Fill in the blanks by choosing the correct answer from the bracket: (a) Carbon tetrachloride is a ............... [polar / non-polar] covalent molecule. (b) During electrolysis of acidulated water, the gas liberated at the anode is ............... [oxygen / hydrogen].

State the terms for the following: (a) The group obtained by removing one hydrogen atom from the parent alkane. (b) Two metal plates or wires through which the current enters and leaves the electrolytic cell. (c) The amount of substance which contains the same number of units as the number of atoms in carbon-12. (d) The tendency of an atom to pull a shared pair of electrons towards itself in a compound. (e) The formula which represents the simplest ratio between the atoms of elements present in a compound.

Match the Column A with Column B: Column A Column B (a) Water 1. Lithium (b) Alkali metal 2. Iodine (c) Halogen 3. Covalent compound (d) Calcium oxide 4. Acetic acid (e) Weak acid 5. Ionic compound 6. Sulphuric acid

Give reasons for the following: (a) Inert gases do not form ions. (b) Covalent compounds have a low melting and boiling point.

X - HCl ⇋ H1+ + Cl- (in solution state) Y - PbBr2 ⇋ Pb2+ + 2Br1- (in molten state) From the above reactions X or Y, identify the reaction which exhibits: (a) electrolytic dissociation (b) ionization

Draw the electron dot structure of: (a) Methane molecule (b) Nitrogen molecule [Atomic number: N = 7, C = 6, H = 1]

In a water molecule, the oxygen atom has: (a) One shared pair of electrons (b) Three shared pairs of electrons (c) Two lone pairs of electrons (d) One lone pair of electrons

Choose the answer from the list which fits in the description: [CCl4, PbO, NaCl, CuO, NH4Cl] (a) A compound which undergoes thermal dissociation. (b) An amphoteric oxide. (c) A compound which is a non-electrolyte.

Draw the dot and cross structure of the following: (a) An ionic compound formed when Mg reacts with the dilute HCl. (b) A covalent compound formed when H2 reacts with Cl2. (c) The positive ion produced when ammonia gas is dissolved in water. [ Atomic number: Mg = 12, Cl = 17, H = 1, N = 7 ]

Element A belongs to group 15 and period 2 of the Periodic Table. (a) Identify the element A. (b) Write the formula of the compound formed when element A combines with hydrogen. (c) Draw the dot (•) and cross (×) structure of the compound formed in (b) above.

Define / State: (a) Electronegativity. (b) Gay-Lussac’s law of combining volumes.

Draw the electron dot structure for the following: (a) Ammonium ion (b) A molecule of nitrogen [At. No.: N=7, H=1]