1 mark Chemistry questions:
Ques: List two processes from which it may be concluded that the particles of a gas move continuously.
Ques: State Archimedes principle.
Ques: Identify the heterogeneous mixture from the following : Air, soda water, soap solution, brass.
Ques: What are the two components of a solution ?
Ques: Which one of the two solutions will scatter light sugar solution or soap solution ?
Ques: A body of weight 20 N floats half submerged in a liquid. What is the buoyant force on the body ?
Ques: Which one of the two solutions will scatter light sugar solution or soap solution ?
Ques: Name a metal that is liquid at room temperature.
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Ques: State four characteristics of Solids.
Ques: What is meant by a pure substance ?
2 mark Chemistry questions:
Ques: The concentration of a salt solution in terms of mass by mass percentage is 20% and the mass of the solution is 550 g. Determine the mass of solute present in the solution.
Ques: How is a chemical change different from a physical change ?
Ques: The concentration of a salt solution in terms of mass by mass percentage is 20% and the mass of the solution is 550 g. Determine the mass of solute present in the solution.
Ques: Give reasons for the following :
(a) Gases fill completely the vessel in which they are kept.
(b) Gases exert pressure on the walls of the containing vessel.
Ques: What is meant by : (i) free fall (ii) acceleration due to gravity ?
Ques: Which gas is called dry ice ? Why ?
Ques: (a) Convert 359 K to Celsius scale (°C).
(b) What is the value of boiling point of water on Kelvin scale of temperature ?
Ques: Mention in tabular form any two differences between heterogeneous and homogeneous mixtures.
Ques: Define the following :
(a) boiling point
(b) latent heat of fusion
(c) evaporation
Ques: Among the substances given below choose the element, mixture and compound.
(a) Air
(b) Lead
(c) Diamond
(d) Calcium Carbonate
3 marks Chemistry questions:
Ques: A gas jar containing air is placed upside down on a gas jar of bromine vapour. It is observed that after some time, the gas jar containing air also becomes completely reddish brown.
(a) Explain why this happens.
(b) Name the process involved.
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Ques: (a) Define element
(b) Identify non metals from the following elements. Carbon, Potassium, Silicon, Chlorine, Mercury
(c) In what way is a mixture different from a compound ?
Ques: Classify the following as physical or chemical changes :
(a) formation of cloud
(b) magnetising an iron bar
(c) burning of fuels
(d) digestion of food
Ques: (a) Convert the following to Celsius scale (i) 400 K (ii) 373 K.
(b) Convert the following to kelvin scale (i) 27°C (ii)70°C
(c) What does the melting point of a solid indicate ?
Ques: A cube of side 5cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to half and then immersed in water. What will be the effect on the buoyant force experienced by the cube as compared to the first case for water ? Give reason for each.
Ques: Elements are classified as metals, non metals and metalloids. Give any one property of each. Also give one examples of each
Ques: (a) How will you show the presence of water vapour in air ? (b) Give the full forms of (i) LPG (ii) CNG
5 marks questions:
Ques: Compare in tabular form properties of Solids, Liquids and Gases with respect to :
(i) Shape
(ii) Volume
(iii) Compressibility
(iv) Diffusion
(v) Fluidity or Rigidity
Ques: (i) What is meant by evaporation of a liquid ? Water kept in an earthen pot become cool during summer. Why?
(ii) With the help of a labelled diagram describe in brief an activity to show sublimation of ammonium chloride.
Ques: A gas jar containing air is placed upside down on a gas jar of bromine vapour. It is observed that after some time, the gas jar containing air also becomes completely reddish brown.
(a) Explain why this happens.
(b) Name the process involved.
Ques: (a) What separation technique will you apply for separation of the following ?
(i) Ammonium chloride from sodium chloride.
(ii) Different pigments from the extract of flower petals.
(b) What is crystallization ? List two ways in which crystallization technique is better than simple evaporation technique.
Ques: Compare in tabular form properties of Solids, Liquids and Gases with respect to : (i) Shape
(ii) Volume
(iii) Compressibility
(iv) Diffusion
(v) Fluidity or Rigidity
Ques: (i) What is meant by evaporation of a liquid ? Water kept in an earthen pot become cool during summer. Why?
(ii) With the help of a labelled diagram describe in brief an activity to show sublimation of ammonium chloride.
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Ques: (a) What is meant by crystallisation ? How is impure copper sulphate purified by the process ?
(b) What is fractional distillation ? How is it different from simple distillation ?
Ques: Show diagrammatically how water is purified in the waterworks system and list the processes involved.
Ques: Explain an activity with a neat labelled diagram for the separation of a mixture of ammonium chloride and sodium chloride.
Ques: How will you separate a mixture of two miscible liquids having difference in boiling points of more than 25°C. Describe with the help of a neat labelled diagram.
Ques: (a) What is distillation ? List the two conditions essential for using this as a method of separation of components of a mixture.
(b) Draw a labelled diagram of the apparatus used to separate a mixture of two miscible liquids.
Ques: Based on the following characteristics distinguish in tabular form the behaviour of true solution, suspension and colloidal solution.
(a) appearance
(b) visibility
(c) filterability
(d) tyndall effect
(e) particle size
Ques: Define distillation. What type of mixture can be separated by distillation ? Draw a labelled diagram of the apparatus used for fractional distillation.
Ques: What is osmosis ? What are its types ? What happens to a cell when it is placed in hypotonic, isotonic and hypertonic solutions respectively ? State two points of differences between osmosis and diffusion.
