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प्रश्न
Correct the following statement:
CO and Co both represents cobalt.
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उत्तर
CO is a Carbon monoxide and Co is an element named Cobalt.
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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 |
Name the technique that you use if only the solid component of a solution is required.
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Define the term: Element
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Vinegar
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
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Define Elements.
Give two examples of Metalloids.
How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.
Answer the following question:
Why are copper and aluminium used to make electric wires?
Fill in the blank
A metal which is a liquid at room temperature is _______.
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 |
Complete the statement given below by filling in the blanks with the correct words.
From the elements – He, Br, Pt, and O; the element which is metallic is ____, an inert element is ____, forms a triatomic molecule is ____, is liquid at room temperature is_ ___.
Write the names of elements from the following symbol:
Ir
Select the correct answer to the statement given below:
A compound containing carbon, oxygen and calcium.
Atoms: Fundamental particle of an element::______ : Fundamental particles of a compound.
Differentiate metals and non-metals.
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
