When a substance adds hydrogen to it or eliminate oxygen from it, we say that the substance has been ———(oxidised/reduced)

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Solution

When a substance adds hydrogen to it or eliminates oxygen from it, we say that the substance has been Reduced.
Reduction
When a substance adds hydrogen to it or eliminates oxygen from it, then the substance is reduced and the process is known as reduction.
The substance that causes reduction is called the reducing agent.
Example: Addition of Hydrogen to Fluorine
$\underset{Fluorine}{F_{2}} + \underset{Hydrogen}{H_{2}} \to \underset{Hydrogen fluoride}{2 HF}$

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Similar questions

Q. (a) Define the following in terms of gain or loss of hydrogen with one example each:
(i) oxidation (ii) reduction
(b) When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

(a) Explain the following in terms of gain or loss of oxygen with one example each :

(i) oxidation (ii) reduction

(b) When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

Q. Which of the following is true for a substance that is oxidized in a chemical reaction–oxygen is added to it, hydrogen is removed from it, or both are true?

Q. If a substance gains oxygen during a reaction, it is being oxidized. If it loses oxygen, it is being reduced. Oxidation and Reduction always take place together, so that if one substance is oxidized, another is reduced. Using this idea, say which substance is oxidised and which substance is reduced in each reaction.
i)

M g (s) + O_{2} (g) \to 2 M g O (s)

ii)

Z n O + C \to Z n + C O

iii)

F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}

iv)

C r_{2} O_{3} + 2 A l \to 2 C r + A l_{2} O_{3}

Q. What do we mean when we say that a substance has gone rancid ?

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