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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
Define mixture.
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Give Two Examples for Each of the Following: Metalloids
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
Give two examples of Metals.
Give two examples of Metalloids.
Indicate whether the following statement is true or false:
Noble gases are high reactive
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.
The compound used as common salt is
Tick (√) the correct alternative from the choice given for the following statement
A non-metal which is a good conductor of electricity.
Give the name of the radical - CO3
Select the correct answer from the choice given below.
The type of molecule- bromine
Write an answer to the following question in your own words.
Which elements (metals and non-metals), compounds and mixtures do we use in our day-to-day life?
‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
Differentiate metals and non-metals.
Matter is its simplest form is called ______.
______ is the life-giving element is the air.
Name the element which is used in toothpaste to strengthen our teeth.
