FUNCTIONING OF NEPHRON

NEPHRON

COMPOSITION OF ALLOYS

BRONZE  :  COPPER [ 88 %] & TIN [ 12 % ]

BRASS     :  COPPER [ 70 %] & ZINC [ 30 % ]

SOLDER  :   LEAD [ 40 %] & TIN [ 60 % ]
Amalgam is an alloy containing mercury [Hg].[Hydrargyrum]

X SA I TEST CHEM REACTION, ELECTRICITY, CONTROL & COORDINATION

X TEST – SCIENCE- CHEMICAL REACTION, ELECTRICITY, CONTROL & COORDINATION               M.M: 40

1.       [1]Define  electric  circuit.   Distinguish between open  and  closed  circuit.                                       

2.       [1] What  is meant by skeletal  equation ?                                                                                                

3.       [2]What  is a redox  reaction?   Write  down a chemical  equation representing it.           

4.       [3]Ram has  met  with  an accident after  that  he lost the  capacity to                                                

(i)      walk  in straight line         (ii)     smell  anything           (iii)    does  not feel full after  eating

Which  part  of brain  is damaged in each  case.

5.       [3]Name  the hormone secreted by ovary,  testes  and  adrenal glands.  Write  a function of each  hormone.

6.       [1,1] (a)     What  material is used  in making the filament of an electric  bulb  ?                                  

                   (b)     Name  the characteristics which  make  it suitable for this.

7.       [2] Differentiate overloading and  short  circuiting.                                                                        

8.       [2] Mention the components of the transport system in highly  organized plants.  State the functions of these  components.

9.       [2] What  is meant by thermal decomposition reaction ?  Explain  with  an example.                 

10.    [2] An aluminium can is used  to store Ferrous sulphate solution. It is observed that in few days  holes  appeared in the can.   Explain  the observation and  write  chemical  equation to support your  answer.

11.    [3] A piece of wire of resistance 20Wis drawn out so that its length  is increased to twice its original length.  Calculate the resistance of the wire  in the new  situation.

12.    [3] (a)     What  is the total  resistance of n resistors each of resistance ‘R’ connected in :             

                (i)      Series  (ii)     Parallel

13.     [3] Name  the hormone secreted by thyroid gland.  Write its function.  Why is it important for us to have  iodised salt in our  diet ?

14.    [3]How  does  feed-back mechanism regulate the hormone secretion ?                                         

15.    [3] Give  three  differences between displacement and  double displacement reaction.               

16.    [5]Four  metals  A,B,C and  D are inturn added to the following solutions one by one.   The observations made are tabulated below.

Metal	Iron (II) sulphate	Copper (II) Sulphate	Zinc sulphate	Silver nitrate
A	No reaction	Displacement	-	-
B	Displacement	-	No reaction	-
C	No reaction	No reaction	No reaction	Displacement
D	No reaction	No reaction	No reaction	No reaction

Answer the following questions based  on the above  information.

 (i)     Which  is the most  active  metal  and  why  ?

(ii)     What  would be observed if B is added to a solution of copper sulphate and  why.

(iii)    Arrange the metals  A,B,C and  D in order of increasing reactivity.

(iv)    Container of which  metal  can  be used  to store  both  Zinc sulphate solution and silver nitrate solution.

(v)     Which  of the above  solutions can be easily stored in a container made up  of any of these  metals.

X SA I TEST CHEMISTRY

TEST– X /SCIENCE [CHEMISTRY]

TIME:90Min.                                                                                                                                                                               M.M. 60

1.       [1]Name two metal which has low melting point.

2.       [1]Name a non-metal which is extremely hard.

3.       [1]Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

4.       [1]What happens when calcium reacts with water ? Write the equation of the reaction of calcium with

5.       [1]What is aqua-regia ? Can it dissolve gold metals?

6.       [2]Arrange the following metals in order of their chemical reactivity, placing the most reactive first :Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium

7.       [2]What will happen if a strip of zinc is immersed in a solution of copper sulphate.

