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प्रश्न
Give a reason for the following statement :
Brass & bronze are examples of mixtures, while copper sulphate & lead nitrate are examples of compounds.
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उत्तर
Brass and bronze are mixtures as the composition of elements are not fixed by mass and has no formula.
Lead nitrate and copper sulphate are compounds as they have a fixed ratio of elements by mass and have a formula like Pb[NO3]2 and CuSO4.
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संबंधित प्रश्न
Give Two Examples for Each of the Following: Inert Gases
Define: Molecule
Answer the following question:
Why are copper and aluminium used to make electric wires?
Tick (√) the correct alternative from the choice given for the following statement.
All pure substances have
Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of
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 |
Select the correct answer to the statement given below:
A metalloid
With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
Elements are the______ form of pure substances.
The first letter of an element is always written in ______ letter.
