IMMANUEL HIGH SCHOOL

Max Marks: 20                        Date : 12-08-2020                             Time: 40Minutes

1st Science Formative Assessment 12-08-2020

(I) Answer the following in one or two words             1/2 x 4=2

1. What gas is produced when hydrochloric acid is added to iron filings?

2. Why should chemical equation be balanced?

3. What is the process called when electric current is passed through a aqueous solution of sodium chloride?

4. CaOCl2  is the chemical formula of which powder?

(II) Fill in the blanks                                     1/2 x 4=2

5. Reaction in which energy is absorbed is called_____________ reaction

6.   __________reactions produce insoluble salts

7.  A Base turns __________ Litmus __________

8. Acid and Base  neutralize each other to form __________ and water

(III) Answer the following questions                              2 x 4=8

9. Solution A has pH of 6 , solution B has pH of 8 which solution as higher hydrogen ion concentration? which solution is acidic and which one is basic ?

10. What is an exothermic reaction give an example ?

11. Write an equation for decomposition reactions where energy is supplied in the form of (A) light (B) electricity

12. Give two uses of washing soda

(IV) Answer the following questions                                     4 x 2=8

13. Skeletal equation are given,give the balanced equations:

A) H2 + N2 ———–> NH3

B)  H2S + O2 ————> SO2  +  H2O

14. Give an experiment to prove that acids and bases conduct electricity while glucose and alcohols do not

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