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ICSE Class X Mid-term 2021 : Chemistry

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Kiah Jaiswal
Ryan International School, Asha Nagar, Kandivli East, Mumbai
XI - XII Science

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LOKHANDWALA FOUNDATION SCHOOL TERMINAL EXAMINATION-2020-21 SUBJECT:-CHEMISTRY SCIENCE Paper - 2 Date: 15/10/20 Duration: 2 Hrs. Grade: 10 Max. Marks: 80 __________________________________________________________________________________________ Instructions:-This question paper consists of two sections I & II . Section I is compulsory. Attempt any four questions from section II. The paper consists of 4 pages. ____________________________________________________________________________________________ SECTION I (40 marks) Attempt all questions from this Section Q 1. a. Identify the term used in the following. [5] i. Compounds in which the shared pair of electrons is unequally distributed. ii. The salt formed by partial replacement of a replaceable hydrogen ion of an acid by a basic radical. iii. The tendency of an atom to attract electrons towards itself when combined in a compound. iv. The role of ammonia to convert metallic oxide to metal. v. A base which is soluble in water. b. Use the appropriate word given in the bracket and fill in the blank. [5] i. Metals are good ______ (oxidising agents / reducing agents) because they are electron _______ (acceptors / donors). ii. The H1+ ion is formed by the _____ (loss/gain) of an electron. iii. When sodium chloride reacts with silver nitrate solution, a ______ (milky white/ curdy white) precipitate is formed which is _______ (soluble/insoluble) in excess of ammonium hydroxide. c. Write balanced chemical equation for the following along with conditions if any: i. Hot concentrated nitric acid reacts with carbon. ii. Zinc carbonate reacts with dilute sulphuric acid. iii. Ammonium hydroxide is added to ferric chloride solution. iv. Catalytic oxidation of ammonia. v. Zinc reacts with dilute hydrochloric acid. [5] d. Choose the correct option. i. Concentrated sulphuric acid does not show A. Oxidising property B. Reducing property C. Non- volatile nature D. Dehydrating property ii. Dilute sulphuric acid will produce a white precipitate when added to a solution of A Lead nitrate B. Zinc nitrate C. Copper nitrate D. Sodium nitrate iii. A salt which decrepitates on heating A. NaCl B. CaCl2 C. Pb (NO3)2 D. All of them iv. An acid which as four hydrogen atoms and is monobasic in nature. A. Sulphuric acid B. Formic acid C. Acetic acid D. Phosphoric acid v. A greenish yellow gas which has strong oxidising property. A. Nitrogen dioxide B. Carbon monoxide C. Hydrogen D. Chlorine [5] e. State one relevant observation for the following. i. Sodium hydroxide is added to zinc sulphate in less and then in excess quantity. ii. A pinch of calcium nitrate is heated in a dry test tube. iii. Dilute hydrochloric acid is added to copper sulphide and heated. iv. Ammonia reacts with excess chlorine gas. v. Acidified Iron (II) sulphate solution is added to dilute nitric acid. [5] f. A. Write the formula of: i. Diammine silver chloride ii. Tetrammine copper sulphate B. Draw the electron dot structure of: i. Hydronium ion ii. Nitrogen molecule iii. Methane [2] [3] Grade: 10 Subject: Chemistry Page no: 2 g. Arrange the following according to the instructions given in the brackets: i. Si, S, Mg, Cl (in decreasing order of atomic number) ii. Br, Cl, F, I (in increasing electronegative nature) iii. O, Li, Be, C (in decreasing order of size) [3] h. Write the empirical formula of the compounds whose molecular formulae are as follows: i. N2O4 ii. C2H6 [2] i. a. Find the molecular weight of hydrated zinc sulphate. [ZnSO4.7H2O] [Zn= 65: S= 32; O=16; H=1] b. Find the empirical and molecular formula of an organic compound from the data given below: C= 14.4% ; H= 1.2%; Cl= 84.5%. The vapour density of the compound is 84. [C= 12; H=1; Cl=35.5] [1] [4] SECTION II (40 Marks) Attempt any four questions from this Section Q 2. a. The following questions are related to laboratory preparation of Hydrochloric acid. i. Write the balanced chemical