$A$ 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
    $FeSO_4$ acts as an oxidising agent and oxidises $KMnO_4$.
  • B
    $KMnO_4$ is an oxidising agent,it oxidises $FeSO_4$.
  • C
    The colour disappears due to dilution; no reaction is involved.
  • D
    $KMnO_4$ is an unstable compound and decomposes in presence of $FeSO_4$ to a colourless compound.

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Write true or false for the following statement:
Due to corrosion, iron gets a brown coating, copper gets a green coating, and silver gets a black coating.

$A$ silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
$(a)$ Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.
$(b)$ Name the black substance formed and give its chemical formula.

Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
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$(b)$ Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.

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)

Which is the reducing agent in the following reaction?
$MnO_{2}(s) + 4HCl(aq) \longrightarrow MnCl_{2}(s) + 2H_{2}O(l) + Cl_{2}(g)$

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