(iii) An organic compound 'X' contains carbon, oxygen and hydrogen only. The percentage of carbon and
Given below is a diagram showing the placement hydrogen are 47.4% and 10.5% respectively. The
of five different oxides. With respect to the given relative molecular mass of 'X' is 76. Find the empirical
diagram answer the following questions: formula and the molecular formula of 'X'.
[Atomic weight: C=12, O=16, H=1]
Na2O CuO Question 7
ZnO
SO2 (i) Seema added a few pieces of copper turnings to a
Fe2O3 test tube containing concentrated acid P and she
noticed that a reddish-brown gas evolved.
(a) Name the acid P used by Seema.
Basic Acidic
Region X (b) write a balanced chemical equation for the
oxides oxides reaction that took place.
(a) Name the type of oxide represented in region X (ii) Answer the following questions with reference to
in the diagram. the concentration of bauxite ore.
(b) Identify the oxide which has been incorrectly (a) Name the process used to concentrate the ore.
placed in the above diagram. (b) Give a balanced chemical equation for the
(c) Name the oxide from the above diagram which conversion of aluminium hydroxide to pure
will form an alkali when dissolved in water. alumina.

Column A Column B a. N2 + 3H2  2NH3 1. Vanadium
Justify the following statements: (iv) Study the table given below. Use only the letters
(a) Anode is known as the oxidising electrode. given in the table to answer the questions. Do not
(b) Graphite electrodes are preferred in the identify the elements.
electrolysis of molten lead bromide. IA IIA IIIA IVA VA VIA VIIA 0

Column A Column B a. N2 + 3H2  2NH3 1. Vanadium
Give one significant observation when: (i) Given below are two sets of elements from two
(a) a solution of barium chloride is added to zinc different periods.
sulphate solution. Name the element with the highest ionisation
(b) lead nitrate is heated in a test tube. potential in each of the following sets.
(c) chlorine gas is passed over moist starch iodide (a) Al, Cl, Mg
paper. (b) Ne, O, F

Column A Column B a. N2 + 3H2  2NH3 1. Vanadium
A student was instructed by the teacher to prepare Pentoxide
and collect ammonia gas in the laboratory by
b. 4NH3 + 5O2 → 4NO + 2. Nickel
using aluminium nitride. The student had set up
6H2O
the apparatus as shown in the diagram below.
Study the given diagram and answer the following c. 2SO2 + O2  2SO3 3. Iron
questions: d. C2H4 + H2 → C2H6 4. Concentrated
X Ammonia gas Sulphuric acid
e. CuSO4.5H2O → CuSO4 5. Platinum
+ 5H2O
Y (v) (a) Draw the structural diagram for the following
Aluminium organic compounds:
nitride Water 1. 2-methyl propene 2. butanal
(b) Give IUPAC name for the following organic 3. H
compounds: |
1. Cl Cl H — C — H H H
| | | | |
H—C—C—H C=C — C — C — H
| | | | | |
Cl Cl H H H H
H H H
O
2. H C C C C
O—H
H H H
SECTION – B (40 Marks)
(Attempt any four questions from this Section)
Question-3 (iii) Name the gas produced during each of the following

Column A Column B a. N2 + 3H2  2NH3 1. Vanadium
The atomic number of two atoms 'X' and 'Y' are 14 reactions:
and 8 respectively: (a) When copper is treated with hot, concentrated
State nitric acid.
(a) the period to which 'X' belongs. (b) When ammonia is burnt in an atmosphere of
(b) the formula of the compound formed between oxygen.
'X' and 'Y'. (c) When ferrous sulphide reacts with dilute
(Do not identify X and Y) hydrochloric acid.

Column A Column B a. N2 + 3H2  2NH3 1. Vanadium
The reaction between concentrated sulphuric acid
E J Q
and magnesium can be represented by the equation
given below: L G
Mg + 2H2SO4 ® MgSO4 + 2H2O + SO2 M D P
If 60 g of magnesium is used in the reaction, N
calculate the following: (a) State the valency of element 'G'.
(a) The mass of sulphuric acid needed for the (b) Which element can exhibit catenation?
reaction. (c) Write the formula of the compound formed
(b) The volume of sulphur dioxide gas liberated at between 'M' and 'P'.
S.T.P.
[Atomic weight: Mg=24, H=1, S=32, O=16] Question 5

(ii) Ammonia gas is passed over heated copper (II)
A gas cylinder can hold 150 g of hydrogen under oxide in a combustion tube:
certain conditions of temperature and pressure. If (a) Name the gas evolved
an identical cylinder with the same capacity can (b) What will be the colour of the residue that is
hold 450 g of gas 'G' under the same conditions of left in the combustion tube at the end of the
temperature and pressure, find: reaction?
(a) the vapour density of the gas 'G'. (iii) Give balanced equations for the following:
(b) the molecular weight of gas 'G'. (a) Action of dilute hydrochloric acid on ammonium