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प्रश्न
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
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उत्तर
An element is made up of only one kind of atoms.
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संबंधित प्रश्न
All kinds of matter
Name the property which enables metals to be drawn into wires.
What elements do the following compounds contain ?
Sugar, Common salt
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Give reason why copper metal is used for making electric wires.
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
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
How will you test whether a given solution is a colloidal solution ?
Define solubility of a substance. How does it vary with temperature ?
What is the effect of temperature on the solubility of solids in liquids ?
What is a suspension ? Give two examples of suspensions.
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 ?
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
Describe a method to separate a mixture of common salt and sand.
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
How will you separate iron pins from sand ?
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Which one of the following scrap metal cannot be separated by magnetic separation ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
