Give reasons:

a.Salt and sugar kept in different jars take the shape of the jars,yet they are classified as solid.

b.Solid have negligible compressibility yet sponge can compressed.

c.Gases exert pressure on the wall of the container

a. The shape of each individual sugar or salt crystal remains fixed, wether we take it in our hand, put it in a plate or in a jar.As we know solids don't change shape. That is why they are still considered solids.

b. A sponge has minute holes, in which air is trapped, when we press it, the air is expelled out and we are able to compress it.

c. In gaseous state, the particles move about radomly at high speed. Due to this random movement, the particles hit each other and also the walls of the container. The pressure exerted by the gas is because of this force exerted by the gas particles per unit area on the walls of the container.

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thanks for the answer

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Each and every particle is in particular shape and yet without any external force it remains in the particular shape and size 
 
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a. Salt and sugar are, in fact, solids. Each crystal retains its shape, regardless of where it is kept. It's only because of their small sizes, that they take the shape of the object they're placed into.

b. A sponge contains infinitesimal holes in which air is trapped. When a sponge is squeezed, or compressed, the air is expelled out, and it becomes possible to compress it.

c. In gases, particles move around randomly at very high speeds. Because of this movement, the particles are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, it exerts a small force on the wall. The pressure exerted by the gas is due to the sum of all these collision forces.The more particles that hit the walls, the higher the pressure exerted by the gas.

Sources:
I graduated the ninth grade :P + a lil socratic.org
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The state of the sugar or salt crystal don't change as they are little in size and when filling the container they likewise stay same as salt or sugar. Yet, in light of the fact that they are bigger in size, a few spaces can be seen between them. All in all state of badams continues as before. 
Both sugar and salt are initially the strong particles yet they are crystalline solids which have a customary and indistinguishable shape for every atom and they are extremely little in their size so they are arranged in a regular pattern and fill all the space of the holder so they appear like they have taken the state of the containwe
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. Salt and sugar are, in fact, solids. Each crystal retains its shape, regardless of where it is kept. It's only because of their small sizes, that they take the shape of the object they're placed into.

b. A sponge contains infinitesimal holes in which air is trapped. When a sponge is squeezed, or compressed, the air is expelled out, and it becomes possible to compress it.

c. In gases, particles move around randomly at very high speeds. Because of this movement, the particles are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, it exerts a small force on the wall. The pressure exerted by the gas is due to the sum of all these collision forces.The more particles that hit the walls, the higher the pressure exerted by the gas.

Sources:
I graduated the ninth grade :P + a lil socratic.org
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1.Sugar and salt are both solids. They take the shape of their respective jars as the individual crystals of each are small and many of these small sugar or salt crystals can fill up the empty spaces of a container.

2.Sponge is a solid state of matter yet it is compressible in nature. This is because of space/Inter particle space between the particles of sponge.So, the sponge can be compressed. Yet it is solid in nature because there is a force of attraction between the particles of sponge.
3.The pressure exerted by a gas is due to the random motion of particles in the gasGases have weak intermolecular forces and the particles in continuous random motion and these particles collide with the walls of the container
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