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ICSE Class X Notes 2020 : Chemistry : Chemical Bonding

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Sia Sen
Euroschool Airoli, Mumbai
10th icse

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Important Question: ICSE 2010 Class 10th (Chemical Bonding) Q.1. Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one : i. forms anion negative ion; ii. forms cation positive ion; iii. has 4 electrons in the outermost orbit. Ans : i. Y ii. Z iii. X. Q. 2. Name a covalent compound which becomes electrovalent when dissolved in water. Ans : - HCl or NH3. Q. 3. Elements A, B and C have atomic number 9, 20 and 10 respectively. State which one is (1) a non-metal; (2) a metal; (3) chemically inert. ii. Write down the formula of the compound formed by two of the above elements. i. Ans : - (i) (1) A (2) B (3) C (ii) BA2 . Q. 4. Draw electron dot diagram to depict the formation of : (i) Magnesium oxide from 24 Mg12and 16O8. (ii) a molecule of chlorine from two atoms of 35 Cl17 . Ans.: .. (i) Mg : + : O : MgO .. .. .. .. (ii) :Cl . + . Cl : : Cl : Cl : .. .. .. .. Q. 5. (a) Write down the electronic configuration of the following: (i) 27X 13

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