Assignment 2 - Chemical Reactions and Equations | Class 10th

Assignment – 2

Chemical Reactions and Equations

16. Why should a magnesium ribbon be cleaned before burning in air?

17. Write the balanced chemical equation with state symbols for the following reactions?

i. BaCl2(aq) + Na2SO4 (aq)  →  

ii. NaOH (aq) + HCl (aq)   → 

18. A solution of a substance ‘X’ is used for white washing

i. Name the substance ‘X’ and writes its formula.

ii. Write the reaction of the substance ‘X’ named in (i) above with water

19. In refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.

20.What do you mean by a precipitation reaction? Explain by giving examples.

21. A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.

22. Why do we apply paint on iron articles?

23. Oil and fat containing food items are flushed with nitrogen. Why?

24. Write a balanced chemical equation with state symbols for the following reactions.

(i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.

(ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.

25. Balance the following chemical equations.

(a) HNO₃  +  Ca(OH)₂   →   Ca(NO₃)₂   +   H₂O

(b) NaOH  +   H₂SO₄    →    Na₂SO₄    +   H₂O

(c) NaCl   +   AgNO₃    →    AgCl   +   NaNO₃

(d) BaCl₂   +   H₂SO₄   →   BaSO₄   +    HCl

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