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9th CBSE
IMPORTANT
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Naphthalene balls disappear with time without leaving any residue. Such change is called 

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Important Questions on The Matter in Our Surroundings

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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 17
At 273 K, water is in the state of :
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 18
Steam at 100 Cο causes more severe burns on the skin than water at 100 Cο because
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 19
If the boiling point of a liquid is very high, it indicates that
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 20
We wear cotton clothes in summer because:
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 21
Average kinetic energy of the molecules of the matter is a measure of : 
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 22
Heat needed to melt 1 g of ice at 0 Cο to form water at 0 Cο.
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 23
SI unit of temperature is:
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 1 - The Matter in Our Surroundings>EXERCISE 1D>Q 24
Carbon dioxide gas can be converted into solid state, which is a white fluffy mass. The solid state of carbon dioxide is called: