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प्रश्न
The three important metalloids are.............................. and ..........................
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उत्तर
The three important metalloids are boron, silicon, and germanium.
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संबंधित प्रश्न
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Name a metal which is soft and a non-metal which is hard.
Name the property which allows metals to be hammered into thin sheets.
What is meant by saying that metals are malleable and ductile ?
The property/properties which enable copper metal to be used for making electric wires is/are :
Choose the correct answer.
A 15% alcohol solution means :
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
What is meant by the concentration of a solution ?
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
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.
Explain how, nitrogen , oxygen and argon gases are separated from air.
The material which is added to water during purification process at the water works so as to disinfect it is :
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 ?
Diffentiate between absorption and adsorption.
Which among the following is not a matter?
Gas-solid is ______.
Define the term matter.
