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Chemical Reactions

Which of the ...

Question

Which of the following are chemical changes?
(A) Decaying of wood
(B) Burning of wood
(C) Growth of wood in a tree
(D) Cutting of wood

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Q. Which of the following are physical changes and which are chemical changes ?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.

Q. Question 7
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Q. Can the cutting of wood be represented as physical change and burning of wood as chemical change?

burning of wood and cutting of wood is both chemical and physical change take place?

Which of the following are the examples of a chemical reaction?

i. Burning of wood

ii. Cutting of wood

iii. Conversion of steam to water

iv. Rusting of almirah

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