NCERT Exemplar IV — task. Science CBSE, Class 9.

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Answer the following multiple choice questions:

1. Choose the correct statement of the following

Conversion of vapours into solid without passing through the liquid state is called freezing.
Conversion of solid into vapours without passing through the liquid state is called sublimation.
Conversion of solid into vapours without passing through the liquid state is called vapourisation.
Conversion of solid into liquid is called sublimation.

2. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C, respectively. Which one of the following correctly represents their boiling points in the kelvin scale?

308 K, 329 K, 391 K
308 K, 329 K, 392 K
329 K, 392 K, 308 K
306 K, 329 K, 391 K

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24. NCERT Exemplar IV

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