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प्रश्न
How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.
उत्तर
Sodium is a metal that is stored in kerosene oil, as it reacts very fast with air and water. Chlorine is a reactive greenish-yellow gas that is poisonous. When these two elements combine chemically, they form common salt sodium chloride, which is a non-poisonous, colourless, solid substance that we use in our food to add taste and to obtain some nutrition.
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संबंधित प्रश्न
Differentiate between the following.
Filter Paper and Alum
Name: a Metal Which is a Poor Conductor of Electricity.
Indicate whether the following statement is true or false:
Molecules combine to form atoms
Complete the statement – an element is a pure substance made up of ____________ atoms.
Give the name of the radical - CO3
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:
Cd
Give three differences between elements & compounds with relevant examples.
The first letter of an element is always written in ______ letter.
______ is the life-giving element is the air.
