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ICSE Class X Mid-term 2025 : Chemistry

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PAWAR PUBLICSCHOOL, DOMBIVALI FIRST PRELIMINARY EXAMINATION 2024-25 SUBJECT: CHEMISTRY MARKS: 80 GRADE:10 TIME:2 HOURS DATE: 26.11.2024 Answers tothis Paper must be written on the separate sheet of paper. You willnot be allowed to write during the first 15 minutes. This time is to be spent in reading the question pape. The time given at the head of this Paper is the time allowed for writing the answers. Section Ais compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets IJ: Ihis paper consists of Five(main) +Four (MC) printed pages. Youare expected to present your paper neatly in legible handwriting. SECTION A(40 Marks) Attempt all questions from this Section) Question 1 Refer to the MCQquestion paper given separately. [15] Question 2 (i) Match the Column A with Column B: [S] ColumnA (a) (b) Element with atomic no. 19 (d) (e) Sodium bisulphite Element with atomic no. 9 Sodium aluminate Calcium fluoride (1) (2) (3) (4) (6) (6) Column B Acid salt Non-metal Metal Amphoteric oxide Baeyer's process Hall Heroult's process (ii) Complete the following by choosing the correct answer from the bracket: (a) Cations are (oxidised reduced) ions due to the (gain/loss) of electrons by the neutral atom. (b) If a hydrocarbon has the formula of CsoHy8, then it is likely to ndergo a/an (addition/ substitution) reaction. [S] (c) Nikita wanted to gift her friend a decorative piece that is quite hard and strong, doesn't get corroded and can be polished. She selected a statue that matched her criteria as it was made of an alloy whose main (CuWAl) constituent was (d) The number of chain isomers possible for an alkane with 5 carbon atoms are (3/4). ..2 2 PPSDLCHIMPE0 (ui) ldentify or name the following: which is basic in nature. radical non-metallic periodic table. State the (0) Name a positive the of I group and 2 period to (b) Element Xbelongs of the element X. chloride mixture. formulaof the given sample Xand heated the rotten to a H,SO, dilute added (C) Anurag liberated which had a foul smell of was gas a that observed He the gas acetate paper silvery black. Name lead moist turned it and eggs evolved in the above case. non two or more metals or a metal or a (d) A homogeneous mixture of state. metal in a definite proportion in their molten electron from a neutral gaseous atom. an remove to cnergyrequired (e) The (V) (a) Draw the structural diagram of the following compounds: [3] 1. Propanoic acid 2. Pentan-2-ol 3. 2,2 dibromocthane [2) (b) Give the IUPACname of the following organic compounds: 1. 2. H H OH H- -# H (v) H HH H H H H-=(-c--c-H H HH H The electron affinity of an element X is greater than that of element Y. [2] (a) How is the oxidising power of X likely to compare with that of Y? (b) How is the electronegativity of X likely to compare with that of Y? (vi) Answer the following questions related to the process of conversion of alumina to aluminium: a (a) Name the constituent of the electrolytic mixture which has (3] divalent metal in it. and anode. (b) Write the reaction that takes place at the cathode SECTION B (40 Marks) (Atempt any four questions from this Section) Question 3 (i) Answer the following questions: A gas is liberated along with (a) Magnesium ribbon is added to dilute HCI. diagram to show the the formation of a compound. Draw an electron dot formed. structure of the compound that is ...3 () A tikent wax aNknt (odhaw the thewhut tu theextractim of eitt tun nt n the uitviey o Motallugy the tlow chart trawn titN lete the stnent ix givem elow xtvyw ut othedo itwwwt lentity ad wite the m t stow ltwtie Sratit (intins (homical mwti 'awinatit Rettning () Ravi heatext 67.5 of ot KCO, i a test tute. The dvositin ptassium chloate took plae woning fo the quation Find gas liberat turing the (Dthe volume ot the colourless atd atourless experiment. in the test tube. (2)the weight of the residue lott tehind using opper elevtrxdes Stuy the (i) Copper sulphate solution isclevtrolyzed and answer the questions which tollow: diagram given below Copex ()'sutyhate solutim oxidizing electrode and whv (a) Which electrode 'A'or 'B is known as the which oveurs at the reaction (b) Write the equation representing the Oxidizing clectrode. electrolysis reaction. (c) State two appropriate observations for the above [5] PPSD WTCHEMFPEI0 Question 4 (i) Give areason for cach of the following statements: point. not consideredan melting high electricitybut (a) lonic compounds have conductor of Copper is a good (b) ionizationpotential. electrolyte. of values high (c) Noble gases have extremely are soft solids. platinumelectrodes, compounds using (d) Certain covalent electrolysed (e) When copper sulphate solution iss the blue colour of solution fades. [5] (1) ldentify the substance marked as 'K' to "P': using 'K' Zinc nitrateammonium to chloride converted (a) Metallic Zinc was and 'L' over (b) Excess ammonia was passed was obtained "M the presence of substance experiment. fountain (C) Sugar turned black in in the fountain red a produced hydroxide. (a) Substance 0' salts with Sodium of types gave two (e) Substance 'P' Question 5 () (ii) for the following reactions: equation chemical balanced Write a marble chips. hydrochloric acid are added tosulphate dilute solution. of drops (a) A few to ferrous added is solution hydroxide (b) Ammonium is heated with carbon. (c) Concentrated nitric acid vitriol crystals. acid is poured over blue (d) Concentrated sulphurichydrochloric acid and copper (l)sulphide. dil. (e) Reaction betweenelectroplated with silver: Ametal Xneedto be made up of? (a) What should be the anode the reaction at the cathode. for (b) Write the ionic equation not used in the a good electrolyte but it is is nitrate silver of solution (c) A justify this statement. above process. Give a reason to (ii) Define the following terms: (a) Atomic radius (b) Ore Question 6 between the following pairs i) Give a chemical test to distinguish [S] [3] [2] of compounds: (21 sulphur dioxide gas (a) Carbon dioxide gas and copper [I]oxide (b) Manganese dioxide and 1000cc and contains X molecules. How many (ii) Gas M occupies a volume of a volume of 250 cc? molecules will be present in gas N occupying [2] ...5 HEMFPEI0 ) .5 Deftine the term -Homologous Series andwrite the condensed formula of hydrocarbon with molecular formula as -C;H, iv) Answer the following questions with respect to the electrolysis of fusedlead (2] [4] bromide: (a) Why is silica crucible used? (b) Graphite electrodes are preferred to platinum electrodes. Provide suitable reason. (c) Write balanced equations for the reactions occurring at both electrodes. Question 7 (i) [2) Draw the isomers of the butyne [21 (i) State one observation in the following cases: (a) Sodium chloride solution is added to a solution of lead nitrate. (b) Catalytic oxidation of ammonia. [3] (ii i) Identify the following substances: when (a) An alkaline gas which produces dense white fumes HCl gas. reacted with the (b) The anion present in the salt, which produces a gas with smell of rotten eggs when reacted with dil. HCI. (c) The particles present in strong electrolytes. information complete (iv) X [2, 8, 7] and Y [2, 8, 2] are two elements.Using this the following: (a) is the metallic element. maximum of (b) Metal atoms tend to have a [3] electrons in the outermost shell. (c) Element Question 8 (i) is the reducing agent. Its molecular weight [3] The empirical formula of an organic compound is C;H4N. compound. Show all the is 108. Find the amount of carbon in one mole of the steps involved. (Atomic weights: C- 12; H- 1; N- 14) Hydronium ion. [2] (ii) Draw the electron dot diagram for the formation of colour. On (iii) Abhishek was given a salt X* for analysis which was white in strong heating it produced a yellow residue, a colourless gas, and also a reddish-brown gas. The solution of the salt X* when tested with excess of ammonium hydroxide produced a gelatinous white insoluble precipitate. (a) Namne the coloured gas evolved when Abhishek heated the salt strongly. (b) Which cation was present in the sample given to Abhishek? (c) Identify the salt given to Abhishek for analysis (iv) Name the alloy which is made up of (b)Lead and tin (a) Copper, zinc and tin ***k (21

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