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

Give a reason for each: (a) Ionisation potential decreases down a group. (b) Ionic compounds do not conduct electricity in the solid state.

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

Which of the following element pairs will form an ionic bond? Pair P Elements of Group 1 & Group 2 Q Elements of Group 14 & Group 16 R Elements of Group 2 & Group 17 S Elements of Group 15 & Group 18 (a) P (b) Q (c) R (d) S

The compound that has the highest melting point amongst the following is: (a) Methane (b) Sodium chloride (c) Ammonia (d) Ethanol

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.

Match the Column A with Column B: Column A Column B (a) Sodium chloride 1. has two shared pair of electrons (b) Methane 2. has high melting and boiling points (c) Hydrogen chloride gas 3. a greenhouse gas (d) Oxidation reaction 4. has low melting and boiling points (e) Water 5. Zn − 2e− ⟶ Zn2+ 6. S + 2e− ⟶ S2−

Fill in the blanks with the choices given in the brackets: (a) Metals are good ............... [oxidizing agents /reducing agents] (b) Non-polar covalent compounds are ............... [good / bad] conductors of heat and electricity. (c) Higher the pH value of a solution, the more is ............... [acidic / alkaline] it is. (d) ............... [Silver chloride / Lead chloride] is a white precipitate that is soluble in excess of Ammonium hydroxide solution. (e) Conversion of ethene to ethane is an example of ............... . [hydration / hydrogenation]

(a) State Avogadro’s Law. (b) Define Co-ordinate bond.

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

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

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].