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प्रश्न
How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.
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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
Classify the following substances into compounds and mixtures:
What is the difference between a pure substance and a mixture ?
Match the Columns:
| Column A | Column B | ||
| (a) | Metals | (i) | Non-Reactive |
| (b) | Molecules | (ii) | Brittle |
| (c) | Non-Metals | (iii) | Lustrous |
| (d) | Noble Gases | (iv) | Smallest unit of Compound |
Tick (√) the correct alternative from the choice given for the following statement.
Gold is used to make jewellery because
Tick (√) the correct alternative from the choice given for the following statement
A gaseous non-metal.
Give the name of the radical - OH
Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.
Select the correct answer to the statement given below:
The chemical name for dinitrogen oxide [N20].
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
Higher Order Thinking Skills.
List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.
