Time : 2 HoursMaximum Marks : 80 CHEMISTRY

ICSE Sample Question Papers

Self Assessment Paper

General Instructions : 1. Answers to this Paper must be written on the paper provided separately. 2. You will not be allowed to write during the first 15 minutes. 3. This time is to be spent in reading the question paper. 4. The time given at the head of this Paper is the time allowed for writing the answers. 5. Attempt all questions from Section I and any four questions from Section II. 6. The intended marks for questions or parts of questions are given in brackets[].

SECTION I [40 Marks]Answer all Questions from this Section

1. (a) Fill in the blanks with correct options given in brackets. [5](i) Latin name for tin is …….[stannum/stibium](ii) The formulae for bisulphite is…….[HS HSO− −/ 3 ](iii) Lead nitrate solution reacts with potassium iodide solution to give yellow coloured precipitate

of.…….[ PbI PbNO2 3/ ](iv) The photosynthesis reaction is classified as .……. reaction.[Exothermic/Endothermic](v) Nitrogen dioxide turns acidified ferrous sulphate solution…….[Black/Brown]

(b) Choose the correct answers from the options-given below [5](i) An example of solution of solid with another solid is

A. BrassB. Petroleum jellyC. Baking sodaD. Butter

(ii) Properties of eka aluminium matches well with:A. SodiumB. PotassiumC. MagnesiumD. Gallium

(iii) The S.I unit of pressure isA. atmB. PascalC. TorrD. mm Hg

(iv) Nitrogen dioxide is reduced to nitrogen and oxygen in presence of finely divided:A. Calcium

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B. PotassiumC. PlatinumD. Carbon

(v) The pH of sodium hydroxide isA. 1B. 7C. 2.9 D. 13

(c) Name the gas evolved in each of the following cases [5](i) Reaction between iron & water(ii) Heating potassium chlorate in the presence of manganese dioxide(iii) Action of strong heat on potassium nitrate (iv) Addition of dilute sulphuric acid to aluminium(v) Action of heat on ammonium chloride

(d) Give reasons for each of the following: [5](i) Solution of silver nitrate is kept in coloured bottles(ii) Properties of water are different from the properties of its constituent elements(iii) Hydrogen is collected by downward displacement of water(iv) Use of concentrated sulphuric acid as drying agent(v) Argon is used to fill light bulbs

(e) Write your observations: [5](i) When chlorine is passed through the solution of KI (ii) When copper (II) oxide is heated in the presence of reducing agent.(iii) Action of H2 on PbO(iv) Steam is passed over with red hot iron.(v) Ordinary soap is rubbed in beaker containing hard water

(f) (i) The formula of urea is NH CONH2 2 . Calculate the percentage of N in urea [5](ii) Define atomic mass unit(iii) What is the value of 1 atm in torr. Define atmospheric pressure

(g) (i) Write the composition of following: [5]1. Sodium amalgam2. Brass3. Water gas

(ii) Balance the following equations

1. As O SnCl HCl SnCl As H O2 3 2 4 23 6 3 2 3+ + → + +

2. K Cr O HCl KCl CrCl H O Cl2 2 7 3 2 214 2 2 7 3+ → + + + (h) Match the Columns [5]

Column A Column B

(i) Anhydrous substance(ii) Efflorescent substance(iii) Deliquescent substance(iv) Gaseous oxidizing agent(v) Gaseous reducing agent

A. Glauber's saltB. Carbon monoxideC. Ferric chlorideD. NitreE. Chlorine

SECTION II [40 Marks]Answer any four Questions from this Section

2. (i) 1. What is an α (alpha) particle? [3]2. Name the elements represented by symbol. Ag, Hg

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(ii) Give an example of each of the following: [3]1. Electrochemical reaction2. Photochemical reaction3. Exothermic reaction involving carbon as one of the reactant

(iii) Mention the reasons for the following: [4]1. Covalent compounds are non-conductors of electricity2. Covalent compounds are insoluble in water3. Ionic compounds are hard & brittle4. Ionic compounds are good conductor of electricity in molten state

3. (a) State whether the compounds shown in bold letters are oxidised or reduced. Provide reasons also. [3]

(i) PbO CO Pb CO+ → + 2

(ii) H S Cl HCl S2 2 2+ → +

(iii) CuO H Cu H O+ → +2 2 (b) Find the name of metals based on the electronic configuration: [3]

(i) 2, 8, 4(ii) 2, 8, 7(iii) 2,8,8,1

(c) Below are some elements of modern periodic table [4]

4 14 19 20Be F Si, K Ca9, , , (i) Select the element which has one electron in its outermost shell(ii) Select two elements which belong to same group(iii) Select two elements which belong to same period(iv) Identify the element that belong to halogen family

4. (a) Plot the following graphs verifying Boyle’s law [3]

(i) VvsP1

(ii) V vs P(iii) PV vs P

(b) What should be the temperature (in �C ) for a gas with 240 ml volume at 30 �C to occupy one third of its volume? The pressure is kept constant. [3]

(c) Based on the symbols with valencies & charges write the formula of the following compounds [4]

(i) Mg Cl2+ − (Magnesium Chloride)

(ii) K Cr O+ −2 7

2 (Potassium dichromate)

(iii) Na AlO+ −33 (Sodium aluminate)

(iv) Ca N2 3+ − (Calcium nitride) 5. (a) (i) Define electron. [3]

(ii) What is the effect of positive and negative electric field on electrons.(iii) What is magnitude of unit negative charge on electron.

(b) (i) What are isotopes? [3](ii) Which isotopes of C is radioactive?(iii) Which fundamental properties differ in

1. Isobars2. Isotopes.

(c) Write litmus test for: [4]1. Hydrogen

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2. Ammonia3. Carbon dioxide4. Chlorine

6. (a) (i) What is the effect of pressure on the boiling point and freezing point of water [1½] (ii) Show graphically the effect of temperature on the density of water [1½]

(b) (i) 10 gm of sugar is dissolved in 1 kg of water. Calculate the mass % of solution [2](ii) Define mass percent [1]

(c) Write the thermal decomposition reaction of following compounds [4]

(1) Pb OH( )2

(2) Mg CO2 3

(3) Ca HCO( )3 2

(4) KNO3 7. (a) Elements W, X, Y, Z in the periodic table are shown below:-

Group 1 Group 2

Z--

W

-X-Y [6]

(i) State whether Z is metal or non metal(ii) State whether W is smaller or larger than Z in size(iii) State whether Y is smaller or larger than W(iv) Identify what type of anion or cation will be formed by Z and X(v) If Z is the third element of first group, identify the element and what would be the colour

imparted by Z during the flame test (b) State variation in number of shells in [2]

1. Period2. Group

(c) What is the nature of following oxides [2]

1. NO2

2. Bi O2 3

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