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प्रश्न
What elements do the following compounds contain ?
Sugar, Common salt
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उत्तर
Formula of sugar is C12H22O11 . So, the elements present in sugar are carbon (C), hydrogen (H) and oxygen (O).
Formula of sodium chloride is NaCl. So, the elements present in sodium chloride are sodium (Na) and chlorine (Cl).
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संबंधित प्रश्न
Define the following term of Matter .
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
How would you confirm that a colourless liquid given to your is pure water ?
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
Choose the correct answer.
A 15% alcohol solution means :
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Define Sol and give one example.
What is a suspension ? Give two examples of suspensions.
Name the process which can be used to recover salt from an aqueous salt solution.
Name the process which is used in milk dairies to separate cream from milk.
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
How is cream separated from milk ?
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
Gases do not diffuse very easily.
