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

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

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

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].

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]

The following table shows electronic configuration: Element Electronic configuration A 2,8,8,2 B 2,6 C 2,8,7 D 2,4 (a) Write the formula of the compound formed between: (i) A and B (ii) D and C (b) Which element exhibits catenation?

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]

The diagram given below shows the bonding in the covalent molecule AB2. Which option represents the correct electronic configuration of atoms A and B before combining together to form the above molecule? Option A B (a) 2, 4 2, 8, 6 (b) 2, 4 2, 8, 7 (c) 2, 8 2, 8, 8 (d) 2, 6 2, 8, 7