9th class physics paper federal board

9th class physics paper federal board part1.9th class physics paper federal board.9/th class physics paper federal board

9th class physics paper federal board
9th cla/ss physics paper federal board

9th class ph/ysics paper federal board part2

9th class physics paper federal board
9th class physics paper federal board

(xi) Write a note on Tin plating supporting it with chemical equations
(xn) a Arrange the fotiowing in the Order of increasing acidic strength’
HF HI. HBr | HOT
b, What is aqua regia? Write its use in Chemistry?
(Hi) a. Why Alkali metals are kept under kerosene ail?
b Complete and balance the following two reactions
Mz,,.+O,,, 7-9 Cu,,,+ H.O,,,—>
(xiv) — Write three conclusions draw’ by Rutherford from his thin metal foil experiment
(xv) Which element in each of the following pairs has lower ionization energy? Explain your choice
a BorN b LiorNa
SECTION — C (Marks 20)
Note: Attempt any TWO questions. All questions carry equal marks. (2 x 10 = 20)
Q.3 a. How many moles of each of the following substances are present in:
{i) A balloon filled with 18¢ #7, gas. (2.5}
{ii} A block of ice tnat weighs 50 (2.5)
b. Define Isotopes Write the physical properties of different forms of carbon. Also draw the
structure of isotopes of carbon (14+2.5+1.5)
Q.4 a. Define shieiding effect Write its trend in periodic table with suitable reason. {1+2)
b. Choose the elements in the following pairs whose atoms have greater shielding effect (02)
{i) Be or Mg {ii) Cor Si
c. Define Boyle’s Law. Ethene gas is kept in 2.Sd1′ container under 1.05 atm pressure. When it
is shifted to another container of 1.25cyi its pressure increased upto 2. 10cm. If temperature
remains constant show that this change is according to Boyle’s law. (1+4)
Qa5 a Expiain with reason that Methanol readily dissolves in water while Gasolene does not (1.5+1.5)
b. How is sodium hydroxide manufactured from Brine by Nelson cell? Draw labelled diagram
and write chemical equations. (3+2+2)

2 comments

  1. Do you have any pointers for creating posts? That’s where I always battle and I just wind up staring empty
    display for very long time.

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