A compound has a formula = ‘H2Y’. Y denotes a non-metal. State the following: 1. The electronic configuration of Y. 2. The valency of Y. 3. The bonding present in ‘H2Y’ 4. The bonding present in the compound formed between potassium (19K39) and ‘Y’ 5. The formula of the compound formed between calcium (20Ca40) and Y. Open Answer »
Electronic configuration of the following elements are given: 1. Sodium — Na = 2, 8, 1 2. Hydrogen — H = 1 3. Carbon — C = 2, 4 4. Chlorine — Cl = 2, 8, 7 5. Lithium — Li = 2,1 State which of the compounds given below: (a) have high/low boiling points, (b) are soluble/insoluble in organic solvents. A : Hydrogen chloride B : Sodium chloride C : Sodium hydride D : Lithium chloride E : Carbon tetrachloride Open Answer »
Fill in the blanks with the correct word from the brackets: (i) The bond between two elements in group 17[VIIA] of the periodic table is likely to be ____ [ionic/covalent]. (ii) In the reaction of Cl2 + 2KI ⟶ 2KCl + I2 the conversion of 2I to I2 is deemed as ____ [oxidation/reduction]. (iii) The covalent molecule containing three single covalent bonds is ____ [water/methane/ammonia]. (iv) The molecule of water combines with a ____ [hydrogen atom/proton/hydrogen molecule] to form a hydronium ion. (v) For formation of an electrovalent bond between elements ‘X’ and ‘Y’ which are a metal and non-metal respectively, X should have a ____ [high/low] ionization potential and ‘Y’ a ____ [high/low] electron affinity. Open Answer »
Complete the table given below:ElementElementType of bond likely in molecule ofFormula of compoundA: At. no. = 20B: At no. = 8A and BA: At no. = 20C: At no. = 17A and CD: At. no. = 9D: At. no. = 9D and DE: At. no. = 12F: At. no. = 16E and FG: At. no. = 1F: At. no. = 16G and F Open Answer »
With reference to a molecule of water, fill in the blanks with the correct word. [at. no. of H = 1, O = 8] Water is a ____ [non-polar/polar] covalent molecule in which the atom of ____ [hydrogen/oxygen] attracts electrons more strongly towards itself. The water molecule shows the presence of ____ [double / one single / two single] covalent bond/s and ____ [one/two] lone pair of electrons present in the ____ [hydrogen/oxygen] atom. Open Answer »
Give reasons for the following: In the formation of MgO the magnesium atom (at. no. 12) loses two electrons from it’s valence shell. Open Answer »
Give reasons for the following: A non-metallic atom (at. no. 9) forms a molecule of the same, containing a single covalent bond. Open Answer »
Give reasons for the following: Iron displaces copper from a solution of a copper salt. The reaction is deemed as a redox reaction. Open Answer »
Give reasons for the following: MgCl2 is soluble in water but insoluble in acetone, while methane is insoluble in water, but soluble in acetone. Open Answer »
Give reasons for the following: NH3 gas a covalent compound does not conduct electricity but it’s aq. soln. NH4OH is a weak electrolyte. Open Answer »