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151.

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?A. `KMnO_(4)` is an oxidising agent and it oxidises `FeSO_(4)`B. (b) `FeSO_(4)` acts as an oxidising agent and it oxidises `KMnO_(4)`C. The colour disappears due to dilution , no reaction in involvedD. `KMnO_(4)` is an unstable compound and decomposes in presence of `FeSO_(4)` to a colourless compound.

Answer» Correct Answer - A
Potassium permanganate `(KMnO_(4))` is an oxidising agent. It oxidises ferrous sulphate to ferric sulphate in the presence of dilute `H_(2)SO_(4)`.
`underset("(Purple)")(2KMnO_(4)) + 8H_(2)SO_(4) + 10FeSO_(4) to K_(2)SO_(4) + 2MnSO_(4) + 8H_(2)O + 5Fe_(2)(SO_(4))_(3).`
Discussion
152.

The sing `darr` indicates.A. Release of gasB. Dissolution of gasC. Formation of precipitateD. Lowering of temperature

Answer» Correct Answer - C
Discussion
153.

A balanved chamical equation always obets `"______"`A. Law of conservation of MassB. Law of thermal equilibriumC. Lawof conservation of energyD. All of the above

Answer» Correct Answer - A
Discussion
154.

Oily food kept out for few days ghives a bad taste and a bad smell because of `"_______"`A. CorrosionB. DisplacementC. HeatingD. Rancidity

Answer» Correct Answer - D
Discussion
155.

Which among the following are physical or chemical changes? (a) Evaporation of petrol (b) Burning of Liquefied Petroleum Gas (LPG) `(c)`Heating of an iron rod to red hot (d) Curdling of milk `(e)`Sublimation of solid ammonium chloride

Answer» (a) Physical (b) Chemical (c) Physical (d) Chemical (e) Physical.
Discussion