The following reaction is used for the preparation of oxygen gas in the laboratory:
$2KClO_{3(s)} \xrightarrow[Catalyst]{Heat} 2KCl_{(s)} + 3O_{2(g)}$
Which of the following statement$(s)$ is(are) correct about the reaction?

  • A
    It is a decomposition reaction and accompanied by release of heat
  • B
    It is a combination reaction
  • C
    It is a decomposition reaction and endothermic in nature
  • D
    It is a photochemical decomposition reaction and exothermic in nature

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$A$ reddish-brown coloured metal, used in electrical wires, when powdered and heated strongly in an open china dish, its colour turns black. When hydrogen gas is passed over this black substance, it regains its original colour. Based on the above information, answer the following questions:
$(i)$ Name the metal and the black coloured substance formed.
$(ii)$ Write balanced chemical equations for both the reactions.

The substances which get oxidised easily can be kept for longer duration by:

Give a reason why:
$(i)$ Why is a decomposition reaction called the opposite of a combination reaction?

Translate the following reactions into balanced chemical equations:
$(i)$ Manganese dioxide is heated with aluminium powder.
$(ii)$ Iron is treated with steam.

$2 \, g$ of ferrous sulphate crystals are heated in a boiling tube.
$(i)$ State the colour of ferrous sulphate crystals both before heating and after heating.
$(ii)$ Name the gases produced during heating.
$(iii)$ Write the chemical equation for the reaction.

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