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,?

                                                                                  

  class 10 chemistry worksheet
   SOURCE-PREVIOUS YEAR QUESTION PAPER

1. Draw the electron dot structure for
 (a) Ethanoic acid
  (b) Propanone

2.Why does micelle formation take place when soap is added to water?Explain with  the help of a diagram

3. An organic compound A is widely used as a preservative in pickles.This compound reacts with  ethonol to form a sweet smelling compound B.
(i) Identify the compound A
(ii) Write  the chemical reaction for its reaction with ethanol to form compound B
(iii) How can we get compound A from compound B?
(iv) Name the process and write corresponding chemical equation.
(v)Which gas is produced when compound reacts with washing soda? Write the chemial equation.

class 10 REVISION WORKSHEET
 source: pevious year question paper

1. Write chemical equations for the following reactions
(a)  sodium metal is added to ethanoic acid
(b) solid sodium carbonate is added to ethanoic acid
(c)Ehanoic acid reacts with dilute solution of sodium hydroxide

2.(a) Name the products formed when ethane burns in the air.Write a balanced chemical equation for the reaction
(b)Why is reaction between methane and chlorine called a substitution reaction?

3.represent the following reactions with the help of chemical equation
 (a) Esterification
 (b) saponification
  (c) Hydrogenation

Source-CBSE CLASS 10 QUESTION PAPER 2016(SET-1)

1.Write the name and the molecular formula of an organic compound having its name suffixed with ‘ol’ and having two carbon atoms in its molecule. Write a  balanced equation to show what happens when this compound is heated with excess H₂SO₄ and name the main product formed .What is the role of conc. H₂SO₄ in the reaction

2. Ann organic compound ‘P’ is a constituent of wine. P when reacted with acidified K₂CrO₇ forms another compound ‘Q’. When a piece of sodium is added to the compound Q , a gas’ R’ is evolved that burns with a pop sound. Name P,Q AND R.Also write the chemical reactions involved.

3.  a. You have three unlabelled  test tubes containing  ethanol,ethonoic  acid and soap solution. Using litmus paper and sodium metal identify the three substances.

b. Give the cause of formation of scum, when soaps are treated with hard water.

CHEMISTRY WORKSHEET (CLASS-IX)
LESSON- ATOMS AND MOLECULES

1.Calculate the molecular masses of
a.Ammonia
b. Quick lime
c.Baking soda
d.Chlorine gas
e.Methane

2.what is the mass of 0.2 mole of oxygen atoms?

3.calculate the mass percentage of each element of sodium chloride in one mole of it.

4.work out he formulae of the following compounds.also name the ions present in each of them.
a.Magnesium chloride
b.iron sulphide
c.Aluminium sulphate

5 write the formula of the compounds formed by the following ions
a. Ca2+ , CO2_
b. Mg2+, Cl_

CHEMISTRY WORKSHEET (CLASS -10)
LESSON-CARBON AND ITS COMPOUNDS

1. Draw stuctures of the folowing compounds
a.Ethonoic acid
b. Bromopentane
c.Butanone
D.Methyl ethonate
e.Ethyl ethonate

2.Write chemical equations of reaction of ethanoic acid with
 a, Sodium
b.Sodium carbonate
c.Ethanol in presence of con. H2SO4

3.Give a chemical test to distinguish between
a. Soaps and detergents
b. ethane and ethene
c.ethanol and ethanoic acid

4. How many isomers can be drawn for pentane?

5.What is hydrogenation?What is its industrial application?
6. Name the second member of alkynes family.Give its structure

Class 10
Revision questions

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.                                                                                                                                                                                                         (1+1+1)                                                                                                

2.      Based on the reactions given below, arrange the metals involved in these reactions in decreasing                

              order of reactivity. Give suitable explanation.

(i)Zn+CuSO₄ → ZnSO₄+ Cu, 

(ii) Cu+2AgNO_3→Cu(NO₃)₂   ,

(iii)Zn+FeSO₄→ ZnSO₄ + Fe

               (iv)  Fe+ CuSO₄→FeSO₄+Cu.

      (b).What is the nature of the reactions?                                                                                                                                                                                                                             (2+1)

3.      (a) How does baking soda help in extinguishing fire?                                                                                                                                                                                             (1+1+1)   

(b) What is a difference between the two: CaSO₄.2H₂O and 2 CaSO_4. H₂O

            (c) When a drop of grape juice solution is placed on a strip of pH paper .

                 What will be The possible colour of the paper: Deep red or Orange .? Why?        

4.                  4  (a) Electrolysis of strong solution of NaCl is also called Chlor-alkali process   Why?                                                                                                                                                                   (1+1+1)

             (b) What effect does the concentration of H⁺(aq) ions have on the nature of the solution?

             (c) What would you observe on adding dilute HCl to baking soda

.           5. a) The reaction of metal X with ferric oxide solution is highly exothermic in nature and                        used to join  ailway tracks. Identify the X and write the equation with ferric oxide.

               (b) Show the formation CaO by the transfer of electron.

             (c) You are provided with two metals: Sodium and Magnesium .Using only water as the                         reactant,  how will you identify them?

  (d) To convert Zinc sulphide to Zinc oxide is calcination is a best option or not?. Give reason

              (e)Explain why are ionic compounds usually hard?     

            6 An athlete won a bronze medal in a race competition. After some days, he found that the                     medal    had lost its lustre due to the formation of greenish layer on it. Name the metal                         present in the medal. What is the reason for appearance of greenish layer on its                                       surface? 

                7 A reaction is carried out in which a clear aqueous solution of lead (II) nitrate is mixed                       with a solution   of potassium iodide.  A thick yellow precipitate forms in the test                                tube.                                                   (1+1)

a)      Write the name and formula of the two products in this reaction.

b)      What type of reaction is this?

          8. A student dipped strip of pH paper in distilled water taken in atube. As expected the colour               of pH paper remain same. He then dissolved a pinch of common salt in the same test tube.                       What will   be the expected change in colour?

           9 Shweta take two test tubes marked as A and B provided with rubber cork. In the test tube                     marked A   she pour some boiled distilled water along with some oil and in second test tube                   she pour some water.She puts iron nail to both the test tube . What she observe with the                     passage of time?