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P-1SOLUTIONSMATTER IN OUR SURROUNDINGS 1CHAPTERTOPIC-1Matter, Solid, Lquid, Gas; Characteristics of Solid, Liquid and GasWORKSHEET-11.Gaseous state. (CBSE Marking Scheme, 2012) 12.CNG, LPG. CBSE Marking Scheme, 2012) ½ + ½3.Solubility in water. (CBSE Marking Scheme, 2012) 14.Liquid. (CBSE Marking Scheme, 2012) 15.Aerosols are mixture of liquid or solid in gas. Examples : Fog, Mist, Smoke. (Any two) 1 + 16.(a)solids, particles are closely packed(b)solids, particles are closely packed.(CBSE Marking Scheme, 2015) 1 + 1Detailed Answer :(a)Solids have maximum force of attraction between the particles and are closely packed.(b)Solids have minimum spaces in between particles as the particles are closely packed.7.(i) Rate of diffusion : solid < liquid < gas.(ii)Particle motion :solid < liquid < gas(CBSE Marking Scheme, 2012)1 + 18.Water is liquid at room temperature as it takes the shape of the container in which it is put and it shows fluidity.(CBSE Marking Scheme, 2012) 1 + 19.(a)Particles of matter have space between them(b)Particles of matter are continuously moving(c)Particles of matter attract each other(CBSE Marking Scheme, 2014) 1 × 310.(a) Solids are incompressible because the particles are closely packed and there is no space for their movement.(b)The particles of solids do not have any intermolecular space and hence no movement. Therefore, they have negligible kinetic energy. 1½ + 1½11.Rubber band changes shape under force and regains the shape when the force is removed,so it is classified as a solid. 3WORKSHEET-21. Compressibility. (CBSE Marking Scheme, 2012) 12.No. (CBSE Marking Scheme, 2012) 13.Temperature and pressure.(CBSE Marking Scheme, 2012) ½ × 24.(a)Gas(b)Solid(c)Liquid(d)Solid(CBSE Marking Scheme, 2012) ½ × 45.Gases are more compressible due to weak forces of attraction between molecules of gases and more intermolecular spaces.(CBSE Marking Scheme, 2012) 1 + 16.In case of gaseous state, due to negligible force of attraction they can move freely. That is why rate of diffusion is faster in gases.(CBSE Marking Scheme, 2012) 2
P-2SCIENCEIX
38. (a) Naphthalene being volatile converts from solid to gas directly by the process called sublimation. Therefore, no solid residue is left after sometime as it takes the heat from surroundings and sublimes.(b)Particles of gas have negligible force of attraction between them and possess high kinetic energy. Therefore, they move very fast to fill the vessel completely in which they are kept. 1½ + 1½9.(a)(i) Gases and liquids do not have fixed shape.(ii)Gases and liquids flow easily.(or any other relevant points)(b)The shape does not change when pressed i.e.it is hard and rigid.It has a definite shape and has high density.(or any other relevant points)(c)The heat energy supplied is taken up by solid particles and helps in melting orfusion.(CBSE Marking Scheme, 2013) 2 + 2 + 1WORKSHEET-31.Water. (CBSE Marking Scheme, 2012) 1 2.Potassium permanganate, Copper sulphate.(CBSE Marking Scheme, 2012) ½ + ½3.Diffusion.

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