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प्रश्न
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
उत्तर
(i) Chlorine – greenish-yellow
(ii) Nitrogen dioxide – reddish brown.
संबंधित प्रश्न
Name: the Hardest Naturally Occurring Substance
Answer the following question:
Give the advantages of using symbols instead of names of elements or compounds.
Find the atomicity of the Following molecule:
Acetic Acid
Fill in the blank
A diatomic gaseous element is _______.
Indicate whether the following statement is true or false:
Molecules can exist independently.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Define the terms elements, compounds & mixtures with a view to show their basic difference.
Select the correct answer from A, B, C, D & E for the statement given below :
A non-metal that is lustrous.
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
How are elements classified?