equation for the above preparation. ii. State the method of collection of the gas. iii. In Fountain Experiment, state the colour of the fountain formed using the above gas. iv. State the observation when the above acid is added to lead nitrate solution. [4] b. A group of elements in the Modern Periodic table are given. Answer the following questions related to this group. Lithium, Sodium, Potassium, Rubidium, Caesium i. Write the name of the group. ii. Which is the most metallic element? iii. If the electronic configuration of Potassium is 2,8,8,1 then how many valence electrons is/are there in Rubidium? iv. The element next to Sodium on right hand side will be more or less electropositive? [4] c. The pH values of three solutions P, Q and R are given in the table. Answer the following questions. [2] Solution P Q R pH value 13 2 7 i. State the colour change when methyl orange is added to solution P. ii. State the observation when potassium bisulphite reacts with Q. Q 3. a. Differentiate between the following in columns on the basis of the criteria given in the brackets. i. Sodium chloride and calcium chloride (flame test) ii. Zinc nitrate and copper nitrate (dry heating test) iii. Hydrogen sulphide and sulphur dioxide (acidified potassium permanganate) iv. Ferric sulphate and ferrous sulphate (Caustic soda solution) [4] Grade: 10 Subject: Chemistry Page no: 3 b. A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular formula. [C=12, H=1] [4] c. Name the metal used in the following. i. The metal which reacts with very cold and very dilute nitric acid to evolve hydrogen gas. ii. The metal which forms a reddish brown deliquescent salt on reacting with chlorine gas. [2] Q 4. a. Group Number 2nd period 3rd period 4th period IA 1 Li A R II A 2 Mg T III A IV A 13 14 D E Si I VA 15 Q VI A 16 O G U VII A 17 J M 0 18 Ne Y In the above table few elements are given as elements symbols (in italics) while others are as alphabets. Using the table, answer the following questions. [5] i. In period 3, all the elements will have _____ number of shells. ii. Give reason: J is more electronegative in the second period. iii. State the valency of E and state its atomicity. iv. Write the formula of the compound formed if M combines with Mg. v. Draw the electron dot diagram for the formation of the above compound given in Q 4 a. iv. b. Write balanced reactions along with conditions, if required for the following. i. NH3 + O2 (less) ii. NaHCO3 + HCl (dil.) iii. NaNO3 + H2SO4 (conc.) iv. S + HNO3 (conc.) v. NaOH + NH4Cl [5] Q 5. a. Justify the following using the appropriate terms. i. Helium has the highest ionisation potential. ii. Carbon tertachloride is a non-polar covalent compound. iii. Black substance is formed when few drops of concentrated sulphuric acid is added to glucose. [3] b. Identify the ions when: i. A milky white precipitate is formed, the cation is - __________. ii. A brown ring is formed at the junction of two liquids, the anion is - ______. iii. A reddish brown precipitate is observed on addition of potassium mercuric iodide, the cation is - ____. [3] c. A pinch of ammonium nitrate is heated in a dry test tube. i. Write balanced equation for the above reaction. ii. Find the percentage of nitrogen in ammonium nitrate. (N = 14; O= 16; H=1) iii. Draw the structure of Ammonium marking the lone pair of electrons. [4] Grade: 10 Subject: Chemistry Q 6. a. Define: i. Ionisation potential Page no: 4 ii. Electron affinity [2] b. Industrially Ammonia is prepared by Haber s process. i. Write the balanced chemical equation along with all conditions for the above reaction. ii. Give reason- In Haber s process, initially the reactants are heated and later the heating is stopped. iii. Write the ionic reaction to show the basic nature of ammonia gas on dissolution in water. iv. State the colour of the flame when ammonia is burnt in air. v. Write a reaction when ammonia reacts with hydrogen chloride gas. [5] c. Name the type of particles present. Answer using the words ions /and molecules in the following. i. Dil. HCl ii. NH4OH iii. C2H5OH [3] *******************************************

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