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ICSE Class X Mid-term 2026 : Chemistry

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Calcutta Public School Half Yearly Examination 2026-27 Chemistry Class X Time: 2 hours Marks: 80 __________________________________________________________________________ Attempt all questions from Section A and any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ] Section A(40 Marks) Question 1: Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answers only) i) Which of the following statement is not true for group number I elements? a) Good conductors of heat b) Good conductors of electricity c) Strong reducing agents d) Form covalent compounds with non metals ii) Choose the correct order among the following in terms of atomic radii: a) C>N>O b) C<N<O c) B>C<N d) O>F>Ne iii) Assertion(A): Calcium oxide is an electrovalent compound. Reason(R): Magnesium chloride is a covalent compound. a) Both A and R are true and R is the correct explanation of A b) Both A and R are true and R is not the correct explanation of A c) A is true but R is false d) A is false but R is true iv) Choose the correct set with reference to water molecule: a) 2 lone pair & 2 covalent bond b) 1 lone pair & 2 covalent bond c) 2 lone pair & 2 ionic bond d) 1 lone pair & 2 ionic bond v) If acid is added to an aqueous medium then [H +] ion concentration a) increases b) decreases c) remains same d) First decrease then increase vi) Assertion(A): Acidic oxide on reaction with water forms acid. Reason(R): Potassium oxide is an acidic oxide. a) Both A and R are true and R is the correct explanation of A b) Both A and R are true and R is not the correct explanation of A c) A is true but R is false d) A is false but R is true vii) Which of the following aqueous solution of salt does not react with NH4OH? a) CuSO4 b) FeCl3 c) NH4Cl d) ZnSO4 viii) Solid sodium chloride is a a) Non electrolyte b) Weak electrolyte c) Strong electrolyte d) None of these ix) The statements below show the results when three metal strips P, Q and R are placed in blue copper sulphate solution. P Q R RRR x) CuSO4 P- Solution turns green Q- Solution becomes colourless R- Solution remains blue Which of the following metals could be P,Q and R? a) P-Al, Q-Zn, R-Fe b) P-Zn, Q-Fe, R-Ag c) P-Fe, Q-Zn, R-Ag d) P-Zn, Q-Al, R-Fe Assertion (A): Pure distilled water conducts electricity. Reason (R): Formic acid is a strong electrolyte. a) Both A and R are true and R is the correct explanation of A b) Both A and R are true and R is not the correct explanation of A 1 [15] c) A is true but R is false d) Both A and R are false xi) 10g of magnesium carbonate reacts completely with excess dilute hydrochloric acid. What volume of carbon di oxide is formed at room temperature and pressure? [Mg=24, C=12, O=16] The equation for the reaction is MgCO3 + 2HCl MgCl2 + H2O + CO2 a) 2.8 dm 3 b) 2.6 dm 3 c) 2.2 dm 3 d) 2.4 dm 3 xii) The main base metal in amalgam is a) Hg b) He c)Li d)Al xiii) Concentration of the ore includes a) Froth floatation method b) Magnetic separation c) Roasting d) both a & b xiv) Which gas is liberated when sulphide reacts with dil. H2SO4? a) SO2 b) H2S c) SO3 d) CO2 xv) Choose the correct set of products formed when sodium chloride reacts with conc. H2SO4. below 200 C a) NaHSO4, HNO3 b) Na2SO4, HCl c) NaHSO4, HCl d) Na2SO4, HNO3 Question 2 i) The given diagram represents the electroplating of an article with nickel. [5] a) b) c) d) Write down the chemical formula of the electrolyte used here. Give the cathode reaction for the above process. Why is the anode replaced periodically? Mention the type of reaction taking at anode. Give one reason for electroplating. ii) Match the column A with column B Column A a) Acidic oxide b) Basic oxide c) Sodium sulphate d) Neutral oxide e) Lead chloride iii) a) b) c) d) e) iv) [5] Column B i) Neutralization ii) Non metallic oxides iii) Non metallic oxides that do not react with both acids and bases iv) Precipitation v) Metallic oxide Identify the following: [5] A bond formed by sharing a pair of electrons, with both electrons being provided by the same atom. The energy required to remove an electron from a neutral gaseous atom. A salt formed by the complete neutralization of an acid by a base. The tower in which catalytic oxidation of SO 2 to SO3 takes place during manufacture of sulphuric acid. The number of electron pairs which an atom shares with one or more atoms of same or different kind to achieve stable electronic configuration. Complete the following by choosing the correct answers from the bracket. 