
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

ICSE Class X Mid-term 2025 : Chemistry

14 pages, 121 questions, 5 questions with responses, 5 total responses,

Dr. Anita Gupta
Sarala Birla Academy (SBA), Bangalore

+Fave Message

Profile Timeline Uploads

Home > anitagupta26 >

Formatting page ...

SARALA BIRLA ACADEMY- BANGALORE HALF YEARLY EXAMINATIONS 2024 2025 CHEMISTRY (Two Hours) Grade X Maximum Marks 80 Friday, 30/08/2024 _____________________________________________________________________ __________________________________________________________________ SECTION A (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answers only.) (i) [15] Which metal does not react with HCl to form a colourless, odourless gas which burns with a pop sound? (a) (b) (c) (d) Ca Mg Cu Zn __________________________________________________________________________ This paper consists of 12 printed pages SBA/HY/X/CHEM/2024 Turn over 1 (ii) The below diagram represents the electrolysis of acidified water. The reaction occurring at the anode is: (iii) With referenec to the portion of the periodic table given below, identify the element having the largest atomic size: (a) (b) (c) (d) (iv) Li B K L Assertion (A): Dry hydrogen chloride gas is collected by the upward displacement of air. Reason (R): Hydrogen chloride gas is lighter than air. (a) (b) (c) (d) Both A and R are true and R is the correct explanation of A Both A and R are true and R is not the correct explanation of A A is true but R is false A is false but R is true ___________________________________________________________________________________________ SBA/HY/X/CHEM/2024 2 (v) 2 1H is (a) (b) (c) (d) (vi) Be placed before hydrogen Be placed after hydrogen Be placed at the same position as hydrogen Not have any position as hydrogen Which element forms a stable ion with the same electronic configuration as argon? (a) (b) (c) (d) (vii) an isotope of hydrogen. In the modern Periodic Table, it will: Magnesium Fluorine Chlorine Sodium Ramu makes a detailed study on the values of electronegativity and the formation of compounds. Accordingly, he draws the following conclusion: The larger the electronegativity (EN) difference between the combining atoms, the more ionic bonds will form. If the EN difference is negligible, covalent bonds will form. So, which of the following values refers to covalent bonds? P: 3.0 and 3.0 Q: 0.9 and 3.0 (a) (b) (c) (d) Only P Only Q Both P and Q Neither P nor Q (viii) An aqueous solution of copper sulphate turns colourless on electrolysis. Which of the following could be the electrodes? P. anode: copper; cathode; copper Q. anode: platinum; cathode; copper R. anode: copper; cathode; platinum (a) (b) (c) (d) Only P Only Q Only R Both Q and R _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 Turn over 3 (ix) He electronic configuration of X is 2,8,6. It gains Y electrons into its valence shell to attain the nearest noble gas electronic configuration and gets converted to an ion Z. X, Y, and Z, respectively, are: (a) (b) (c) (d) (x) Which of the following arrangements is INCORRECT as per the property stated against it? (a) (b) (c) (d) (xi) Sodium, one, electropositive Beryllium, two, electronegative Oxygen, six, electronegative Sulphur, two, electronegative Li > Be > N > O (Metallic character) Cl > F > Br > I (Electron gain enthalpy) O2- > F > Mg2+ > Na+ (Ionic radii) I > Br > Cl > F (Number of shells) Assertion (A): Few drops of dilute acid is added to a solution of zinc sulphide, a colourless gas is formed with a rotten egg odour. Reason (R): Gas formed does not turn moist lead acetate paper silvery black. (a) (b) (c) (d) (xii) Both A and R are true A and R are true, but R is the correct explanation of A A is true, but R is not the correct explanation of A. Both A and R are false. Element P has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of P is: (a) (b) (c) (d) 2 1 3 4 (xiii) With excess of chlorine, NH3 forms: (a) (b) (c) (d) NH4Cl NCl3 NOCl N2Cl _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 4 (xiv) The acid used in the reaction shown by the given picture is: (a) (b) (c) (d) (xv) Concetrated H2SO4 Acetic acid Dilute H2SO4 Citric acid The atomic radius of the elements decreases across period 3. Which of the following statemnets explain(s) this phenonmenon? P. Electron shells are added across period 3 which increases the nuclear force of attraction. Q. The nuclear charge increases across period 3 due to increases in atomic number. R. There is a greater force of attraction between the nucleus and the electrons. (a) (b) (c) (d) Both P and Q P, Q and R Both P and R P only Question 2 (i) Electroplating steel objects with silver involves a three-step process. [5] Step 1 A coating of copper is applied to the object. Step 2 A coating of nickel is applied to the object. Step 3 The coating of silver is applied to the object. (a) A diagram of the apparatus used for step 1 is shown. _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 Turn over 5 1. The chemical process taking place on the surface of the object is Cu2+ (aq) + 2e- Cu(s) What is the observation seen on the surface of the object? 