46. In accord with their basic behaviour, they react with acids in typical acid-base reactions to produce salts and water; for example, M 2 O + 2HCl → 2MCl + H 2 O (where M = group 1 metal). The valency of Q IS 2 and Oxygen is also 2. zinc hydroxide Zn(OH) 2 They form basic oxides with the general formula RO (from R +2 and O-2). The oxides of the other Group 2 elements all adopt coordination number of 6. Therefore, the formula of oxide will be (f) In Formula of their chlorides. Formula of oxides: P 2 O: QO (vi) Formula of chlorides: PCI: QCl 2: Note: For parts (v) and (vi) examples using symbols of elements may also be accepted. Problem 42SQ from Chapter 2: Based on the formulas of other oxides of Group 2A elements, ... Get solutions Na 2 O + H 2 O→2NaOH NaOH (aq) is a strong base (pH 14) Na 2 O + H 2 SO 4 → Na 2 SO 4 + H 2 O. MgO + H 2 O → Mg(OH) 2 Mg(OH) 2 (aq) is only partially ionised and is a weak base (pH 10) MgO + 2HCl →MgCl 2 + H 2 O. Amphoteric oxide: hydrated aluminium oxide behaves as if it an approximate formula of Al(OH) 3 The formula for chloride will be: PCI. Compare their following characteristics in tabular form: (a) The number of electrons in their atoms (b) The sizes of their atoms (c) Their metallic character (d) Their tendencies to lose electrons (e) The formula of their oxides (f) The formula of their chlorides Since beryllium oxide is high stable, it makes BeCO 3 unstable. The periodic law of the elements states that the properties of the elements are a periodic function of a. atomic weights. Similarly, the valencies of all the elements listed can be predicted from their respective groups. Group 3A (ns 2 np 1) Boron is a metalloid; all other members of Group 3A are metals.The oxide formula is R 2 O 3 (from R 2 O 3 (from R b. M 2 O. c. MO 2. d. M 2 O 3. b. atomic numbers. This preview shows page 21 - 26 out of 26 pages.. MgS, CuS) M(OH) 2 hydroxide M 2+ (OH –) 2, often insoluble hydroxides, alkali if soluble e.g. Stability of oxides decreases down the group. Group II carbonates are mainly insoluble, and they do not react with The solubility decreases down the Group. (ii) All the alkaline earth metals form oxides of formula MO. The general formula for these reactions is M(OH) 2 (where M is the group 2 element). Click hereto get an answer to your question ️ Two elements 'P' and 'Q' belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Group 2 hydroxides are more alkaline down the group and reactivity down the group with water also increases as the first ionisation energy decreases. Group II carbonates react with acid to form salt, carbon dioxide and water M CO3(s) + H⁺ → M ²⁺(aq or s) + CO2(g) + H2O(l) ; where M = A Group II element Alkaline earth metals all have two valence electrons, and they easily oxidize to the +2 state. The Earth’s crust is mostly made up of oxides that are solid. The O represents oxygen which has an oxidation number of -2 when combined with metals to form oxides. 45. Its valency is 2. CaO is produced on a large scale for the cement industry. Amino acids are the monomers from which proteins are made. Therefore, the formula of it is K2O. The general structure of an amino acid as: where NH represents an amine group, COOH represents a carboxyl group and R represents a side chain The twenty amino acids that are common in all organisms differ only in their side group. The formula for chloride will be: QCI 2 (i) Potassium (K) is a member of group IA. This will help in writing the formulae of their oxides. 4.2.1.1 Reaction of Group 2 oxide with water : Properties of Group 2 hydroxide Beryllium oxide, BeO, is a white solid, which is insoluble in water, with coordination number of 4, as expected for the small Be2+ ion. A group 2 oxide would form water instead of hydrogen gas, and as for if it dissolves, I think it depends on is the metal hydroxide is a solid or aqeous as it could form a precipitate. An oxide is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. The oxide minerals can be grouped as simple oxides and multiple oxides.Simple oxides are a combination of one metal or semimetal and oxygen, whereas multiple oxides have two nonequivalent metal sites. (ii) Carbon (C) is a member of group … Two elements 'P' and 'Q' belong to the same period of the modern periodic table and are in Group -1 and Group -2 respectively. The valency of P is 1 and Oxygen is 2, so the formula of their oxide will be: P 2 0. Its valency is 1. Metal oxides typically contain an anion of oxygen in the oxidation state of −2. 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