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प्रश्न
What is meant by 2H and H2
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उत्तर
2H is two atoms of hydrogen. H2 is one molecule of hydrogen gas
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संबंधित प्रश्न
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 |
Give two examples of the following.
Elements which are liquids
Mention three gaseous elements and write their molecular formulae
Indicate whether the following statement is true or false:
A compound is made up of just one kind of atom
Indicate whether the following statement is true or false:
All elements are artificially prepared
Select the correct answer from the choice in the bracket.
The positively charged particle of an atom.
The first letter of an element is always written in ______ letter.
An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
What is the Latin name of Sodium?
