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प्रश्न
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name - a poisonous gas almost as heavy as air.
उत्तर
A poisonous gas almost as heavy as air is Carbon monoxide
संबंधित प्रश्न
Fill in the blank
A pure substance has definite.................. and constant ..............
What is the difference between a pure substance and a mixture ?
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Sand
Name: a non-metal which is lustrous
Give two examples of the following.
Elements which are liquids
State the number of atoms of H2SO4
State the number of atoms of each element, present in \[\ce{HNO3}\].
Also name the compound.
State four differences between – elements, compounds and mixtures with suitable examples.
Match the following.
| 1. | Element | Made up of molecules |
| 2. | Compound | Impure substance |
| 3. | Colloid | Settles down on standing |
| 4. | Suspension | Pure substance |
| 5. | Mixture | Made up of atoms |
