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ICSE-X-Chemistry

Previous Year Paper year:2010

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  • #
    Board Paper 2010
    ICSE Board
    Class X Chemistry
    Board Paper - 2010
    Time: 1.5 hrs Total Marks: 80
    General Instructions:
    1. Answers to this paper must be written on the paper provided separately.
    2. 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 t h i s paper is the time allowed for writing the
    answers.
    This question paper is divided into two sections.
    3. Section I contains one question with parts (a) to (h); all the eight parts are to be
    answered.
    4. Section II contains six questions numbered 2 to 7. You are to answer any four of these
    questions.
    The intended marks of questions or for parts of questions are given in brackets [ ].
  • # [40]
    Section : I
    Attempt all questions from this section.
  • #1
  • #1-a [5]
    From the list given below, select the word(s) required to correctly
    complete the blanks (i) to (v) in the passage:
    [Note: Words chosen from the following list are to be used only once. Write only the
    answers. Do not copy the passage.]
    (Reddish, brown, ammonium, nitrogen dioxide, hydroxyl, dirty green, ammonia, acidic,
    alkaline)
    Nitrogen and hydrogen combine in the presence of a catalyst to give (i) _________
    gas. When the above mentioned gas is passed through water, it forms a solution which
    will be (ii) ____________ in nature, and the solution contains (iii) ______________ ions and
    (iv.) ____________ ions. The above solution when added to iron (II) sulphate solution gives
    a (v) ____________ coloured precipitate of iron (II) hydroxide.
    Ans :
    (i) Ammonia
    (ii) Alkaline
    (iii) Ammonium
    (iv) Hydroxyl
    (v) Dirty green.
  • #1-b [5]
    Select from the list given (A to E) one substance in each case which matches the
    description given in parts (i) to (v) (Note: Each substance is used only once in the
    answer.)
    (A) Nitroso iron (II) sulphate
    (B) Iron (III) chloride
    (C) Chromium sulphate
    (D) Lead (II) chloride
    (E) Sodium chloride
  • #1-b-i
    i. A compound which is deliquescent.
    Ans : (B) Iron(III) chloride
  • #1-b-ii
    ii. A compound which is insoluble in cold water but soluble in hot water.
    Ans : (D) Lead(II) chloride
  • #1-b-iii
    iii. The compound responsible for the brown ring during the brown ring test of
    nitrate ion.
    Ans : (A) Nitroso Iron(II) sulphate
  • #1-b-iv
    iv. A compound whose aqueous solution is neutral in nature.
    Ans : (E) Sodium chloride
  • #1-b-v
    v. The compound which is responsible for the green colouration when sulphur
    dioxide is passed through acidified potassium dichromate solution.
  • #1-c [5]
    For part (c) (i).(x), select the correct answer from the choices A, B, C and D which are
    given.
    Write only the letter corresponding to the correct answer.
  • #1-c-i
    i. A particular solution contains molecules and ions of the solute, so it is a
    (A) Weak acid
    (B) Strong acid
    (C) Strong base
    (D) Salt solution
    Ans : (A)
  • #1-c-ii
    ii. A compound which liberates reddish brown gas around the anode during
    electrolysis in its molten state is
    (A) Sodium chloride
    (B) Copper (II) oxide
    (C) Copper (II) sulphate
    (D) Lead (II) bromide
    Ans : (D)
  • #1-c-iii
    iii. An organic compound undergoes addition reactions and gives a red colour
    precipitate with ammoniacal cuprous chloride. Therefore, the organic compound
    could be
    (A) Ethane
    (B) Ethene
    (C) Ethyne
    (D) Ethanol
    Ans : (C)
  • #1-c-iv
    iv. An organic weak acid is
    (A) Formic acid
    (B) Sulphuric acid
    (C) Nitric acid
    (D) Hydrochloric acid
    Ans : (A)
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