Q. 264.4( 13 Votes )
(a) What is a redox reaction? Explain with an example.
(b) When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidized or reduced? Why?
(c) In the reaction represented by the equation:
MnO2 + 4HCl → MnCl2 + 2H2O +Cl2
(i) name the substance oxidised.
(ii) name the oxidising agent.
(iii) name the substance reduced.
(iv) name the reducing agent.
In the above reaction, copper oxide is reduced to copper whereas hydrogen is oxidized to water.
(b)Magnesium is oxidized because oxygen is added to magnesium creating MgO which leads to the ribbon burning with dazzling flame
(c) MnO2 + 4HCl → MnCl2 + 2H2O +Cl2
(i) HCl is oxidized.
(ii)MnO2 is oxidizing agent.
(iii)MnO2 is getting reduced.
(iv) HCl is reducing agent.
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Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to:
(i) The formation of silver by decomposition of silver chloride
(ii) Sublimation of silver chloride
(iii) Decomposition of chlorine gas from silver chloride
(iv) Oxidation of silver chlorideEvergreen Science
Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)Evergreen Science
(b)Lakhmir Singh & Manjit Kaur - Chemistry