……….. to form different slats such as metal carbonates, bicarbonates, sulphates, nitrates, etc. Answer: Question 17. Question 11. (a) Ca(OH)2 Why? (a) both assertion and reason are true and reason is the correct explanation of assertion Sodium – Potassium play an important role in transmitting nerve signals. CaSO4 .2H2O (a) +1 The loosely held “s” electron in the outermost shell of these elements make them as the most electropositive metals. with the reproduced material. (a) Na2 CO3 Question 11. (b) CaSO4.½H2O, Question 64. Question 23. (a) (i) only Question 6. Gypsum is a soft mineral and it is less soluble in water as the temperature increases. Therefore, the hydroxi des and carbonates of these metals are only sparingly soluble in water. (d) Be, He (d) K+ The solubility of carbonates decreases from Be to Ba. C. Potassium (d) both assertion and reason are false Magnesium carbonate, for example, has a solubility of about 0.02 g per 100 g of water at room temperature. Group 2 carbonates are virtually insoluble in water. (c) Baking soda, Question 91. (c) CaCl2 So X is Na2SO4. Properties of Sulphates of Alkali Earth Metals. All the bicarbonates (except which exits in solution) exist as solids and on heating form carbonates. (b) Gypsum (c) kerosene. (c) p – 4, q – 1, r – 2, s – 3, t – 5, u – 6 Lithium reacts with oxygen to form simple oxide lithium oxide (B). So, group 1 elements are called alkali metals. (d) Gypsum White washing (c) Quick lime (b) Magnesium C. Dentistry SiO3 Question 73. in alkali metals, as we move down the group. (b) heating calcium carbonate These ions participate in the transmission of nerve signals, in regulating the flow of water across cell membranes and in the transport of sugars and amino acids into cells. A. Chlorophyll (iii) Gypsum plays an important role in soap making. Alkaline earth metals have higher ionizatoin enthalpy values than alkali metals and they are less electropositive than alkali metals. (d) Calcium and magnesium chloride being more soluble than NaCl, remain in solution. Answer: Basicity of oxides: (d) Francium Question 8. Fetching data from CrossRef. Answer : Nitrates , carbonates and sulphates of Alkali metals are soluble in water . of the whole article in a thesis or dissertation. (c) CaO 2. This means that their lattice enthalpies are more, when compared to the sodium and potassium compounds. (a) Rb
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