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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.
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
Give two examples for the following: Metals
Name the substance you will add to speed up sedimentation.
Define a pure substance. How many types of pure substances do you know?
State the number of atoms of C6H12O6
Name: A form of carbon used as a gem
Indicate whether the following statement is true or false:
Metals reflect light and are good conductors of electricity
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
Match the compounds in List I – 1 to 20 with their correct formulas from in List II-A to T.
| List I | List II | ||
| 1 | Hydrochloric acid | A | NaCI |
| 2 | Potassium Hydroxide | B | NaOH |
| 3 | Sulphuric Acid | C | KCI |
| 4 | Zinc Hydroxide | D | Ca(OH)2 |
| 5 | Sodium Chloride | E | CaS |
| 6 | Nitric Acid | F | CuSO4 |
| 7 | Calcium Hydroxide | G | CaCO3 |
| 8 | Carbonic Acid | H | NH4CI |
| 9 | Sodium hydroxide | I | HCI |
| 10 | Copper sulphate | J | ZnO |
| 11 | Potassium Chloride | K | HNO3 |
| 12 | Calcium Carbonate | L | H2CO3 |
| 13 | Magnesium Sulphide | M | MgS |
| 14 | Zinc Sulphate | N | MgO |
| 15 | aluminium Hydroxide | O | KOH |
| 16 | Sodium Carbonate | P | ZnSO4 |
| 17 | Calcium Sulphide | Q | Na2CO3 |
| 18 | Magnesium Oxide | R | H2SO4 |
| 19 | Zinc Oxide | S | AI(OH)3 |
| 20 | Ammonium Chloride | T | Zn(OH)2 |
Write the names of elements from the following symbol:
Si
Select the correct answer to the statement given below:
A compound containing carbon, oxygen and calcium.
Select the correct answer to the statement given below:
A metalloid
Give an example of two liquids which form homogenous.
Atoms: Fundamental particle of an element::______ : Fundamental particles of a compound.
Match the following.
| 1. | Element | Made up of molecules |
| 2. | Compound | Impure substance |
| 3. | Colloid | Settles down on standing |
| 4. | Suspension | Pure substance |
| 5. | Mixture | Made up of atoms |
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
Matter is its simplest form is called ______.
Complete the table by writing the symbols of the following elements
| Element | Symbol |
| Aluminum | Al |
| Nickel | |
| Bromine | |
| Helium | |
| Magnesium |
