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ICSE-X-Chemistry

Previous Year Paper year:2019

with Solutions -
 
  • #
    Answers to this Paper must be written on the paper provided separately.
  • You will not be allowed to write during the first IS 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
    [ ].
  • #
    Section : I
    [40 Marks]

    (Attempt all questions from this Section)
  • #1
  • #1-a
    Choose the correct answer from the options given below:
    [5]
  • #1-a-i
    An electrolyte which completely dissociates into ions is :

    (A) Alcohol

    (B) Carbonic acid

    (C) Sucrose

    (D) Sodium hydroxide

    Ans : (D) Sodium hydroxide
  • #1-a-ii
    The most electronegative element from the following elements is :

    (A) Magnesium

    (B) Chlorine

    (C) Aluminium

    (D) Sulphur

    Ans : (B) Chlorine
  • #1-a-iii
    The reason for using Aluminium in the alloy duralumin is:

    (A) Aluminium is brittle

    (B) Aluminium gives strength

    (C) Aluminium brings lightness

    (D) Aluminium lowers melting point

    Ans : (C) Aluminium brings lightness
  • #1-a-iv
    The drying agent used to dry HCl gas is :

    (A) Cone. H2SO4

    (B) ZnO

    (C) Al2O3

    (D) CaO

    Ans : (A) Cone. H2SO4
  • #1-a-v
    A hydrocarbon which is a greenhouse gas is :

    (A) Acetylene

    (B) Ethylene

    (C) Ethane

    (D) Methane

    Ans : (D) Methane
  • #1-b
    Fill in the blanks with the choices given in brackets:
    [5]
  • #1-b-i
    Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of .................

    (dehydration / dehydrogenation / dehydrohalogenation)

    Ans : dehydration
  • #1-b-ii
    When sodium chloride is heated with concentrated sulphuric acid below 200°C, one of the products formed is ..................

    (sodium hydrogen sulphate / sodium sulphate / chlorine)

    Ans : sodium hydrogen sulphate
  • #1-b-iii
    Ammonia reacts with excess chlorine to form ....................

    (nitrogen / nitrogen trichloride / ammonium chloride)

    Ans : nitrogen trichioride
  • #1-b-iv
    Substitution reactions are characteristic reactions of .................

    (alkynes / alkenes / alkanes)

    Ans : alkanes
  • #1-b-v
    In Period 3, the most metallic element is .................

    (sodium / magnesium / aluminium)

    Ans : sodium
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