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प्रश्न
Name a liquid which can be classified as a pure substance and conducts electricity.
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
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
What is meant by saying that metals are malleable and ductile ?
What is meant by saying that metals are sonorous ?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Give reason why copper metal is used for making electric wires.
The elements which normally exist in the liquid state are :
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
Out of a colloid, solution and a suspension :
which one has the largest particles ?
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Define the Emulsion Give one example.
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
What is chromatography ? State its two applications.
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
What's the solution?
We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.
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?
Name the metals that are used in jewellery.
Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
Gases change to liquid by the process of ______.
