Which of the following changes are chemical and irreversible?
A. Bubbling of oxygen gas through water.
B. Burning of wax of a candle.
C. Emitting of light from an electric bulb on passing electric current.
D. Passing of carbon dioxide gas through lime water.

A and B

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C and D

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B and D

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A and D

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Solution

The correct option is C B and D
Burning of candle wax and passing $C O_{2}$ through lime water are chemical and are irreversible. In both these changes, new products are formed. Burning of candle wax results into formation of $C O_{2}$ and $C O_{2}$ on passing through lime solution forms $C a C O_{3}$ .
$C O_{2} + C a (O H)_{2} \to C a C O_{3} + H_{2} O$

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Similar questions

Classify the following as chemical or physical changes:

• Cutting of trees

• Melting of butter in a pan

• Rusting of almirah

• Boiling of water to form steam

• Passing of electric current through water, and water breaking down into hydrogen and oxygen gas

• Dissolving common salt in water

• Making a fruit salad with raw fruits

• Burning of paper and wood

Separate the following into physical and chemical changes:

Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing an electric current,

Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water

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