1. [D] heating copper wire in the presence of air at high temperature A chemical reaction is a change in which one or more substance or reactants react to form new substance with entirely different properties. Heating of copper in presence of air at high temperature gives copper oxide. Such as: 2Cu + ORead more

    [D] heating copper wire in the presence of air at high temperature
    A chemical reaction is a change in which one or more substance or reactants react to form new substance with entirely different properties. Heating of copper in presence of air at high temperature gives copper oxide. Such as:
    2Cu + O₂ → 2CuO

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  2. The maximum displacement of the bob from its mean position on either side is called the amplitude of oscillation.

    The maximum displacement of the bob from its mean position on either side is called the amplitude of oscillation.

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  3. The objects which change their position with time are said to be in motion.

    The objects which change their position with time are said to be in motion.

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