Advertisements
Advertisements
प्रश्न
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Advertisements
उत्तर
Mercury, iron, diamond, nitrogen, graphite, hydrogen, oxygen, and chlorine are elements because these cannot be split further into two or more simpler substances.
APPEARS IN
संबंधित प्रश्न
Define matter.
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
Which one of the following is not a metalloid ?
The property/properties which enable copper metal to be used for making electric wires is/are :
What happens when the temperature of a saturated sugar solution is increased ?
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
In what respects does a true solution differ from a colloidal solution ?
How will you differentiate between a suspension and a colloid ?
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Wipe the board with a duster and then tap the duster against the table. What do you see?
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
 |
 |
 |
The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
Solid is an arrangement of particles ______.
Atoms are tiny particles that repel each other when they are squeezed very close.
