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प्रश्न
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
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उत्तर
A mixture is an impure substance containing more than one element or compound, mechanically mixed together in any proportion and the mixture retains the properties of its constituents i.e. elements or compounds.
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संबंधित प्रश्न
Fill in the blank
A pure substance has definite.................. and constant ..............
Fill in the blank
Use of a ................. to separate the components of a mixture of solids is based on the difference in the size of the components
Name the substance you will add to speed up sedimentation.
Name: a non-metal which is lustrous
Name: a Metal Which is a Poor Conductor of Electricity.
Name: the Hardest Naturally Occurring Substance
Give two examples of Noble gases.
State the number of atoms of each element, present in \[\ce{HNO3}\].
Also name the compound.
Find the atomicity of the Following molecule:
Calcium Chloride
Fill in the blank
A metal which is a poor conductor of electricity is _______.
Indicate whether the following statement is true or false:
Molecules can exist independently.
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
Tick (√) the correct alternative from the choice given for the following statement.
Gold is used to make jewellery because
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
Write the names of elements from the following symbol:
Br
Select the correct answer from the choice given below to complete the sentence :
Dust in air is an example of _________ mixture.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
Classify the following as metals, non-metals and metalloids.
Sodium, Bismuth, Silver, Nitrogen, Silicon, Carbon, Chlorine, Iron, Copper
Differentiate between elements and compounds.
Reason out
Elements are called semimetals.