2 [5] a) b) c) d) e) Catalytic oxidation of SO 2 to SO3 is an ________(exothermic/endothermic) reaction. __________ (HCl/H2SO4) does not form an acid salt. Non polar covalent compound is ______ ( H2O/Cl2). Element which has more number of shell is _____. (Na/K) 22.4 l of any gas at s.t.p. is equal to (100g/1g) molecular weight of gas. v) a) Calculate the number of moles, total number of molecules , the number of H atoms in 294 g of sulphuric acid. [H=1, S=32, O=16] b) Draw the structure of hydronium ion. Section B (40 Marks) [Attempt any four questions from this section] Question 3 i) Two elements A and P have atomic no. 16 and 18 respectively. Answer the following questions based on the statement given. a) To which period does A belong? b) How many valence electrons are there in P? c) If element A gains 2 electrons what is the process known as? ii) With respect to Calcium oxide answer the following a) Give the oxidation reaction of calcium atom. b) Draw the electron dot structure of calcium oxide formation. iii) Arrange the elements as per instructions. a) Ne, F, O, B, C (Increasing order of valency) b) P,S, Cl, Si (Decreasing order of electronegativity) iv) Mr. Vijay has a compound with formula H 2P. H represents hydrogen and P represents a non metal. a) State the type of bonding in H2P. b) Draw the electron dot structure for the same Question 4 i) A gas jar filled with hydrogen gas can hold 500 g of the gas. In the same gas jar 2000g of gas P and 5000g of gas Q can be filled. If all the conditions of temperature and pressure in cylinder are kept constant, calculate the relative molecular masses i.e. molecular weight of gas P and Q. ii) A is a deliquescent substance/salt which has the cation Fe3+. When A treated with sodium hydroxide it gives B and C as product. C is reddish brown precipitate. a) What is A? b) Give the chemical formula of B and C. c) What do you observe when excess of NaOH added to C? d) Give balanced reaction when A is treated with NH4OH. iii) What property of sulphuric acid is exhibited in each of the following cases? a) In the preparation of HCl gas when it reacts with sodium chloride. b) When conc. H2SO4 reacts with copper to produce sulphur dioxide gas. Question 5 i) Pratik heated 11.2 g of element M (at. wt. 56) with 4.8g of element N (at. wt. 16) : to form a compound. Find the empirical formula of the compound by Pratik. ii) Give the balanced chemical equation for the following: a) Burning of iron pyrites. b) Ethanol on reaction with conc. H2SO4. c) Potassium bicarbonate and sulphuric acid d) Copper and conc. Sulphuric acid iii a) What is an ore? Name two ores of iron. b) Name any alloy which consists of Ni, C and Fe. Give reaction when iron (III) oxide is treated with reducing agent carbon monoxide. Question 6 i) Ammonia is a key chemical building block used to manufacture urea industrially. Urea is one of the important fertilizer used by farmers. Based on this information answer the following: a) Which type of compound is ammonia? b) State the no. of lone pair in ammonia and ammonium ion. 3 [3] [2] [3] [3] [2] [2] [3] [5] [2] [2] [4] [2] [2] [3] ii) a) b) c) d) iii) Considering the electrorefining of metal copper answer the following: What is the electrolyte used in the above the process? Give the reaction at anode. Name two other metals refined by electrolysis. What is the nature of anode used in this process? State the difference between copper and copper sulphate (aq.) in terms of flow of electricity and conductors of electricity (state). [5] [2] Question 7 i) Distinguish between dil. HCl and dil. H2SO4 using lead nitrate. Comment on solubility of the product in hot water also. [2] ii) Copper reacts with dilute nitric acid to give copper nitrate, water and nitric oxide. Calculate a) Mass of copper needed to react with 126g, of HNO 3. b) Volume of nitric oxide obtained at the same time. (Cu=64, H=1, O=16, N=14) 3Cu + 8HNO3 3Cu(NO3)2 + 4H2O + 2NO [4] iii) Rohit has solution X,Y and Z that has pH 2,7 and 13 respectively. [4] a) Which solution will liberate SO 2 gas when heated with sodium sulphite? b) Which solution will liberate ammonia gas when reacted with ammonium chloride? c) Which solution will have no effect on litmus paper? d) What type of indicator is pH paper? Question 8 i) Define the terms: a) Electron affinity b) Ionisation potential ii) What is roasting and calcination? Mention the type of ore where it is performed. iii) Name the major metal present in the alloys: a) bell metal b) solder c) stainless steel iv) The diagram shows electrolysis of molten lead bromide. With reference to it answer the following: a) b) c) Why is the crucible of electrolytic cell made of silica? What is the cathode and anode made up of? Give the reaction at cathode. 4 [2] [2] [3] [3]

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