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Chemistry Periodic table Question paper

2 pages, 42 questions, 42 questions with responses, 71 total responses,    0    0
Nilanjan Das
St. Xavier's College (SXC), Kolkata
Master of Science Biotechnology
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ICSE Chemistry Test PERIODIC TABLE By Nilanjan Das ( xaveriannilanjan@outlook.com ) F.M. 40 Time: 1 hour ________________________________________________________________________________________ Answers to this paper must be written separately in your test copy. You will NOT be allowed to write during the first 7 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. This question paper is divided into two sections. Section I contains one question with parts (a) to (d); all the four parts are to be answered. Section II contains three questions numbered 2 to 4. You are to answer any two of these questions. The intended marks of questions or for parts of questions are given in brackets [ ]. Section I [Compulsory] [20 marks] Question 1 (a) Choose the most appropriate answer: (i) The element having the highest electron affinity 1. Fluorine 2. Chlorine 3. Bromine (ii) Group IIA elements are known as 1. Alkali metals 2.Alkaline earth metals 3. Halogens (iii) Baring Hydrogen, the other element that attains duplet configuration is 1. Carbon 2. Boron 3. Lithium (iv) If element A has low I.P. and a low electronegativity, it is likely to be a 1. metal 2. Metalloid 3. Non-metal (v) Which of these will have highest number of electron shells? 1. Ar 2. He 3. Ne [5] 4. Iodine 4. Chalcogens 4. Calcium 4. Any of the above 4. Na (b) (i) Name a property of elements that is not periodic. (ii) What is the cause of periodicity? (iii) State the modern periodic law. (iv) How many elements are there in the 1st period? [1+1+2+1] (c) (i) An element A belongs to the third period and Group IA of the periodic table. Find out: (1) number of valence electrons of the element (2) metal or non-metal (3) name of the family of the element (ii) An element has atomic number 15. State its (1) period (2) group in the periodic table. [3] (d) The electronic configuration of an element T is [2,8,7]. (i) What is the group no. of T? (ii) What is the period no. of T? (iii) What is the valency of T? (iv) Is T a metal or a non-metal? (v) State the reaction of T with magnesium (Mg). [5] [2] Section II [20 marks] [Answer any two questions] Question 2 Explain the following observations in the periodic table: (a) Along a period, atomic radius decreases. (b) Noble gases have larger size than their preceding Halogens. (c) Size of an Anion is bigger than the parent atom. (d) Along a group, Electron affinity decreases. (e) Along a group, Ionization potential increases. [5x2] Question 3 (a) A Group of elements in the periodic table is given beside. Answer the questions in relation to the group of elements: [5] (i) Which element has the most metallic character? (ii) Which element would be expected to have the highest electronegativity? (iii) If the electronic configuration of aluminum is [2,8, 3], how many electrons are there in the outer shell of Thallium? (iv) The atomic no. of Boron is 5. Write the chemical formula of the compound formed when Boron reacts with chlorine. (v) Will the elements in the group to the right of this Boron group be more metallic or less metallic in character? Justify your answer. (b) Fill in the blanks using the correct options: In period 3, element B is to the left of element C. (i) The atom of B would be expected to be _____ (larger/smaller) than the atom of C. (ii)Element B would be ____ (more/less) metallic in character than C. (iii) The element with greater Electron Affinity would be _____ (B/C). (c) (i) Why are metals good conductors of electricity? (ii) Arrange in order of increasing electronegativity: Cl, P, Na, Al Question 4 (a) An element Z has atomic number 16. Answer the following questions on Z: i. State the period and group to which Z belongs. ii. Is Z a metal or a non-metal? iii. State the formula between Z and hydrogen iv. What kind of a compound is this? [3] [2] [5] (b) M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following: [5] i. What kind of combination exists between M and O? ii. How many electrons are there in the outermost shell of M? iii. Name the group to which M belongs. iv. State the reaction taking place at the cathode. v. Name the product at the anode.

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