8.       [2]A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution. Give reaction

9.       [2]Name one metal which displaces copper from copper sulphate solution and one which does not. Give reaction

10.    [2]What type of oxide are formed when non-metals combine with oxygen ? Explain with the help of an example. Is it basic or acidic? Give appropriate reaction to justify.

11.    [2]Explain why metals do not liberate hydrogen gas with dilute nitric acid. Which metals do so. Give reaction

12.    [2]Give reason for the following :

Carbonate and Sulphide ores are usually converted into oxides during the process of extraction.

13.    [2]Explain giving one example, how highly reactive metals ( which are high up in the reactivity series ) are expected.

14.    [2]How is manganese extracted from manganese dioxide MnO₂ ? Explain with the help of an equation.

15.    [2]What is a thermit reaction ? Explain with the help of an equation. State one use of this reaction.

16.    [2]What  is the brown coloured gas evolved when lead nitrate crystals  are heated in  a dry test tube  ?

17.    [2]On mixing  solutions of lead  nitrate and  potassium iodide in a test tube.                                  

(a)     Write  the chemical  equation involved in the balanced form.

(b)     What  is the colour  of the precipitate ?  Name  the precipitate.

18.     [1,1,3]What is chlor-alkali process? Write its products and their uses. ( 3 each)

19.    [3]What are amphoteric oxide ? Give examples of two amphoteric oxide.Show their reactions.( All 4

reactions)

20.    [3]Define the terms ; (i) mineral, (ii) ore, and (iii) gangue.

21.    [3]A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the

conversion of this concentrated ore into zinc metal.

22.    [3]Compounds like alcohol and glucose also contain hydrogen but are not characterized as acids. Describe an activity to prove it.

23.    [3]Write following reactions

(a)                An acid with Metal Carbonate & Metal bi-carbonate

(b)                How to identify the gas evolved by above reactions. Write equation.

24.    [4]Write about followings:

(a)                Do metals reacts with base to evolve hydrogen gas. If yes write reaction.

(b)                What is hydronium ion ?

(c)                Do basic solutions also have H+(aq) ions? If yes ,then are these basic?

25.    [4] (a)     What  are  redox  reactions ?                                                                                                       

(b)     Why  the  reaction between Manganese dioxide and  Hydrochloric acid  is redox reaction ?

(c)     Identify the substance oxidised and  the substance reduced in the above  reaction.

26.    [5] (a)     Name  the components of the alloys  steel and  stainless steel.

(b)     Why gold  is alloyed with  copper ?

(c)     Name  a metal  which & give reaction

(i)      will react  vigorously with  cold water

(ii)     will react  with  only  hot  water

(iii)    will only  react   with   steam

X SAI TRIANGLE TEST 1

X SAI TRIANGLE TEST 1

M.M. 30                                                                                                                                                     TIME:  75 MIN                                                                                                                                

1.        [3]   In the adjoining figure, P is a point on the side BC of AABC such that     MP ║ AB and NP ║ AC. If MN and CB produced meet in Q, prove that    PQ² = QB x QC.

2.        [3]   Using Basic Proportionality theorem  prove that the line drawn through the mid-point of one side of a triangle parallel to another side bisects the third side.

3.        [2]   In the adjoining figure, DE ║ AQ and DF ║ AR. Prove that EF ║ QR

.

4.        [3]   ABCD is a trapezium in which AB ║ DC and its diagonals intersect each other at O. Using Basic Proportionality theorem, prove that .

.

5.        [2]   Let ∆ABC ~ ∆DEF and their areas be 64 cm² and 121 cm² respectively. If EF = 13.2 cm , find BC.

6.        [3]   Prove that the ratio of the areas of two similar triangles is equal to the square of the ratio of their corresponding medians.

7.        [3]   Prove that  in a triangle, if square of one side is equal to the sum of the squares of the other two sides, then the angle opposite the first side is a right angle.

8.        [3]   In the adjoining figure, ABD = CDB = PQB = 90°. If AB = x units, CD = y units and PQ = z units, prove

9.        [4]   In an equilateral triangle ABC, a point D is taken on base BC such that BD : DC = 2 : 1. Prove that 9 AD² = 7AB².                    

