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प्रश्न
Select the correct answer to the statement given below:
A metalloid
विकल्प
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
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उत्तर
Silicon
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संबंधित प्रश्न
Give two examples for the following: Metals
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture
Name the substance you will add to speed up sedimentation.
Define: Compounds
Give one example for the following types of mixtures:
liquid-gas homogenous mixture
Give two examples of the following.
Metals which are soft
Give reason: Graphite is used to make a lead of the pencils.
Fill in the blank
_________ refers to the number of atoms in the molecule of an element
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
Draw a labelled diagram of an atom including its nucleus, orbits & their contents.
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
Select the correct answer from the choice given below.
An element which is a poor conductor of heat
Write the names of elements from the following symbol:
Fe
Select the correct answer to the statement given below:
The chemical name for dinitrogen oxide [N20].
State five different characteristics of compounds.
Give an example of two liquids that form heterogeneous mixtures.
Select the correct answer from A, B, C, D & E for the statement given below :
A diatomic molecule.
Select the correct answer from A, B, C, D & E for the statement given below :
A mixture consisting of elements & a compound.
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
Reason out
Elements are called semimetals.
