Roll No:                               class 10 worksheet                                                    metals and non metals	Time:
Date :	MM :

1	A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.	1
2	Why does calcium float in water ?	1
3	Arrange the following metals in the decreasing order of reactivity : Na, K, Cu, Ag	1
4	From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal (a) which reacts with water only on boiling, and (b) another which does not react even with steam.	1
5	An element forms an oxide, A2O3 which is acidic in nature. Identify A as a metal or non-metal.	1
6	What is the valency of an element with atomic number 35 ?	1
7	A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. What could this green substance be ?	1

8	Name the following: (a) A metal, which is preserved in kerosene. (b) A lustrous coloured non-metal. (c) A metal, which can melt while kept on palm. (d) A metal, which is a poor conductor of heat.	2
9	X + YSO4 → XSO4 + Y Y + XSO4 → No reaction Out of the two elements, ‘X’ and ‘Y’, which is more reactive and why ?	2
10	Write chemical equations that shows aluminium oxide reacts with acid as well as base.	2
11	Elements magnesium and oxygen respectively belong to group 2 and group 16 of the Modern Periodic Table. If the atomic numbers of magnesium and oxygen are 12 and 8 respectively, draw their electronic configurations and show the process of formation of their compound by transfer of electrons.	2
12	Mention the names of the metals for the following: (a) Two metals which are alloyed with iron to make stainless steel. (b) Two metals which are used to make jewellary.	2
13	A student has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and green coating on copper coins. Give the chemical name of black and green coating. How are they formed ?	2
14	What is 24 carat gold ? How will you convert it into 18 carat gold ?	2

15	What is meant by reactivity series of metals? State which of the following chemical reactions will take place giving suitable reason for each. (a) Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) (b) Fe(s) + ZnSO4(aq) → FeSO4(aq) + Zn(s) (c) Zn(s) + FeSO4(aq) → ZnSO4(aq) + Fe(s)	3
16	Observe the two test tubes A and B in the diagram given below and answer the following questions: (a) In which test tube will the reaction take place ? (b) Write a balanced equation for the reaction. (c) Name the type of reaction.	3
17	(a) What are amphoteric oxides? Choose the amphoteric oxides from amongst the following oxides: Na2O, ZnO, Al2O3, CO2, H2O (b) Why is that non-metals do not displace hydrogen from dilute acids?	3
18	A student was given Mn, Zn, Fe and Cu metals. Identify which of them (a) will not displace H2 from dil. HCl. (b) will react only with steam to give H2(g). (c) will give H2 with 5% HNO3. Write the chemical reactions involved.	3
19	(a) Show the formation of Na2O by the transfer of electrons between the combining atoms. (b) Why are ionic compounds usually hard? (c) How is it that ionic compounds in the solid state do not conduct electricity but they do so when in molten state?	3
20	Suggest a method of reduction for the following metals during their metallurgical processes: (a) metal ‘A’ which is one of the last second or third position in the reactivity. (b) metal ‘B’ which gives vigorous reaction even with water and air. (c) metal ‘C’ which is kept in the middle of activity series.	3
21	What is cinnabar? How is metal extracted from cinnabar? Explain briefly.	3
22	A metal ‘X’ acquires a green colour coating on its surface on exposure to air. (a) Identify the metal ‘X’ and name the process responsible for this change. (b) Name and write chemical formula of the green coating formed on the metal. (c) List two important methods to prevent the process.	3

23	(a) Define activity series of metals. Arrange the metals gold, copper, iron and magnesium in order of their increase in reactivity. (b) What will you observe when: (i) Some zinc pieces are put in copper sulphate solution. (ii) Some silver pieces are put into green coloured ferrous sulphate solution.	5
24	A metal (E) is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue. (a) Name the metal (E). (b) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water. (c) Explain the process by which the metal is obtained from its molten chloride.	5
25	(a) Write electron dot structure for chlorine (At No. 17) and calcium (At No. 20). Show the formation of calcium chloride by the transfer of electrons. (b) Identify the nature of the above compound and explain three physical properties of such compounds.	5
26	(a) In the formation of compound between two atoms A and B, A loses two electrons and B gains one electron. (i) What is the nature of bond between A and B ? (ii) Suggest the formula of the compound formed between A and B. (b) On similar lines explain the formation of MgCl2 molecule. (c) Common salt conducts electricity only in the molten state. Why ? (d) Why is melting point of NaCl high ?	5
27	(a) Differentiate between roasting and calcination. Explain the two with the help of suitable chemical equations. How is zinc extracted from its ore ? (b) Name two metals that can be used to reduce metal oxides to metals.	5
28	(a) Carbon cannot be used as reducing agent to obtain Mg from MgO. Why? (b) How is sodium obtained from molten sodium chloride? Give equation of the reactions. (c) How is copper obtained from its sulphide ore? Give equations of the reactions.	5

