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ICSE Class X Question Bank 2024 : Chemistry

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. .. ..... ltt;i "fU8l.TIOns . Q. l. Complete the following IAtom MJ I . l t lose electron taken by After gaifling electron c:=J Q. 2. ~ m t~e blanks : IForce ofattractio nd f nned isc::::=J ( ent compaunds are soluble in ..... (i) Ionic compounds are soluble in ................ solvents whereas coval .,.... solvents. (ii) .. .............. compounds have definite crystal lattice. (ui) Nitrogen molecule contains a ................ covalent bond. Q 3 Elements A, B and C have atomic number 9, 20 and 10 respectively. (a) State which one is : (i) a non-metal (ii) a metal (iii) chemically inert ,' I (b) Write down the formula of the compound formed by two of the above elements. \..I Q. 4 Give the electron dot and molecular structure of magnesium chlorlde I ' Q. S. Match the atomic number 4, 14, 8, 15 and 19 with each of the following : (i) A solid non-metal of valency 3 (it) A gas of valency 2 (iii) A metal of valency 1 (iv) A non metal of valency 4. Q. 6. Explain the reason: (i) Ionic compounds are solids with high melting points. (ii) Solid ionic compounds do not conduct electricity but their water solution do. Q. 7. An element X has electronic configuration 2, 8, 8, 1. (I) Write the symbol for the ion of X. (ii) State whether the element X is expected to have oxidising or reducing properties. Give reasons. Q. 8. Explain why does not a solution of cane sugar conduct electricity but a solution of sodium chloride is a good conductor. \' Q. 9. (a) Why do certain compounds form covalent bonds ? (b) Give two examples of polar covalent compounds and two examples of non-polar covalent com pounds. Q.10. An element A has four electrons in the outermost shell of its atom and combines with another elements B having seven electrons in the outermost shell. The compound formed does not conduct electricity. (I) What is the nature of the chemical bond in the compound ? (ii) Give the electron dot structure of its molecule. (iii) Give any two properties of this compound. ,

 

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