Which of the following is not a chemical change?
A) rusting of iron
B) converting water into steam
C) making curd from milk
D) heating coal
Correct Answer:
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Q12: Continuous fever, headache, slow pulse, pain in
Q13: Bark of which plant yields famous drug
Q14: If there were no ultraviolet rays reaching
Q15: Smog is a combination of
A)fire and water
B)smoke
Q16: Sound becomes a hazardous noise pollution if
Q17: Maximum threat to the world is from
Q18: Which of the following is the symbol
Q19: Which of the following is least compressible?
A)gas
B)liquid
C)solid
D)none
Q21: Atomicity of Phosphorous is
A)1
B)2
C)4
D)6
Q22: The number of atoms present in a
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