Chemical Bonding quick revision Test - Class 10 ICSE CHEMISTRY

CHEMICAL BONDING - REVISION TEST - CLASS 10 ICSE

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The following question are from Chemical Bonding Class 10 ICSE CHEMISTRY. You can use this as a quick revision test.

a) Name the following.

1. The chemical bonding in which electron pairs are mutually shared between the atoms and both atoms contribute equal number of electrons.

2. The electrostatic force of attraction which holds two oppositely charged ions together.

3. The covalent bond in which shared pair of electron comes from the same atom.

4. The covalent bond in which the shared pair of electrons is not distributed equally between the atoms in the bonding.

5. A covalent molecule which contains triple bond between a pair identical atoms.

6. A polar covalent compound in which the central atom carries two lone pairs of electrons.

7. The metal  which loses two electrons and achieves the stable electronic configuration of Argon.

8. These compounds contain molecules only.

9. The element which has one valence electron but forms polar covalent compounds with non-metals.

10. A polar covalent compound which behaves like an ionic compound when dissolved in water.

b) Give Reason.

1. Elements with unstable electronic configuration participate in the formation of molecules/ compounds.

2. Ionic compounds conduct electricity in fused state or aqueous solutions but not in solid state.

3. Ionic compounds have high B.P and M.P but covalent compounds have low B.P and M.P.

4. Hydrogen chloride dissolves in water but Carbon tetra chloride does not dissolve on water.

c) 

1. Two elements A and B have 1 and 2 valence electrons respectively. If the element B contains diatomic molecules write balanced equation for the combination reaction between A and B.

2. Draw electron dot representation of:

i) Ammonia Molecule        ii) Hydronium ion 

Answers

a)

1. Covalent bond

2. Ionic/ Electrovalent bond

3.Coordinate covalent bond

4. Polar Covalent bond

5. Nitrogen

6. Ammonia

7. Calcium

8. Covalent compounds

9. Hydrogen

10. Hydrogen chloride

b)

1. Elements participate in bond formation to attain stable electronic configuration.

2. Ionic compounds in solid state does not contain free ions but in their fused state or aqueous solutions they contain free ions and conduct electricity.

3. Ions inn the ionic compounds are held with strong electrostatic force of attraction but covalent molecules are held with weak Van der waal's force of attraction.

4. Hydrogen chloride is a polar compound so dissolves polar solvent like water but Carbon tetra chloride is a non-polar compound

c)

1. 4A + B₂  --> 2A₂B

2. i) Ammonia molecule

ii) Hydronium ion