Assignment – 5
Chemical Reactions and Equations
Q 21.
What happens to green coloured Iron sulphate crystals on heating?
Q 22.
Why does white precipitate of AgCl changes to grey on exposure to light?
Q 23.
Why do silver or gold not react easily when expose to air or light?
Q 24.
Why does ZnSO4 solution not react with Cu(s)?
Q 25.
How would you conclude that rusting is a slow electrochemical reaction?
Q 26.
Why does milky white lime water, on exposure to air on walls give white colour?
Q 27.
What type of reaction is common in burning of food and fuel?
Q 28. Why
does stainless steel not rust easily?
Q 29.
In cracker of festivals, which reaction is involved?
Q 30.
Why does iron coated with zinc?
Q 31.
Why platinum does not react with dilute sulphuric acid?
Q 32.
Why does white mass settle down in a test tube when BaCl2 solution
is added to NaCl solution?
Q 33.
Is it possible to get silver when AgNO3 (aq) with copper when
solution is heated?
Q 34.
In protection of steel heavy machines why does machines are joined with
magnesium plate?
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