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प्रश्न
Name one pair of liquids which can be separated by using a separating funnel.
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उत्तर
Kerosene and water are two immiscible liquids which can be separated by using a separating funnel.
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संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Liquids have definite volume but do not have definite shape.
Fill in the blank
All matter is made up of tiny particles called ______
Name two processes which provide the best evidence for the motion of particles in matter.
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
State two physical properties on the basis of which metals can be distinguished from non-metals.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Which of the two will scatter light : soap solution or sugar solution ? Why ?
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Define Foam Give one example.
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Name the process which is used in milk dairies to separate cream from milk.
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
______ is so hard that it can scratch glass.
Define the term matter.
