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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
Intermolecular space is maximum in .......... less in ............ and the least in .........
Name the terms for the change of a solid into liquid.
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Explain why steel is used to make railway lines.
Name a non-metal which is a good conductor of electricity.
State whether colloidal solutions are homogeneous or heterogeneous.
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
How will you test whether a given solution is a colloidal solution ?
What is meant by a solution?
One of the following is a solid foam. This one is :
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Name the process by which common salt is purified.
How is cream separated from milk ?
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
Matter is made up of ______.
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
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
