Section I is compulsory. Attempt any four questions from Section II.
Attempt all questions from this Section
(a) Choose the correct answer from the options given below: 
(i) An electrolyte which completely dissociates into ions is:
B. Carbonic acid
D. Sodium hydroxide
(ii) The most electronegative element from the following elements is:
(iii) The reason for using Aluminium in the alloy duralumin is:
A. Aluminium is brittle.
B. Aluminium gives strength.
C. Aluminium brings lightness.
D. Aluminium lowers melting point.
(iv) The drying agent used to dry HCl gas is:
A. Conc. H2SO4
(v) A hydrocarbon which is a greenhouse gas is:
(b) Fill in the blanks with the choices given in brackets: 
(i) Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of ____________. (dehydration / dehydrogenation / dehydrohalogenation)
(ii) When sodium chloride is heated with concentrated sulphuric acid below 200ºC, one of the products formed is ____________. (sodium hydrogen sulphate / sodium sulphate / chlorine)
(iii) Ammonia reacts with excess chlorine to form ____________. (nitrogen / nitrogen trichloride / ammonium chloride)
(iv) Substitution reactions are characteristic reactions of ____________. (alkynes / alkenes / alkanes)
(v) In Period 3, the most metallic element is ____________. (sodium / magnesium / aluminium)
(c) Write a balanced chemical equation for each of the following reactions: 
(i) Reduction of copper (II) oxide by hydrogen.
(ii) Action of dilute sulphuric acid on sodium hydroxide.
(iii) Action of dilute sulphuric acid on zinc sulphide.
(iv) Ammonium hydroxide is added to ferrous sulphate solution.
(v) Chlorine gas is reacted with ethene.
(d) State one observation for each of the following: 
(i) Concentrated nitric acid is reacted with sulphur.
(ii) Ammonia gas is passed over heated copper (II) oxide.
(iii) Copper sulphate solution is electrolysed using copper electrodes.
(iv) A small piece of zinc is added to dilute hydrochloric acid.
(v) Lead nitrate is heated strongly in a test tube.
(e) (i) Calculate:
1. The number of moles in 12g of oxygen gas. [O = 16]
2. The weight of 1022 atoms of carbon.
[C = 12, Avogadro’s No. = 6 x 1023]
(ii) Molecular formula of a compound is C6H18O3. Find its empirical formula. 
(f) (i) Give the IUPAC name of the following organic compounds: 
(ii) What is the special feature of the structure of ethyne?
(iii) Name the saturated hydrocarbon containing two carbon atoms.
(iv) Give the structural formula of Acetic acid.
(g) Give the appropriate term defined by the statements given below: 
(i) The formula that represents the simplest ratio of the various elements present in one molecule of the compound.
(ii) The substance that releases hydronium ion as the only positive ion when dissolved in water.
(iii) The tendency of an atom to attract electrons towards itself when combined in a covalent compound.
(iv) The process by which certain ores, specially carbonates, are converted to oxides in the absence of air.
(v) The covalent bond in which the electrons are shared equally between the combining atoms.
(h) Arrange the following according to the instructions given in brackets: 
(i) K, Pb, Ca, Zn. (In the increasing order of the reactivity)
(ii) Mg2+, Cu2+, Na1+, H1+ (In the order of preferential discharge at the cathode)
(iii) Li, K, Na, H (In the decreasing order of their ionization potential)
(iv) F, B, N, O (In the increasing order of electron affinity)
(v) Ethane, methane, ethene, ethyne. (In the increasing order of the molecular weight) [H = 1, C = 12]
Attempt any four questions from this Section
(a) Draw the electron dot structure of:
(b) The pH values of three solutions A, B and C are given in the table. Answer the following questions:
(c) Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element.
(a) Name the particles present in:
(b) Distinguish between the following pairs of compounds using the reagent given in the bracket.
(c) Choose the method of preparation of the following salts, from the methods given in the list:
[List: A. Neutralization B. Precipitation C. Direct combination D. Substitution]
(a) Complete the following equations:
(b) Write a balanced chemical equation for the preparation of:
(c) Name the following organic compounds:
(a) Give the chemical formula of:
(b) Answer the following questions based on the extraction of aluminium from alumina by Hall-Heroult’s Process.:
(c) Match the alloys given in column I to the uses given in column II:
COLUMN I COLUMN II
(i) Duralumin A. Electrical fuse
(ii) Solder B. Surgical instruments
(iii) Brass C. Aircraft body
(iv) Stainless Steel D. Decorative articles 
(a) Identify the substances underlined:
(b) Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation:
2NaOH + CuSO4 → Na2SO4 + Cu(OH)2 ↓
(c) Find the empirical formula and the molecular formula of an organic compound from the data given below:
C = 75.92%, H = 6.32% and N = 17.76%
The vapour density of the compound is 39.5. [C = 12, H = 1, N = 14] 
(a) Name the gas evolved in each of the following cases:
(b) Study the flow chart given and give balanced equations to represent the reactions A, B and C: 
(c) Copy and complete the following table which refers to the industrial method for the preparation of ammonia and sulphuric acid: