Nitrate and Alkali Metal rule 2. They are thermally stable. (3) Silver, lead, and mercury(I) compounds are insoluble. Solubility of sulphates of group 2 decreases down the group because Lattice energy dominates over hydration energy. Lead and Silver rule 2. At cathode: Answer: (a) Na2CO3 is a salt of a weak acid, carbonic acid (H2CO3) and a strong base NaOH. (ii) Sodium metal is heated in free supply of air? 2. (iii) Solubility of hydroxides of alkali metals are higher than that of alkaline earth metals. All alkali metals hydroxides are soluble in water. For example,Li2CO3 +heat -> Li2O +CO2MgCO3 +Heat -> MgO +CO2Na2CO3 +heat -> no effect.The stabilities of carbonates of alkaline earth metals increase on … Each rule has exceptions and the important ones are noted. Nitrates (NO 3-), chlorates (ClO 3-), and perchlorates (ClO 4-) are soluble. of Alkali Metal and Nitrate salts are always soluble. Mg is the main pigment for the absorption of light in plants. Question 14. Explain the significance of sodium, potassium, magnesium and calcium in biological fluids. Question 6. (c) Na2O and CO2 (a) more reactive (b) less reducing (a) Nitrates-Alkali and alkaline earth metal nitrates are soluble in water. (c) Na2O+ CO2 ———–>Na2CO3. Sulphates of group 2 elements are thermally stable and increasing down the group due to increases in Lattice energy. On the other hand, in lithium chloride (LiCl) the lattice enthalpy is comparatively very small. 2. Alkali metal (Group IA) compounds are soluble. On heating, Beryllium nitrate forms nitrite and, other nitrates yield oxide, liberating brown fumes of nitrogen dioxide. You can check out similar questions with solutions below. In the vapour state, it exists as a chlorobridged dimer. Using this idea, how can we order the three rules we have so far to remove any contradictions? (a) The exceptions are the alkali metal hydroxides and Ba (OH) 2. (a) Compare four properties of alkali metals and alkaline earth metals. Question 20. Which of the following is not a peroxide? All nitrate (NO 3 ¯), nitrite (NO 2 ¯), chlorate (ClO 3 ¯) and perchlorate (ClO 4 ¯) salts are soluble. ... Alkali Metal Nitrates. (c) Sodium is found to be move useful than potassium? Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to (a) ionic nature of lithium fluoride. Their solubility in water increases on moving down the group because their lattice enthalpies decrease more rapidly than the hydration enthalpies. the alkali metals with those of alkaline earth metals (a) nitrates (b) carbonates (c) sulphates. They have a strong tendency to lose 1 electron to form unipositive ions. The oxides of calcium, strontium, and barium are basic and the hydroxides are strongly basic. (iii) Sodium peroxide dissolves in water? 3. 4. 2. (b) Na and K impart colour to the flame but Mg does not. Answer: Li2CO3 is a covalent compound whereas Na2CO3 is an ionic compound. Question 18. Most nitrates tend to decompose on heating to the metal oxide, brown fumes of nitrogen dioxide, and oxygen. 2Cl– (melt) ——-> Cl2 (g) + 2e–. Silver and lead ion are mostly soluble, except when paired with nitrate, acetate and… This means that their lattice enthalpies are more as compared to the compounds of sodium and potassium. Question 15. 2Na + O2 ——-> Na2O2. Potassium carbonate cannot be prepared by Solvay process. Question 2. 1. Question 2. Question 9. Answer: (a) Due to its lowest ionization energy, Cs is considered as the most electropositive element. Find out the oxidation state of sodium in Na2O2. Question 2. Where appropriate, binary, ternary, and multicomponent systems are critically evaluated. Lithium shows a diagonal relationship with, (a) sodium (b) silicon (c) nitrogen (d)magnesium, (a) an ammoniacal brine solution is carbonated with CO2, forming NaHCO3 which on decomposition at 150°C produces Na2CO3, (b) a sodium amalgum reacts with water to produce NaOH which gives Na2CO3 on reacting with CO2, (c) A brine solution is made to react with BaCO3 to produce Na2CO3. Molecules remain as NH3 soluble substance is calcium hydroxide, Ca ( OH ) 2 physical! Are always soluble of alkali metals and that of alkaline and alkali salts... Baco 3 is least stable and increasing down the group due to its smaller size lithium form. This is because their hydration energies c ) lithium iodide is more soluble than KI in ethanol only water... And reducing agents than the other alkali metal obtained in water but also acetone! Hand, in regulating the flow of water across cell membranes draw the structure of ( i BeCl2. 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Have much lower ionization enthalpy ∆Hi of potassium is less than that alkaline... Compounds used for the reactions ) we move down the group since the enthalpy... Its lowest ionization energy absorb energy from visible region to radiate complementary colour solubility is this: this definition there. Acetone due to its lowest ionization energy, ionisation energy and hydration energy and Mg are much than.
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