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Posted Date: 07 Mar 2009      Posted By:: Prasanta Borah    Member Level: Gold  Points: 5 (Rs. 1)

2008 ICSE ICSE Sample Papers : Chemistry : Class-IX Question paper

Course: SSLC   University/board: ICSE

Sample Paper – 2008
Class – IX
Subject – Chemistry

SECTION – I (40 Marks)

Note :- This section is compulsory. Answer all the question from this section.
Question – 1.
(a) Name a common substance which exists in all the three states of matter. Write its melting and boiling point.
(b) A fixed volume of a gas occupies 760 ml at 27 º C and 70 cm of Hg. What will be its volume at S.T.P. [Ans. 637 ml]
(c) Name a nonmetallic element which is :
(i) a liquid at ordinary temperatures, (ii) a conductor of electricity.
(d) The formula of the nitride of a metal X is XN, write the formula of its :
(i) sulphate (ii) hydroxide.
(e) State whether the following are oxidation or reduction :
(i) Fe++ ? Fe+++; (ii) Na ? Na+.
(f) Explain why silver nitrate crystals are dissolved in distilled water and not in tap water to prepare silver nitrate solution as a laboratory reagent.
(g) Ordinary chlorine gas has two isotopes : 35Cl17 and 37Cl17 in the ratio 3:1. Calculate the relative atomic mass [atomic weight] of chlorine. [Ans. 35.5]
(h) How many elements are there in period 2.
(i) Describe a test to distinguish between carbon monoxide and hydrogen.
(j) Phosphorus has several allotropes. Name two other elements which also has allotropes.
(k) Nitrogen can be obtained in the pure state by heating a mixture of ammonium chloride and a substance ‘X’. Name and write the molecular formula of the substance ‘X’.
(l) State any two industrial use of oxygen.
(m) Explain the term : ‘Vulcanization’.
(n) Describe the two colour changes which take place when moist blue litmus is placed in a gas jar of chlorine.
(o) Explain carbon cycle in nature.
(p) State why : ‘A blue flame is seen at the top of a coal fire’.
(q) State two uses of bleaching powder.
(r) State the effect of heat on Sulphur.
(s) State two differences between solid and liquid.
(t) Write the electronic configuration of Na and Cl.
SECTION – II (40 Marks)
Answer ANY FOUR questions from this section.
Question – 2.
(a) Explain the change of solid state of matter to the gaseous [vapour] state on the basis of kinetic theory of matter.
(b) State Boyle’s Law and Charle’s Law and combine the two laws to derive gas equation PV/T = K [constant].
(c) The pressure on one mole of gas at S T P is doubled and the temperature is raised to 546K. What is the final volume of the gas? [one mole of gas occupies a volume of 22.4 litres at S T P]. [Ans. 22.4 litres]
Question – 3.
(a)Differentiate between compound and mixture.
(b) Is air a mixture or a compound discuss.
(c) Write the valency of nitrogen in : (i) NO (ii) N2O (iii) NO2.
Question – 4.
(a) State the type of reaction that takes place in the following reactions :
(i) Cl2 + 2KI ? 2KCl + I2
(ii) 2Mg + O2 ? 2MgO
(iii) SO2 + 2H2O + Cl2 ? 2HCl + H2SO4
(iv) AgNO3 + HCl ? AgCl + HNO3
(v) 4HNO3 ? 4NO2 + 2H2O + O2.
(b) What is the effect of temperature of the solubility KNO3 and calcium sulphate in water.
Question – 5.
(a) Copy and complete the following table relating to the atomic structure of some elements :
Element Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons
Beryllium 4 9
Fluorine 9 10
Sodium 12 11
Aluminium 27 13
Phosphorus 31 15
(b) Name the elements of period 2 (two).
Question – 6.
(a) Place the metals : calcium, iron, magnesium and sodium in order of their activity with water, placing the most active first. Write the equation for each of the above metals which react with water.
(b) Give reason for : ‘Though ammonium nitrite readily gives nitrogen on heating, a mixture of ammonium chloride and sodium nitrite in water is heated to prepare nitrogen in the laboratory’.
(c) Name a gas which reduces hot copper (II) oxide to copper.
(d) How would you obtain oxygen from a mixture of ‘oxygen and ammonia’.
Question – 7.
(a) Describe how you would convert powdered roll Sulphur to (i) rhombic (ii) monoclinic sulphur.
(b) Complete and balance the following equations :
(i) 3Cl2 + KOH ? 5KCl + _______ + ________
(ii) KMnO4 + HCl ? ________ + _________ + ________ + 8H2O
(iii) 3CaOCl + 2NH3 ? _________ + _________ + N2[g]
(iv) 8NH3[excess] + 3Cl2 ? ________ + N2
(v) C10H16 + 8Cl2 ? 10C + __________ .
Question – 8.
(a) Give reason for : ‘It is dangerous to sleep in a closed room in which a coal fire is burning’.
(b) Give the name of an acid salt found in “Health Salts”.
(c) Starting from sodium hydroxide solution, how would you prepare sodium hydrogen carbonate (sodium bicarbonate). Write the appropriate equations.
(d) Name the anion present in the following compound [X] : ‘the action of heat on the insoluble compound X produces a gas which turns lime water turbid.’

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