10.     [4]   In Figure given alongside, ABC is a triangle in which ∠ ABC < 90° and AD  BC. Prove that                    AC² = AB²  + BC²  – 2 BC . BD.

                 

OPTIONAL / HOME WORK

11.     In the adjoining figure, M is the mid-point of the side CD of parallelogram ABCD. The line BM is drawn intersecting AC in L and AD produced in E. Prove that    EL = 2 BL.

12.     Two isosceles triangles have equal vertical angles and their areas are in the ratio 16 : 25. Find the ratio of their corresponding>heights.

13.     Prove that the ratio of the areas of two similar triangles is equal to the square of the ratio of their corresponding altitudes.

X SA I CHEM TEST FULL SYLLABUS 5

1.           What  chemical  process  is used  for obtaining a metal  from  its oxide  ?                                       

2.           Complete and  Balance  the  reaction                                                                                          

Fe₂O₃ + Al →  

3.           What  do  you  see when  penta-hydrated copper  sulphate crystals  are  heated.  Give  reaction too.

4.           (a)     Fe + CuSO₄  →      FeSO₄ + Cu                                                                                                       

(b)     Cu + FeSO₄    →    CuSO₄  + Fe

Which  of the above  two  reactions will take  place  and  why  ?

5.           Why is sodium kept  immersed in kerosene oil ?                                                                             

6.           Name  two  salts  that  are  used  in black  and  white  photography.  Give  reactions when  they  are exposed to light.

7.           You have  been  provided with  three  test  tubes.  One  of them  contains distilled water and  the other  two  contain an acidic  solution and  a basic solution respectively.  If you are given  only  red  litmus  paper, how  will you  identify the contents of each test tube  ?

8.           (a)     What  do you see when a magnesium ribbon  is burnt ? Is magnesium oxidized or reduced in this  reaction.

(b)     Define  corrosion.

9.           (a)     All ores are minerals but  all minerals are not ores. Justify  the statement.                   

(b)     What  is Galvanisation ?

(c)     Give composition of brass  and  bronze

(d)     Explain  roasting with  help  of a reaction.

(e)     What  do you  mean  by amalgam ?

OR

With  reference to electrorefining of impure copper, answer the following :

(a)     Draw  a neat  and  labelled diagram requised for the purpose of electrorefining.

(b)     What  is electrolyte used  ?

(c)     Name  the cathode and  anode used  ?

(d)     What  happens at cathode and  Anode ?

X SA I CHEM TEST FULL SYLLABUS 4

1.           Name  a Non-metal which  is lustrous and  a metal  which  is Non—lustrous.                              

2.           Balance  the  following chemical  equations :                                                                                 

Pb(NO₃)₂ (s)      H  e at      PbO(s) + NO₂ (g) + O₂ (g)

3.           With the help  of a suitable example, explain  0xidation and  Reduction in terms  of gain or loss of oxygen.

4.           Respiration is considered as exothermic reaction.  Explain  why  ?                                              

5.           Name  the  chemicals used  in the  Acid  Fire extinguisher and  the  gas  evolved from  it when  used  ?

6.           Explain  why  Calcium metal  after  reacting with  water  starts  floating  on  its surface  ? Write  the  chemical  equation for the  reaction.

7.           What  are exothermic and  endothermic reaction.  Explain  with  the help  of one example each.

8.           A sanitary worker uses a white  chemical  having strong smell of chlorine gas to disinfect the  water tank.

 (a)     Identify the  chemical  compound. (b)     Write  the  chemical  formula.

(c)     Write  chemical  equation for preparing it.

9.            How  baking  soda  is manufactured ?  Write  chemical  equations.  Write  two  important  uses of it.

10.         (a)     How  copper is obtained from  its ore ?  Write  equations.                                               

(b)    How  impure copper is refined by electrolytic refining ?  Draw  diagram and  write reactions at cathode and  anode.

OR

Write  balanced chemical  equation for the  reactions taking  place  when

(i)      Zinc  carbonate is calcinated.

(ii)     Zinc sulphide is roasted.

(iii)    Zinc oxide  is reduced to Zinc.

(iv)    Cinnabar is heated in the  air.

(v)     Magnese dioxide is heated with  Aluminium Powder.