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ICSE-X-Chemistry

Previous Year Paper year:2016

with Solutions -
 
  • #
    ICSE Board
    Class X Chemistry
    Time: 2 hrs Max. Marks: 80
    Answers to this Paper must be written on the paper provided separately.
    You will not be allowed 10 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 [ ]
  • # [40]
    Section : I
    Attempt all questions from this Section
  • #1
    Ans : 1.
  • #1-a [5]
    Fill in the blanks with the choices given in brackets.
  • #1-a-i
    Metals are good _____________ (oxidizing agents / reducing agents) because they
    are electron __________ (acceptors / donors).
    Ans : Metals are good reducing agents because they are electron donors.
  • #1-a-ii
    Electrovalent compounds have ________________ (high / low) melting points.
    Ans : Electrovalent compounds have high melting points.
  • #1-a-iii
    Higher the pH value of a solution, the more ____________ (acidic / alkaline) it is.
    Ans : Higher the pH value of solution, the more alkaline it is.
  • #1-a-iv
    _____________ (``\ce{AgCl / PbCl2}``), a white precipitate is soluble in excess ``\ce{NH4OH}``.
    Ans : AgCl, a white precipitate, is soluble in excess NH4OH.
  • #1-a-v
    Conversion of ethane to ethane is an example of ____________ (hydration /
    hydrogenation).
    Ans : Conversion of ethene to ethane is an example of hydrogenation.
  • #1-b [5]
    Choose the correct answer from the options given below :
  • #1-b-i
    An element with the atomic number 19 will most likely combine
    chemically with the element whose atomic number is :
    (A) 17
    (B) 11
    (C) 18
    (D) 20
    Ans : (A) 17
    Element with atomic number 19 will lose 1 electron to achieve the
    noble gas configuration which can be accepted by element with atomic
    number 17.
  • #1-b-ii
    The ratio between the number of molecules in 2g of hydrogen and 32g of
    oxygen is :
    (A) 1 : 2
    (B) 1:0.01
    (C) 1:1
    (D) 0.01:1 [Given that H = 1, O = 16]
    Ans : (C) 1:1
    Explanation:
    Moecular weight of Hydrogen(``H_2``) = 2g and that for the oxygen(``O_2``) = 32 g.
    Per Avogardro theory , 1 mole of moecules of any element contain same number of moecules
    (``\pu{6.023E23}``) hence ratio is 1:1
  • #1-b-iii
    The two main metals in Bronze are:
    (A) Copper and zinc
    (B) Copper and lead
    (C) Copper and nickel
    (D) Copper and tin
    Ans : (D) Copper and tin
    Bronze is an alloy which consists of copper and tin.
  • #1-b-iv
    The particles present in strong electrolytes are :
    (A) Only molecules
    (B) Mainly ions
    (C) Ions and molecules
    (D) Only atoms
    Ans : (B) mainly ions
    Strong electrolytes dissociate into ions.
  • #1-b-v
    The aim of the Fountain experiment is to prove that :
    (A) ``{\ce{HCl} }`` turns blue litmus red
    (B) ``{\ce{HCl}}`` is denser than air
    (C) ``{\ce{HCl} }`` is highly soluble in water
    (D) ``{\ce{HCl} }`` fumes in moist air
    Ans : (C) HCl is highly soluble in water.
    HCl is highly soluble in water. Its high solubility may be demonstrated
    by the fountain experiment.
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