Question
Give a reason why covalent compounds exist as gases, liquids or soft solids?
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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:
| Element | Element | Type of bond likely in molecule of | Formula of compound |
|---|---|---|---|
| A: At. no. = 20 | B: At no. = 8 | A and B | |
| A: At no. = 20 | C: At no. = 17 | A and C | |
| D: At. no. = 9 | D: At. no. = 9 | D and D | |
| E: At. no. = 12 | F: At. no. = 16 | E and F | |
| G: At. no. = 1 | F: At. no. = 16 | G and F |
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.
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