Chemistry 2015 Solved Paper Previous Year Question ICSE

Chemistry 2015 Solved Paper Previous Year Question 

Chemistry 2015 Solved Paper Previous Year Question ICSE with Sample Paper for 2020 and Other Previous Year Solved Question for practice so that student of Class 10th ICSE can achieve their goals in next exam of council. Sample paper for Chemistry for 2020 exam also given . Hence by better practice and Solved Question Paper of Previous Year including 2015 is very helpful for ICSE student. By the practice of Chemistry 2015 Solved Question Paper ICSE Previous Year you can get the idea of solving. Try Also other year except Chemistry 2015 Solved Question Paper ICSE Previous Year for practice. Because only Chemistry 2015 Solved Question Paper ICSE Previous Year is not enough for preparation of council exam.

Chemistry 2015 Solved Paper Previous Year Question

(Two Hours)


Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent in reading the Question Paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section I is compulsory. Attempt any four questions from Section II.
The intended marks for questions or parts of questions are given in brackets [ ].

Previous Year Solved Question Paper Chemistry 2015 

SECTION-I  (40 Marks)

(Attempt all questions from this Section)

Question 1:
(a) Select from the list the gas that matches the description given in each case:
[ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne]

  1. This gas is used as a reducing agent in reducing copper oxide to copper.
  2. This gas produces dense white fumes with ammonia gas.
  3. This gas is used for welding purposes.
  4. This gas is also a saturated hydrocarbon.
  5. This gas has a characteristic rotten egg smell. [5]

(b) Choose the most appropriate answer for each of the following:

    1. Among the elements given below, the element with the least electronegativity is:
      (A) Lithium       (B) Carbon
      (C) Boron           (D) Fluorine
    2. Identify the statement which does not describe the property of alkenes:
      (A) They are unsaturated hydrocarbons
      (B) They decolourise bromine water
      (C) They can undergo addition as well as substitution reactions
      (D) They undergo combustion with oxygen forming carbon dioxide and water
    3. This is not an alloy of copper:                                                                                                           (A) Brass        (B) Bronze                                                                                                                 (C) Solder       (D) Duralumin
    4. Bonding in this molecule can be understood to involve coordinate bonding.                                (A) Carbon tetrachloride      (B) Hydrogen                                                                                      (C) Hydrogen chloride          (D) Ammonium chloride
    5. Which of the following would weigh the least?                                                                             (A) 2 gram atoms of Nitrogen.                                                                                                         (B) 1 mole of Silver                                                                                                                       (C) 22.4 litres of oxygen gas at 1 atmospheric pressure and 273 K.                                               (D) 6.02 x 1023 atoms of carbon.                                                                                              [Atomic masses: Ag = 108, N = 14, O = 16, C = 12]           [5]

(c) Complete the following calculations. Show working for complete credit:
(i) Calculate the mass of Calcium that will contain the same number of atoms as are present in 3.2 gm of Sulphur.
[Atomic masses: S = 32, Ca = 40] [2]
(ii) If 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas. [2]
(iii) If the empirical formula of a compound is CH and it has a vapour density of 13, find the molecular formula of the compound. [1]
(d) State one relevant observation for each of the following:

  1. When crystals of copper nitrate are heated in a test tube.
  2. When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.
  3. When hydrogen sulphide gas is passed through lead acetate solution.
  4. When ammonia gas is burnt in an atmosphere of excess oxygen.
  5. At the Anode when aqueous copper sulphate solution is electrolysed using copper electrodes. [5]

(e) Identify the acid which matches the following description (i) to (v):

  1. The acid which is used in the preparation of a non-volatile acid.
  2. The acid which produces sugar charcoal from sugar.
  3. The acid which is prepared by catalytic oxidation of ammonia.
  4. The acid on mixing with lead nitrate solution produces a white precipitate which is insoluble even on heating.
  5. The acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide. [5]

(f) Give appropriate scientific reasons for the following statements:

    1. Zinc oxide can be reduced to zinc by using carbon monoxide, but aluminium oxide cannot be reduced by a reducing agent.
    2. Carbon tetrachloride does not conduct electricity.
    3. During electrolysis of molten lead bromide graphite anode is preferred to other electrodes.
    4. The electrical conductivity of acetic acid is less in comparison to the electrical conductivity of dilute sulphuric acid at a given concentration
    5.  Electrolysis of molten lead bromide is considered to be a redox reaction. [5]

(g) (i) Give balanced chemical equations for the following conversions A, B and C: [3]
(ii) Differentiate between the terms strong electrolyte and weak electrolyte. (stating any two differences) [2]

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