Download ICSE/ISC Chemistry Important Question Papers with solution - X
Important Question 2009
Chemistry - X
Q.1. Element X is a metal with a valence 2. Element Y is a non-metal with a valence 3.
(i) Writ equations to show how X and Y form ions.
(ii) If Y is a diatomic gas, write the equations for the direct combination of X and Y to form a compound.
Q.2. (i) What must be added to sodium chloride to obtain hydrogen chloride. Write the equation for the reaction.
(ii) Write the equation for the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
Q.3. (i) Write an equation for solutions of ammonium chloride and sodium hydroxide are heated.
(ii) Ammonium salts decompose on heating. What other property do ammonium salts have in common?
(iii) Choose the correct word from the bracket and write a balanced equation for the same : Heating ammonium chloride with sodium hydroxide produces ______ [ammonia / nitrogen].
(iv) Name [formula is not acceptable] the gas produced on warming ammonium sulphate with sodium hydroxide solution.
(v) Write the equation for the preparation of NH3 from ammonium chloride and calcium hydroxide.
(vi) Write the equation for the reaction when a mixture of ammonium chloride and slaked lime is heated.
(vii) From the list of substances given – Ammonium sulphate, Lead carbonate, Chlorine, Copper nitrate, Ferrous sulphate – State : A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride.
Q.4. Write a balanced equation for the reaction of nitrogen monoxide and oxygen.
Q .5. (i) Give equations for the following conversions:
(a) Sulphur dioxide to Sulphur (b) Sulphur dioxide to sodium sulphite
(c) sodium sulphite to Sulphur dioxide.
(ii) (a)Write the equation for the laboratory preparation of Sulphur dioxide from sodium sulphite.
(b) How is the SO2 collected?
(c) What does the method of collection tell you about the density of SO2?
(d) What do you see when SO2 is bubbled through an acidified K2Cr2O7 solution?
(iii) Write one equation in each case to show the action of Sulphur dioxide as:
(a) a reducing agent (b) an oxidizing agent (c) an acid anhydride.
(iv) When burning Sulphur [i.e. SO2] reacts with H2O, a compound is formed. Name the compound.
(v) Give the balanced equation for reaction between SO2 and moist Cl2.
(vi) Write a balanced equation for: SO2 and sodium hydroxide solution. [formation of normal salt].
(vii) What type of substance will liberate Sulphur dioxide from sodium sulphite.
(viii) Write the equation for the reaction by which Sulphur dioxide is converted into sodium sulphite.
Q.6. (i) Define the term ‘catenation’.
(ii) Which one of the elements – Li, Be, B, C, O, F, Ne shows the property of catenation.
Q.7. An electrode ‘A’ is connected to the positive terminal of a battery and electrode ‘B’ to the negative terminal.
(i) Give the names of the electrodes A & B.
(ii) Which electrode is the oxidizing electrode.
Q.8. 2H2O ? 2H2 (g) + O2 (g).
If a given experiment results in 2500 cm3 of H2 being produced, what volume of O2 is liberated at the same time under the same conditions of temperature and pressure.
Q.9. (i) State the term for:- Compounds having the same general formula and similar chemical properties.
(ii) Name (a) The compound with – OH and with – COOH as the part of its structure.
(b) Homologue of homologus series with general formula CnH2n from the compounds given: Ethane, Ethene, Ethanoic acid, Ethyne, Ethanol.
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