 omit que 16

PERIODIC CLASSIFICATION OF ELEMENTS

WORKSHEET

1.A substance “X” Which is an oxide of a group 2 element is used for white washing. On treatment with   water it forms “Y” .The solution of “Y” turns red litmus blue.

(a)    Identify  “X” and “Y”

(b)   Write the chemical equation

            (c) Explain reason why red litmus changes to blue.

2   (a)Which element was named as “Eka – Silicon” in Mendeleev’s periodic table?                                  

 (b)Can the elements Na, Si and Cl classified as Triads? Support reason

    (c) Arrange the following in decreasing order of metallic character. Support your answer with  reason

        Na, N, Mg, F, O

      3  (a)State reasons for the following:                                                                                                      

        (i)Both Mg and O have valency equal to 2 .Are they chemically similar also?

       (ii)Out of C,B and N elements , which has the maximum size? Why?

      (b)Find the period of the following elements having atomic number: 19and 9

4 Account for the following:

(a)    Elements in a group of the periodic table have similar chemical properties                                   

(b)   Discuss any two drawbacks of Mendeleev’s periodic table

5.(a)What property do all the elements in the same column of periodic table as the Boron have in common?

(b)What property do all the elements in the same column of oeriodic table as the Fluorine have in common?

6. (a) Lithium, sodium and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

(b) Helium is an un-reactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

7.  By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?

Ga, Ge, As, Se, Be

8 Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?

9. Why do you think the noble gases are placed in separate group?

10. Why do you think the noble gases are placed in separate group?

11.  An atom has electronic configuration 2, 8, 7.

(a) What is the atomic number of this element?

(b)To which of the following elements would it be chemically similar?

(Atomic numbers are given in parentheses.)

N(7), F(9), P(15), Ar(18)

12.  The position of three elements A, B and C in the Periodic Table are shown below:

(a) State whether A is a metal or non-metal.

(b) State whether C is more reactive than A

(c) Will C be larger or smaller in size than B?

(d) Which type of ion, cation or anion, will be formed by element A?

13.  Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

14. Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table

15. Element X forms a chloride with the formula  which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as

(a) Na

(b) Mg

(c) Al

(d) Si

16. Which element has

(a) two cells, both of which are completely filled with electrons?

(b) the electronic configuration 2, 8, 2?

(c) a total of three shells, with four electrons in its valance shell?

(d) twice as many electrons in its second shell as in its first shell?

17.How many groups and periods are there in Modern periodic table? How do  the atomic size and metallic character of elements vary as we move

(a0 down the group

(b) across the period

18.(a) From the elements select the element having one electron in the outermost shell

₄Be, ₉F₁₉K, ₂₀Ca

(b) two elements of the same group

(c)Write the formula and the nature of the compound formed by the union of 19K and eleent X(2,8,7)

19. Calcium is an element with atomic no 20.Statereason

(a) is calcium metal or non metal?

(b)Wil its atomic radius be larger or smaller than that of potassium with atomic no.19?

(c) write the formula of its oxide.

20. Two elements P and Q belong to  the same period of the modern periodic table and are in group I and Group II  respectively. Compare their following characteristics  in tabular form

(a) The no of electrons in their atoms

(b) The sizes of their atoms

(c) Their metallic characters

(d) Their tendencies to lose electrons

(e) the formula of their oxides

(f) the formula of their chlorides

21. Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to the position in modern periodic table and how valency of  an element is calculated on the basis of its atomic number.

22. An element X (2,8,2) combines with NO₃^-, SO₄^2-, PO₄³- RADICALS. Write the formula of the three compounds formed .To which group of the periodic table does the element X belong? Will it form ionic or covalent compound,?