Name a reducing agent that may be used to obtain manganese from manganese dioxide.

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(a)

Balance the following chemical equation:
MnO₂ + HCl \(\rightarrow\) MnCl₂ + Cl₂ + H₂O

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Define a chemical reaction. Which observation help you to determine whether a chemical reaction has taken place?

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Write the steps for balancing the chemical equation for the formation of ammonia by the combination of nitrogen and hydrogen.

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2 g ferrous sulphate crystals are heated in a dry boiling tube.
(i) List any two observations.
(ii) Name the type of chemical reaction taking place.
(iii) Write the chemical equation of the reaction.

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(i) Solution of a substance 'X' is used for testing carbon dioxide. Write the equation of the reaction of 'X' with carbon dioxide.
(ii)How is 'X' obtained? Write chemical equation.

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Complete and balance the following chemical equations:
(i) CaCO₃ + HCl
(ii) Al + HCl
(iii) MnO₂ + HCI

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Give the characteristic tests for the following gases:
(a) CO₂
(b) SO₂
(c) O₂
(d) H₂

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What happens when zinc granules are treated with dilute solution of H₂SO₄, HCl, HNO₃, NaCl and NaOH, also write the chemical equations if reaction occurs.

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You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO₃, ZnCl₂ and H₂O. In which of the above containers theses solutions can be kept?

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(a)