CBSE Class 9 Chemistry Question Paper SA1 2011 (4). Students can download the last year question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.
1.Why does the smell of hot cooked food reach you several metres away within second.
2.Apart from changing the magnitude of velocity of an object (or) changing the direction of motion of an object what other changes can force bring on an object ?
3.Name the process in which diffusion takes place through a selective permeable membrane.
4.Define a solution. Give an example of (i) gas in liquid solution (ii) gas in gas solution
5.(i) Arrange the following substances in increasing order of force of attraction between the particles. (a) water (b) hydrogen (c) sand (ii) Why does the temperature remain constant at the melting point ? (iii) Which property of gases makes it possible to fill large volume of gases in small cylinders.
6.(a) Differentiate between chemical and physical change ? (b) Give one example of each.
7.(a) A solution contains 20g of common salt in 120g of water. Calculate the concentration in terms of mass-by-mass percentage of the solution.
(b) Sudha tested the solubility of four salts A, B, C and D at different temperatures and collected the following data. (Solubility refers to the amount in grams dissolved in 100g of water to give a saturated solution.)
Answer the following questions from the table (i) Which salt has the highest and lowest solubility at 323K ?
(i) A student prepared a saturated solution of X at 323K and then added 25g water to it.
(ii) What mass of X must be added to again make the solution saturated ?
(iii) The solubility of which salt is least affected by increase in temperature ?(iv) What mass of ‘T’ would be required to make saturated solution in 200g of water at 290K ?
(a) List any four properties of a colloid and mention any two properties in which colloids differ from suspension. (b) State what is Tyndall effect ? Which of the following solutions will show Tyndall effect ? Starch solution, sodium chloride solution, Tincture iodine, air
21.Compare in tabular form , the properties of Solids, Liquids and Gases with respect to : (i) Shape (ii) Volume (iii) Compressibility (iv) Diffusion (v) Fluidity or Rigidity
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