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Question

There is usually an apparent change in weight during a


A

Physical change

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B

Reversible

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C

Chemical change

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D

none of these

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Solution

The correct option is C

Chemical change


The explanation for the correct option :

Option (C)

Chemical change: It is a type of change in which there is a change in the chemical properties of the substance and a new substance is formed.

  • It is a type of irreversible change.
  • Irreversible change: It is a type of change that cannot be reversed.
  • Heat will be released or absorbed in this type of reaction.
  • For example, Magnesium(Mg) when reacted with Oxygen(O2) results in the production of Magnesium oxide(MgO), and energy is released in the form of light.
  • Mg(s)Magnesium+O2(g)OxygenMgO(s)MagnesiumOxide+light
  • Though there is no actual change in weight of the substance in chemical conversion between reactant and product.
  • But there is an apparent change in the weight of the reactant.
  • Apparent means something that appears to be real but in actuality, it is not.
  • For example heating of sugar results in the formation of black residue which is carbon
  • Its weight is very less than the weight of sugar and it is known as an apparent change in weight
  • However, the Heating of sugar results in the production of carbon and steam.
  • And if we consider the sum of the weight of carbon and steam then it will be equal to the weight of sugar.
  • The actual weight of the substance will not change.

The explanation for the incorrect option:

Option(A)

  • Physical change: It is a type of change in which there is no change in the chemical properties of the substance and no new substance is formed.
  • It is a type of reversible change
  • For example Melting of ice, freezing of water, etc.
  • There is no apparent change in weight in a physical change.

Option(B)

  • Reversible change: It is a type of change that can be reversed easily.
  • There is no apparent change in weight in a reversible change also.

Therefore, the correct option is option (C).


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