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प्रश्न
Write the names of elements from the following symbol:
Zn
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उत्तर
Zn- Zinc
संबंधित प्रश्न
Fill in the blank
A pure substance has definite.................. and constant ..............
Fill in the blank
Use of a ................. to separate the components of a mixture of solids is based on the difference in the size of the components
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Sand
Mention three gaseous elements and write their molecular formulae
Answer the following question:
Give the advantages of using symbols instead of names of elements or compounds.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
Complete the statement given below by filling in the blanks with the correct words.
Atom contains ________ , with positively charged _____.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
Complete the table:
| Element | Latin Name | Symbol |
| Mercury | ______ | Hg |
| Lead | Plumbum | ______ |
| Iron | ______ | Fe |
| Potassium | Kalium | ______ |
