YSA Model Paper 

Subject: Chemistry X                                 Time Allowed 3.00 hours  

Section  C

Marks: 20

 

Note: Attemp any 2 Questions.

 

Q. 16    . Sulphuric acid behaves in three different ways.

a)         Why H₂SO₄ behaves as a dibasic acid?                                                 (2)       
            b)         How H₂SO₄  is prepared on commercial scale?                                       (6)

c)         Why H₂SO₄  behaves as a dehydrating agents?                                                   (2)

 

Q. 17. Pig iron is extracted from its ores in blast furnace

a. Outline the manufacture of iron from its ores in the blast furnace. Give equations for the reactions at different temperatures. 

                                                                         (1+1+2+1)

b. What is the purpose of adding limestone? How is slag removed from molten iron?   (1+1)

c. Explain manufacture of steel by open-hearth process.                                                (3)

 

Q.18. Carbon and Sulphur have allotropic forms.

a. What is allotropy?                                                                                                     (1)

b. What is the structure of bucky ball and diamond?                                                    (3 +3)

c. Why Buck Balls are named so?                                                                                   (1)

d. What is Catenation?                                                                                      (1)

e. Why Carbon forms Covalent Compounds?                                                                   (1)

 

Class 9th  Model Papers Class 9th  Answer Keys Class 10th  Model Papers Class 10th  Answer   Keys Chemistry  Section A  Section B  Section C Chemistry  Section A  Section B  Section C Chemistry  Section A  Section B  Section C Chemistry  Section A  Section B  Section C Biology  Section A  Section B  Section C Biology  Section A  Section B  Section C Biology  Section A  Section B  Section C Biology  Section A  Section B  Section C Physics  Section A  Section B  Section C Physics  Section A  Section B  Section C Physics  Section A  Section B  Section C Physics  Section A  Section B  Section C Computer  Section A  Section B  Section C Computer  Section A  Section B  Section C Computer  Section A  Section B  Section C Computer  Section A  Section B  Section C Math  Section A  Section B  Section C Math  Section A  Section B  Section C Math  Section A  Section B  Section C Math  Section A  Section B  Section C   Pak  Studies Section A  Section B  Section C