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प्रश्न
Name a liquid which can be classified as a pure substance and conducts electricity.
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उत्तर
Mercury is a liquid metal that can be classified as a pure substance and a good conductor of electricity.
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संबंधित प्रश्न
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
Solids have definite shape and definite volume.
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
What is meant by saying that non-metals are brittle ?
What elements do the following compounds contain ?
Sugar, Common salt
What is the other name for impure substances ? Give two examples of impure substances.
Give reason why graphite is used for making elecrode in a dry cell.
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
One of the following does not show Tyndall effect. This one is :
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
How is the impurity of iron present in several substances removed in industries ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Explain the meaning of the term ‘matter’.
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Give an example of a molecule.
