Atomic size goes on increasing down the group. Alkali metals are highly reactive in nature. In the vapour state, it exists as a chlorobridged dimer. (d)Since, among alkali metals, lithium has the most negative electrode potential (E° = -3.04 V) so, it is the strongest reducing agent in the aqueous solution. Question 13. Question 2. LiCl is soluble in water because its hydration energy is higher than its lattice energy. energy levels which is not possible in bunsen flame. Answer:  Beryllium does not impart colour to a non-luminous flame. Question 20. Question 12. Share with your friends. Heating a barium-containing alloy to high temperatures will cause some ionization to occur, providing the initial step in forming a spark. Answer: Question 3. 2Na- Hg + 2H20——>2NaOH +H2 +Hg Why are potassium and caesium, rather than lithium used in photoelectric cells? They are thermally stable. Question 24. What is soda ash? (a) a solution of Na2CO3 is alkaline? Question 7. Which of the following is not a peroxide? 800+ SHARES. (b) a sodium amalgum reacts with water to produce NaOH which gives Na2CO3 on reacting with CO2 Alkali metals are highly electropositive in nature. Answer:  It is called Nitrolime. For example, quicklime ( CaO) reacts with water to give slaked lime, which is slightly soluble. 400+ VIEWS. ... Reactivity of with water (and solubility of metal hydroxides) increases down the group. (a) 2. (b) What happens when alkali metals are dissolved in ammonia? Answer: Potassium carbonate being more soluble than sodium bicarbonate does not get precipitated when CO2 is passed through a concentrated solution of KCl saturated with ammonia. Of the three metals listed, Ba has the lowest ionization energy and thus releases electrons most readily. Why does the solubility of alkaline earth metal hydroxides on water increase down the group. Answer: Since BeCl2 is a covalent compound it is soluble in organic solvent. Question 2. Which alkali metal ion forms largest hydrated ion in aqueous solution? (b) Lithium is the only alkali metal to form a nitride directly. (iii) Sodium peroxide (iv) Sodium carbonate? Answer: NaOH is more basic. 2Cl– (melt) ——-> Cl2 (g) + 2e–. Answer: The low solubility of LiF in water is due to its very high lattice enthalpy (F–  ion is very small in size). This means that the magnitude of hydration enthalpy is quite large. (b) 2KO2 + 2H2O ———-> 2K0H + O2+ H2O2 Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone? Sulphates of group 2 elements are thermally stable and increasing down the group due to increases in Lattice energy. Na+ + e– —–> Na 2Na + O2 ——-> Na2O2. Answer:  Sodium peroxide is formed. (d). Question 16. (c) Ee for M2+ (aq) + 2e– —> M(s) (where M = Ca, Sr, or Ba) is nearly constant. Berrylium hydroxide (Be (OH) 2) and magnesium hydroxide (Mg (OH) 2) are completely insoluble in water. Answer: Question 3. Li+ ion has the highest polarising power. The hydroxides become more soluble as you go down the Group. Hydroxides of alkali earth metals are much less soluble. (iii) Sodium peroxide dissolves in water? Question 29. Whereas  BeSO4 is ionic in nature and its hydration energy dominates the lattice energy. Therefore, Lattice energy of Na2CO3 is higher than that of Li2CO3. Because of high nuclear charge the ionization enthalpy of alkaline earth metals are higher than those of the corresponding alkali metals. (a) Li (b) Na (c) K (d) Cs Li+ < Na+ Cl alkali metals with those of the alkaline earth metals. 2Cl-(aq) – 2e- ———> Cl2(g). Starting with sodium chloride how would you proceed to prepare. Hydrides as well as halides of alkaline earth metals tend to polymerize On the other hand, in lithium chloride (LiCl) the lattice enthalpy is comparatively very small. Give the important uses of the following compounds. (b) Lattice enthalpy of LiF is maximum among all the alkali metal halides. The hydroxides of alkali metals are more soluble than those of alkaline earth metals. Question 8. Answer: BeCl2 (vapour) Hydroxides of the lighter alkaline earth metals are insoluble in water, but their solubility increases as the atomic number of the metal increases. (b) Because the discharge potential of alkali metals is much higher than that of hydrogen, therefore when the aqueous solution of any alkali metal chloride is subjected to electrolysis, H2, instead of the alkali metal, is produced at the cathode. Question 32. Question 10. Which of the following is not a peroxide? Describe two important uses of each of the following: , (ii) Basicity of oxides. Metal hydroxide Ksp Metal hydroxide Ksp Be (OH)2 1.6 × 10-26 Sr (OH)2 3.2 × 10-4 Some examples may help you to remember the trend: Magnesium hydroxide appears to be insoluble in water. Question 14. That is why these metals are not obtained by chemical reduction methods. Although it describes the trends, there isn't any attempt to explain them on this page - for reasons discussed later. They form oxides and hydroxides and these compounds are basic in nature. What is the effect of heat on the following compounds (Give equations for the reactions)? (d) all of the above Properties of alkali and alkaline earth metals hydroxides in periodic table. 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Question 16. (b) Due to its smaller size lithium can form nitride directly. Question 5. Why is BeCl2 soluble in organic solvent? 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.

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