O-II CHEMISTRY

THE AMERICAN FOUNDATION CAMBRIDGE SCHOOL FIRST MIDTERM ASSESSMENTS SESSION 2021 – 2022 CHEMISTRY (5070) Level: O. II

Max. Marks: 25

Name: ________________________

Time: 1 hour

Note : Attempt all questions, write in the spaces provided, use only blue or black pen, use pencil for diagrams. Q.1. Write the formula of the given compounds . Name of Compound

Formula

Ammonium Sulfate Aluminium Nitrate Copper Sulfate Iron (iii) Oxide Potassium Iodide (5) Q.2. Fill in the blanks to balance the equations. 1. ________________ + _________________ = 2. 2𝐻 +

+ 𝑆𝑂4−2

𝑀𝑔 (𝑂𝐻)2

= _____________________

3. _________________ + _________________ = 𝐻2 O 4. _________________ + _________________ = 𝐴𝑙2 (𝑆𝑂4 )3 5. 𝐶𝑎+2

+ ________________ = 𝐶𝑎° (4)

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Q.3.

(c) Draw the setup of electrolysis required for the purification of copper.

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[4]

Q.4. Aluminium metal is extracted by electrolysis of Alumina. a. Write the formula for Alumina. _____________________________________________________________________________________[1] b. Cryolite is added to Alumina during this process , write formula of Cryolite and the reason for its addition. _______________________________________________________________________________________ _______________________________________________________________________________________ ____________________________________________________________________________________[2] c. Give the Anodic and Cathodic reaction equations for this reaction. At Anode :_________________________________________________________________[1] At Cathode :_______________________________________________________________[1] d. Give two uses of Aluminium metal with reason . _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ ____________________________________________________________________________________[2] e. Why Aluminium shows apparent lack of reactivity . _______________________________________________________________________________________ ____________________________________________________________________________________[1]

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