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M P Keshari » ICSE(IX) GUESS PAPER IN CHEMISTRY FOR 2012.

ICSE(IX) GUESS PAPER IN CHEMISTRY FOR 2012.

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ICSE (IX)  Guess Paper in Chemistry for 2012.

Time 1 ½ hrs]                                 Chemistry                         [Max. Marks = 80.

Section – I (40 Mark)

Answer ALL questions.

Q.1.

(a) With reference to interconversion of matter, explain the meaning of

‘Vapourization’.                                                                                                     [2]

(b) Explain the change of state of matter on the basis of kinetic theory of matter with

reference to ‘Solidification’ – on cooling a liquid at its freezing point.               [2]

(c) Explain briefly how you would obtain CO from a mixture of CO and CO2.       [2]

(d) What is mean by “Atomicity of a gas”. Name two diatomic gases.                     [2]

(e) Give one example each of two different types of homogeneous and heterogeneous

mixtures.                                                                                                               [2]

(f) Name a non-metallic element which :

(1) is a liquid at ordinary temperature,            (2) is a conductor of electricity.          [2]

(g) XCl2 is the chloride of a metal X. State the formula of the sulphate and the hydroxide

of the metal X.                                                                                                        [2]

(h) Write the name of  the following compounds :

(1) NaOH,       (2) HNO3,       (3) H2SO4,       (4) KMnO4.                             [2]

(i) Explain : ‘Silver nitrate solution is kept in coloured reagent bottles in the

laboratory.                                                                                                              [2]

(j) Give reason why magnetizing a piece of steel is a physical change.                      [2]

(k) How does an increase in temperature affect : (1) the solubility of NaCl, (2) the

solubility of CaSO4 in water.                                                                                [2]

(l) Give reason for the following :

(1) table salt becomes moist and sticky during the ainy season,

(2) a white powder forms on the surface of washing soda crystals which are left

exposed to the air.                                                                                      [2]

(m) Define the terms : atomic number, mass number.                                                [2]

(n) Ordinary chlorine gas has two isotopes : 35Cl17 and 37Cl17 in the ratio of 3:1.

Calculate the relative atomic mass(atomic weight) of chlorine.                            [2]

(o) Write down the electric configuration of the following:

(1)        27X13 (2)        35Y17.                                                               [2]

(p) What is a proton. What is the significance of the number of protons found in the atoms of each of the different elements.                                                                     [2]

(q) Name the elements in Period 1 and Period 2.                                                       [2]

(r) What do you mean by a Group in the Periodic Table. How many Groups are there in the Periodic Table.                                                                                                          [2]

(s) What do the following symbol represent: 2H, H2, H+.                                         [2]

(t) Why is copper not used to prepare hydrogen by the action of dilute hydrochloric acid or dilute sulphuric acid?                                                                                                 [2]

 

Section – II (40 Marks)

Answer ANY FOUR questions.

Q.2.

(a) Explain the meaning of the term ‘interconversion of three states of matter’. Give a diagrammatic representation of the interconversion of the three states of matter with reference to ice as a solid state, water as a liquid state and steam as a gaseous (vapour) state.                                                                                                                              [3]

(b) Define melting point. Describe a simple experiment to determine the melting point of wax.                                                                                                                              [3]

(c) With the help of a neat labeled diagram, give a simple experiment to demonstrate the sublimation of iodine . What is meant by the term ‘sublimate’.                                  [4]

Q.3.

(a) State and explain Boyle’s Law for gases. At 0º C and 760 Hg pressure, a gas occupies a volume of 100 cm3. The Kelvin temperature (Absolute temperature) of gas is increased by one-fifth while the pressure is increased one and a half times. Calculate the final volume of the gas.                                                                                                       [4]

(b) Differentiate element, compound and mixture giving at least three points.         [3]

(c) Dilute hydrochloric acid is added in turn to a mixture of iron and sulphur and to the compound formed between iron and sulphur. Name the gas formed in each case.

Name the process used to separate the constituents of liquid air.                        [3]

Q.4.

(a) Explain the term ‘chemical formula’. What is meant by ‘reactants’ and ‘products’ in a chemical equation. State why the molecular formula of zinc carbonate is ‘ZnCO3’. [3]

(b)                    CaCO3 + 2HCl [dil] → CaCl2 + H2O + CO2 [g]

State the information provided by the above chemical equation. State the information not conveyed by the above chemical equation.                                            [3]

(c) Write balanced equations for the following word equations : [4]

(1) Calcium + Water                                       → Calcium hydroxide + Hydrogen.

(2) Iron + Hydrochloric acid                           → Iron [II] chloride + Hydrogen.

(3) Potassium bromide + Chlorine                  → Potassium chloride + Bromine.

(4) Calcium hydroxide + Ammonium chloride → Calcium chloride + water + Ammonia.

Q.5.

(a) State in each case if the reaction represents oxidation or reduction :

(1)        Fe++ → Fe+++

(2)        Cl → Cl

(3)        Cu++ → Cu

(4)        Ag → Ag+

(5)        H → H+

(6)        Al → Al+++ [3]

(b) State three points of difference between physical and chemical changes with reference to: (1) composition and mass of the substance, (2) nature of the change, (3) energy change during the change.                                                                                            [3]

(c) Define solubility. Give the main steps with the calculations involved of the method to determine the solubility of sodium chloride in water. Name a salt whose solubility (1) increases, (2) decreases, (3) is fairly independent or slightly increases – with rise in temperature of water.                                                                                                            [4]

Q.6.

(a) 24Mg12 and 26Mg12 are symbols of two isotopes of magnesium. Compare the atoms of these isotopes with respect to :

(1) the composition of their nuclei.

(2) their electronic configurations.

(3) give the reason why the two isotopes of magnesium have different mass

numbers.                                                                                                          [3]

(b) Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one : (1) forms anion – negative ion, (2) forms cation – positive ion, (3) has 4 electrons in the outermost orbit.                                                                                                          [3]

(c) Copy and complete the following table relating to the atomic structure of some elements:                                                                                                                     [4]

Element Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons
Beryllium 4 9
Fluorine 9 10
Sodium 12 11
Aluminium 27 13
Phosphorus 31 15

Q.7.

(a) What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3? If an element is in group 7(or Group 7A) is it likely to be metallic or non-metallic in character?                                                                  [3]

(b) Write short notes on the following types of elements : –

(1) alkali metals                       (2) alkaline earth metals

(3) halogen                              (4) noble gases.                                               [3]

(c) Name or state the following with reference to the elements of the first three periods of the periodic table :                                                                                                      [4]

(1) A metalloid in period 2 and in period 3.

(2) The valency of elements in group IA.

(3) The non-metallic element present in period 3 other than sulphur and chlorine.

(4) An electrovalent compound formed between an alkali metal and a halogen.

(5) A covalent compound formed between an element in period 1 and a halogen.

(6) The bridge elements of period of group IA.

(7) The period which contain the inner transition elements.

(8) The typical element of period 3 which dissolve in water giving a strong alkali.

Q.8.

(a) Describe briefly, with equations, the Bosch Process for the large scale production of hydrogen.                                                                                                                       [4]

(b) Account for the following facts:

(1) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloricacid or dilute sulphuric acid.

(2) Potassium and sodium are not used to react with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.                           [3]

(c) Place the metals calcium, iron, magnesium and sodium in order of their activity with water, placing the most active first. Write the equation for the above metals which react with water.                                                                                                                       [3]

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