Question:1) What happens when an aqueous solution of sodium sulphate reacts within aqueous solution of barium chloride? State the Physical conditions of the reactants in which the reaction between them will to take place. Write the balanced chemical equation for the reaction and name the type of reaction.
Question:2) No chemical reaction takes place when granules of a solid A, are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes between its components. One of the products, C is metal and settles down in the molten state while the other product D, floats over it. It was observed that the reaction is highly exothermic.
(i) Based on the given information make an assumption about A and B and write a chemical equation for the reaction indicating the conditions of reaction. Physical state of the reactants and products and thermal status of the reaction.
(ii) Mention any two types of reactions under which above chemical reaction can be classified.
Question:3) Atoms of the eight elements A,B,C,D,E,F,G and H have the same number of electronic shells but different number of electrons in their outermost shell. It was found that elements A and G
Combine to form an ionic compound. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral. Based on the above information answer the following questions:
(a) To which group or period of the periodic table do the listed elements below?
(b) What would be the nature of compound formed by a combination of elements B and F.
(c) Which two of these elements could definitely be metals?
(d) Which one of the eight elements is most likely to be found in gaseous state at room temperature?
(e) If the number of electrons in the outermost shell of elements C and G are 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.
Question:4) Write the names and symbols of two most reactive metals belonging to group I of the periodic table. Explain by drawing electronic structure how either one of the two metals reacts with a halogen. By what name is the bond formed between these elements known as and what is the class of the compound so formed named as? State any four physical properties of the compounds.
Question:5) (i) How do you calculate the possible valency of an element from the electronic configuration of its atoms?
(ii) Calculate the valency of element X whose atomic number is 9.
Question:6) On the basis of electronic configuration, how will you identify the first and last element of a period?
Question:7) Out of HCL and CH3COOH, which one is weak acid and why? Describe an activity to support your answer.
Question:8) Two elements X and Y belong to group 1 and 2 respectively in the same period of the periodic table. Compare them with respect to:
(i) The number of valence electrons in their atoms.
(ii) Their valencies
(iii) Metallic character
(iv) The size of their atoms.
(v) The formulae of their oxides.
(vi) The formulae of their chlorides
Question:9)(i) Write electron dot structure for Magnesium and oxygen?
(ii) Show the formation of MgO by transfer of electrons.
(iii) What are the ions present in this compound?
Question:10) (i) Why does micelle formation takes place when soap is added to water? Will a micelle be formed in other solvents like ethanol also?
(ii) What is the importance of common salt in the preparation of soap.
(iii) Write an equation for the chemical reaction involved in the formation of ester?
Question:11) (a) An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table:
(i) What is the number of valence electrons in X?
(ii) What is the number of valence electrons in Y?
(iii) What is the valency of X and Y?
(b) Why could no fixed position be given to hydrogen in Mendeleev’s periodic table.
Question:12).a)Explain why a salt which does not conduct electricity in the solid state becomes a good conductor in molten state.
b)How are metals refined by the elctrolytic process? Describe the electrolytic refining of copper with the help of neat diagram ?
Question:13).What is meant by refining of metals? Name the most widely used method may be used for refining impure metals produced by varius reduction processes.Describe with the help of a diagram.How this method may be used for refining of copper?
Question:14) Write the name and the structural formula of the compound formed, when ethanol is heated at 444K with excess of concentrated H2SO4 in this reaction. Write chemical equation for the reaction.
Question:15) Why homologous series of carbon compounds are so called? Write chemical formula of two consecutive members of a homologius series and state the part of these compounds that determines their,
(i) Physical properties.
(ii) Chemical properties.
Question:16) Given below are some elements of the modern periodic table:
4Be , 9Fe , 14Si , 19K , 20Ca
(i) Select the element that has one electron in the outermost shell and weite its electronic configuration.
(ii) Select two elements that belong to the same group. Give reasons for your answer.
(iii) Select two elements that belong to the same period. Which one of the twohas bigger atomic size?
Apex Class 
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