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ICSE Prelims 2013 : Mathematics (St. Dominic's School, Bangalore)

4 pages, 61 questions, 40 questions with responses, 44 total responses,

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ST. DOMINIC S SCHOOL CLASS Marks X CHEMISTRY 80 Question 1: (a) Correct the following statements supplying the missing words : 6x1 =6 i] The electrolysis of lead bromide liberates lead and bromine. ii] Copper sulphate crystals are dehydrated bt sulphuric acid. iii] Metals of IA group are called alkaline earth metals. iv]Blue litmus paper turns red with dry HCl gas. (b) What is atomicity? State one element with atomicity eight. (c) i] Which compound should be treated with soda-lime to obtain methane gas . Ii]Give a test to distinguish between ethane and ethyne. (d) give one difference between the following: i] Ionisation and electrolytic dissociation. ii] Ionisation potential and electron affinity. Iii] Polar and non polar molecule. Iv] Normal elements and transition elements. v] Saturated hydrocarbons and unsaturated hydrocarbons. (e) you are provided with the following substances. A. Lead chloride B. Zinc SulphideC. Sodium Carbonate D. Lead Nitrate E. Ammonium carbonate F. Calcium chloride G. Calcium sulphide H. Zinc carbonate I. Silver nitrate. Choose one substance in each case which matches the description below: I] A normal salt formed when basic oxide and acidic oxide react. Ii] An insoluble binary salt. Iii] An insoluble carbonate. Iv] An insoluble salt formed from two soluble salts. V] A salt which on heating leaves metal as residue. (f) If a crop of wheat removes 30kg of nitrogen per hectare of soil, what mass of the fertilizer calcium nitrate would be required to replace the nitrogen of a 5-hectare field ? (g) A gas sample occupies 4 liters at 270 C and P atmospheric pressure. What would be its volume at 3270 C and 2P atmospheric pressure? SECTION II (40 MARKS) Attempt any four questions from this section. Question 2 a) An electric cell is set up using two platinum electrodes and acidulated water. I] Draw and label the diagram of electrolytic cell. Ii] Name the ions present in the cell. Iii] Name the ions migrating towards anode. Iv] Name the ions migrating towards cathode. V] Name the ions which will not be discharged at electrodes during electrolysis. Vi] Write the reaction of cathode. Vii] write the reaction of anode. b) Choose appropriate words from the following list and fill in the blanks (i) to (vi) below : c) Anions, anode, cathode , cations, electrode, nickel, voltameter, dilute sulphuric acid. To electroplate an article with nickel requires an (i) ___________ which must be a solution containing (ii) ____________ ions and small amount of (iii) ___________ The article to be plated is placed at the (iv) ____________ of the cell in which the plating is carried out. The (v) __________ of the cell is made from pure nickel. The ions that are attracted to the negative electrode and discharged are called (vi) ___________ Question 3 a) Write balanced equation for the following : I] Ethane from sodium propionate, Ii] Ethyne from calcium carbide, Iii] sulpher reacts with nitric acid. Iv] Ethene from ethanol. V] Ethanoic acid from ethane, Vi] Ethanol from ethylene. b) Find the odd one out : [4] I] A. Sodium carbonate B. Sodium bicarbonate C. Sodium chloride D. Sodium Acetate Ii] A. NH4CL B. NaCl C. (CH3COO)2Pb D.Na2CO3 Iii] A. C2H4 B. C2H2 C. C2H6 D. C4H8 Iv] A. MgO B. CuO C. Al2O3 D. Fe2O3 Question 4 a) Manganese (IV) oxide, lead (IV) oxide and red lead (Pb3O4) react with concentrated hydrochloric acid liberating a gas. I] What is the common property being shown by these metal oxides ? Ii] Write the equation for the reaction of concentrated hydrochloric acid with Pb3O4 Iii] What compound can be added to bleaching powder to obtain chlorine ? b) I] What compound should be heated with soda lime to obtain ethane gas in the laboratory ? Ii] Write the equation for the reaction in (1) above. Iii] Write balanced equation for the complete combustion of ethane. Iv] Name a solid which can be used instead of concentrated sulphuric acid to prepare ethylene by dehydration of ethanol. V] name a reagent which can be used to distinguish between ethane and ethane. Vi] Ethylene forms an addition product with bromine. Name this addition product and write its structural formula. Question 5 a) Water can be split into hydrogen and oxygen under suitable conditions. The equation representing the change is : 2H2O(1) 2H2(g) + O2 (g) (i) If an experiment results in 2500 cm3 of hydrogen being produced, what volume of oxygen is liberated at the same time under the same conditions of temperature and pressure ? (ii) This 2500 cm3 of hydrogen is subjected to 2 1/2 times increase in pressure ( temperature remaining constant). What volume will hydrogen now occupy ? b) Find the empirical and molecular formula of an acid of phosphorous which has 38.27 % of phosphorous and 59.26% of oxygen. The relative molecular mass is 162. Write an equation for the preparation of this acid. (H = 1 ; O = 16 ; P = 31). [5] Question 6 a) Name two main ores of aluminium from which it is extracted by electrolysis. [2] b) Write the three main reactions of purification of alumina.[3] c) Give the main equation of electrolytic reduction of aluminium. [1] d) What is alumino thermit ? [1] Question 7 a) You are provided with the following chemicals : [3] NaOH , HCL , Fe , Zn , Na2CO3 , CL2 . Zn(OH)2 , CO2 , H2SO4 . [3] Using the suitable chemicals from the given list only , write equations to prepare : (i) Iron (III) chloride, (ii) Sodium sulphite (iii) Sodium zincate b) M is an element in the form of a powder. M burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences : [3] (i) If M is a metal , then litmus will turn ___________ (ii) If M is non metal , then the litmus will turn ____________ (iii) If M is a reactive metal , then ___________ will be evolved when M reacts with dilute sulphuric acid. c) Write balanced equation for the preparation of the following : [4] Question 1: Question 1: Question 1: Question 1: Question 1:

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