Chemical Bonding Three Marks Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    10 x 3 = 30
  1. What is covalent bond? Give suitable examples to represent single, double and triple covalent bonds.

  2. Define co-ordinate covalent bond.

  3. Bond angle in PH+4 is higher than in PH3. Why?

  4. Compare the bond angles of water and dimethyl ether and identify which one has the greater bond angle? Give appropriate reason for your answer

  5. Identify tbe paramagnetic species among following using molecular orbital theory.

  6. Draw the lewis structure of (I)Ammonia (il) Methane (iil) Dinitrogen pentoxide.

  7. Calculate the bond enthalpy of OH bond in water.

  8. Explain how the ionic character in a covalent bond is related to electronegativity?

  9. Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, 0, N, Br.

  10. Apart from tetrahedral geometry, another possible geometry for CH4 is square planar with four H atoms at the corners of the square and C atom at its centre. Explain why CH4 is not square planar?

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