practical based questions of chemistry class 10
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Question 1.
Mention the temperature of the following in degree Celsius and Kelvin Scales
Ice and ice cold water
Boiling water and steam.
Answer:
6°C and 273K
100°C and 373K.
Question 2.
Rima took fine chalk powder, egg albumin, starch powder and alum powder in four test tubes. A, B, C and D respectively. After adding water to all the four test tubes, identify the test tubes as true solution, suspension and colloid. (CBSE 2013)
Answer:
Test tube A : Suspension; Test Tube B : Colloidal solution; Test Tube C : Colloidal solution; Test Tube D : True solution.
Question 3.
A student added water to sand and starch in different test tubes. How will you differentiate between the two on the basis of transparency ? (CBSE 2013)
Answer:
The solution of sand in water is a suspension and is opaque. On the other hand, the solution of starch in water is colloidal and is transleucent. This means that the light can pass partially through the second solution. (CBSE 2013)
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