2. Explain why the concentration of copper ions in the electrolyte remains constant throughout step 1. (b) Give two changes which would be needed in order to coat nickel onto the object in step 2. (c) Write down the reaction taking place at the positive electrode during step 3. (ii) (iii) Match the following Column A with Column B. [5] Column A (a) Sulphuric acid Column B 1. Coating of a metal on cathode (b) Electroplating 2. Contact process (c) Carbon tetrachloride 3.K, Na, Li, Rb (d) Complete shell 4. Covalent compound (e) Alkali metals 5. Noble gas Complete the following by choosing the correct answers from the bracket. [5] (a) The ____________ [higher/ lower] is the position of the cation in the electrochemical series, the greater the difficulty of it being discharged at the cathode. (b) The amount of energy involved in the reaction X + Energy X+ + e- is known as the __________ [electron affinity/ ionization potential] of the element X. (c) Atoms of same element combine to form molecules by means of _________ [covalent/ ionic] bonds. (d) The reaction taking place in the Haber process is ________ [exothermic/ endothermic] (e) The oxidized product obtained on reaction with H2S gas and dil. HNO3 is _________ [ammonia/ Sulphur] (iv) Identify the following: [5] (a) An experiment which demonstrates the extreme solubility of ammonia. (b) The gas which turns acidified potassium dichromate clear green. _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 6 (c) A positive charge present in the nucleus of an atom which is equal to the number of protons in the nucleus. (d) A bond formed by a shared pair of electrons with both electrons coming from the same atom. (e) The process by which a particle gains or loses electron. (v) Draw the electron dot diagram of the following: [5] (a) Ammonium ion, NH4+ (b) Carbon tetrachloride, CCl4 (c) Sodium chloride, NaCl SECTION B (40 Marks) (Attempt any four questions.) Question 3 (i) Identify the reactant and write the balanced equation for the following: [2] Nitric acid reacts with compound Q to give a salt Ca(NO3)2, water and carbon dioxide. (ii) What property of Sulphuric acid is exhibited in each of the following cases: [2] (a) In the preparation of HCl gas when it reacts with Sodium chloride. (b) When concentrated Sulphuric acid reacts with Copper to produce Sulphur dioxide gas. (iii) Arrange the following as per the instruction given in the brackets: [3] (a) Al, K, Mg, Ca (decreasing order of its reactivity) (b) N, Be, O, C (decreasing order of non- metallic character) (c) P, Si, f, Be (decreasing order of valence electrons) _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 Turn over 7 (iv) Give balanced equations for each of the following: [3] (a) Action of warm water on Aluminium nitride. (b) Oxidation of carbon with conc. Nitric acid. (c) Passing dry ammonia gas over heated lead oxide placed in a combustion tube to produce a silvery grey metal. Question 4 (i) Ionisation energies of 4 elements A, B, C and D are 496, 403, 520 and 419 KJ/mol, respectively. If these elements belong to the same group in the Periodic Table, which element will occupy the top position in the group? Justify your answer. [2] (ii) Ammonia gas is passed into water as shown below: [2] (a) When a red litmus paper was dropped into the resulting solution, it turned blue. Which ions in the solution would have resulted for the colour change in the litmus paper? (b) Why is the funnel kept in an inverted position? (iii) Given below in column A is a schematic diagram of the electrolytic reduction of alumina. Identify the parts labelled as A, B and C with the correct options from the Column B. [3] _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 8 (iv) X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information complete the following: (a) ___________ is the metallic element. [3] (b) Metal atoms tend to have a maximum of ____________ electrons in the outermost shell. (c) __________is the reducing agent. Question 5 (i) Element X forms an oxide with the formula X2O3 which is a solid with high melting point. X would most likely be placed in the group of the Periodic Table as: 1. (a) Na (b) Mg (c) Al [2] (d) Si 2. Justify your answer in the above question (1). (ii) (a) Ranjana wants to prove that ammonia is a reducing agent. To demonstrate this, she passes, ammonia gas over heated copper oxide. What will she observe? [2] (b)Write a balanced chemical equation for the above reaction. (iii) Copper sulphate solution is electrolyzed using copper electrodes. [3] (a) Which electrode [cathode or anode] is the oxidizing electrode? Why? (b) Write the equation for the reaction occurring at the above electrode. (iv) Rohan wants to electroplate a spoon with nickel. [3] (a) To which electrode should he connect the article to be electroplated? (b) Write the equation for the reaction that will occur at the cathode. (c) What should the anode be made up of? Question 6 (i) PQ2 is a hard crystalline solid having high melting and boiling points. It is a good conductor of electricity in both molten and aqueous forms. [2] _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 Turn over 9 (a) The conductivity of PQ2 is due to the presence of free__________. [ions, molecules, electrons] (b) During electrolysis of aqueous PQ2, if thickening of the cathode and thinning of the anode is observed, the anode material will be ____________. [graphite, application] (ii) Magnesium ribbon is added to dilute HCl. A gas is liberated along with the formation of a compound. Draw an electron dot diagram to show the structure of the compound that is formed. (iii) [2] Study the information given in the table below and answer the questions that follow. (Note- the letters do not represent the actual symbols of the elements) Element X Y Z Electronic configuration 2,2 2,8,2 2,8,8,2 [3] Ionization energy kjmol-1 900 738 590 (a) Explain why element X has highest ionisation energy. (b) To which period does Z belong? (c) Draw the electron dot structure of the compound formed between Z and oxygen. (iv) The diagram given below is representation of the Industrial preparation of Nitric acid by Ostwald s process. With respect to the process answer the following questions: [3] (a) Write the temperature and the catalyst required during the catalytic oxidation of ammonia. _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 10 (b) Give balanaced chemical equation for the reaction occuring during the conversion of nitrogen dioxide to nitric oxide. Question 7 (i) Give balanced equation for the following: [2] (a) Laboratory preparation of ammonia. (b) Laboratory preparation of Hydrogen Chloride Gas. (ii) Elements- W, X, Y, and Z have electronic configuration W= 2, 8, 1 ; X = 2, 8, 7 Y = 2, 5 ; Z = 1 [2] (a) What type of bond is formed between W and X. (b) What is the formula of the compound formed between X and Z (ii) Some bacteria obtain their energy by oxidizing Sulphur, producing sulphuric acid as a byproduct. In the laboratory, or industrially, the first step in the conversion of sulpur to sulphuric acid is to produce Sulphur dioxide. Than Sulphur dioxide is converted to Sulphur trioxide which reacts with water, producing sulphuric acid. [3] (a) Name one catalyst used industrially which speed up the conversion of Sulphur dioxide to sulphur trioxide. (b) Write the balanced equation for the conversion of sulphur dioxide to Sulphur trioxide. (c) What is the name of the compound formed between Sulphur trioxide and sulphuric acid? (ii) Name the particles present in: [3] (a) Strong electrolyte (b) Non- electrolyte (c) Weak electrolyte _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 Turn over 11 Question 8 (i) Give reasons for the following: [2] (a) Hydrogen chloride gas cannot be dried over quick lime. (b) Direct absorption of hydrogen chloride gas in water in not feasible. (ii) Identify the gas evolved when: [2] (a) Potassium sulphite is treated with dilute hydrochloric acid. (b) Concentrated hydrochloric acid is made to react with manganese dioxide. (iii) Choose the correct word which refers to the process of electrolysis from A to E, to match the description (i) to (iii) A: Oxidation B: Cathode D: An electrolyte [3] C: Anode E: Reduction (i) Conducts electricity in aqueous or in molten state. (ii) Electrode connected to the positive end or terminal of the battery. (iii) A reducing electrode. (iv) Write the balanced chemical equation to show: [3] (a) Oxidising action of conc. Sulphuric acid on carbon. (b) The behavior of H2SO4 as an acid when it reacts with magnesium. (c) The dehydrating property of conc. Sulphuric acid with hydrated CuSO4. _____________________________________________________________________________________________ SBA/HY/X/CHEM/2024 Last page 12 13 14

Formatting page ...

Top Contributors
to this ResPaper
(answers/comments)

Dr. Anita Gupta
(5)

Formatting page ...

anitagupta26 chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: