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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
Differentiate between an atom and a molecule.
Name the terms for the change of vapour into a liquid.
Name the property which allows metals to be hammered into thin sheets.
What is the other name for impure substances ? Give two examples of impure substances.
State two physical properties on the basis of which metals can be distinguished from non-metals.
Name a metal which can be easily cut with a knife.
Name a metal which forms amalgams.
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
How will you separate a mixture containing sand and sugar ?
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Which of the following mixture cannot be separated by using water as the solvent ?
The boiling point of liquid argon is :
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
The fluidity of solids: ______.
Evaporation is always accompanied by ______ in temperature.
Give an example of a molecule.
