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ICSE Class X Question Bank 2024 : Chemistry

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Lilavatibai Podar High School . ISC Unit Test 1 - 2024-25 Subject: Grade: Chemistry X Duration: Marks: 1 Hour 40 Instructions: All Questions are compulsory. The intended marks are given next to the questions. The time mentioned above is writing time. Q. 1 i. ii. iii. iv. v. vi. vii. viii. ix. x. xi. xii. Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.) In the 2ndperiod Neon has larger atomic size because: a) It easily accepts electrons. b) penultimate shell is half filled. c) outermost shell is completely filled resulting force of repulsion. d) It easily loses electrons. In the second period, if we move from Li to F , there is a regular decrease in: a) Atomic radius b) Atomic number c)electronegativity d) ionization potential. Which of the following remains unchanged on descending a group in the modern periodic table? a) metallic character b) Ionization potential c) atomic number d) valence electrons. An element in Period 3, whose electron affinity is zero: a) sulphur b) Neon c) Argon d) sodium. If the element has a low ionisation energy, then it is likely to be: a) metallic b) non-metallic c) electronegative d) both b & c. The element with highest ionisation potential is: a) Caesium b) Helium c) Hydrogen d) Radon. Which one of the following compounds neither dissociate nor ionise in water? a) Sodium hydroxide b) Potassium nitrate c)Hydrochloric acid d) Carbon tetrachloride. Which one of the following has only one set of lone pair of electrons? a) Ammonia b) water c) methane d) Magnesium oxide. Which combination of atoms can form a polar covalent bond? a) Na & Br. b) oxygen & oxygen c)Nitrogen & Nitrogen d) Hydrogen & chlorine. Which one of the following configurations represents the most metallic element? a)2,8,7 b)2,8,2 c)2,8,4 d)2,8,1. Molten sodium chloride conducts electricity due to the presence of: a) free molecules b) free electrons c) free ions d) free ions & molecules. The metallic hydroxide soluble in excess of sodium hydroxide is: b) Zn (OH)2 c) Ca (OH)2 d) both a & b. a) Pb (OH)2 This paper consists of 3 printed pages [15] Page 1 of 3 xiii. xiv. xv. Q2a Copper (II)sulphate solution dissolves in excess of NH4OH, forms a deep blue solution. It is due to the formation of: a) Tri amine copper sulphate b) Tetra amine ammonium sulphate c)Tetra amine copper hydroxide d) Tetra amine copper sulphate. Sodium zincate and water is obtained on reaction of --------- with hot concentrated caustic soda: a) Lead b) sodium c) zinc d) zinc hydroxide. The gas evolved on reaction of Aluminium with boiling concentrated KOH is: a) Oxygen b) Hydrogen c) carbon dioxide d) Nitrogen. Give reasons for the following. [3] i. Ionic compounds have high melting point and high boiling point. ii. Carbon tetra chloride does not conduct electricity. iii. Methane is soluble in benzene but insoluble in water. 2b. State the terms for the following. The amount of energy released when an atom in the gaseous state accepts an electron to form an anion. The covalent compounds in which the electrons are shared equally between the combining atoms. Arrange the following as per instructions given in brackets: i. ii. Q3a [2] [3] i. Na, K, Cl, S, Si. (Increasing Ionisation potential) ii. F, Be, N, C, O. (Decreasing order of atomic size) iii. Cl, Br, F, I. (Decreasing electronegativity) 3b. Write balanced chemical equations for the following: [2] Reaction of Lead (II) oxide with hot concentrated solution of sodium hydroxide. Copper (II)sulphate solution reacts with Ammonium hydroxide to form a precipitate. This question refers to the elements of the Periodic Table with atomic numbers from 1 to 20. The elements are shown by letters which are not the usual symbols of the elements. [3] i. ii. Q4a 1 2 3 4 5 A B 6 7 8 C 9 10 11 12 D E F 13 14 G 15 16 17 18 H I 19 20 J i. List the alkali metals from the above table. ii. Which is more metallic B or J? iii. Name the elements those belong to same period having two shells. State one chemical test that would enable you to distinguish between the following pairs of chemicals. Calcium nitrate solution & zinc nitrate solution. (By adding ammonium hydroxide solution) 4b. i. ii. Q5a Lead salt solution & Fe (II) salt solution. (By adding sodium hydroxide solution) Draw electron dot diagram to show the formation of following: i. Hydronium ion. ii. Molecule of water. Magnesium chloride. [Atomic no. of Hydrogen = 1, Oxygen = 8, Magnesim = 12, Chlorine = 17] iii. [2] [3] Page 2 of 3 5b. Define the following. Q6a i.Electronegativity ii. Covalent bond. Study the formation of Ammonium ion and answer the following questions. [2] [3] i. State the number of single covalent bond/bonds in Ammonium ion. ii. A hydrogen ion needs ----- electron/electrons to complete its duplet. iii. State the type of bond formed between ammonia and the hydrogen ion. 6b. With reference to period 3 of the periodic table-State: [2] i. The number of electrons in the penultimate shell of the element with valency, -1. ii. The electronic configuration of the element whose hydroxide is an alkali. iii. In case the blank will not come properly so changed into statement based. ------------------------------------------------------------------------------------------------------------------------- Page 3 of 3

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