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Atoms and Molec...

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  • Question 1
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    Match the following with the correct response:

    (1) PCl5  (A) Dinitrogen tetraoxide
    (2) N2O5 (B) Phosphorous pentachloride
    (3) N2O4 (C) Carbon tetrachloride
    (4) CCl4 (D) Dinitrogen pentaoxide

  • Question 2
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    Match the following with the correct response:

    (1) 1 mole of O2 (A) 6.022 × 1023 molecules
    (2) 1 mole of N (B) 12 g
    (3) 1 mole of C (C) 6.022 × 1023 atoms
    (4) 1 mole of H2O (D) 18 g

  • Question 3
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    Which is not true about H2SO4?

    (a) It is composed of 2 Hydrogen, 1 Sulphur and 4 Oxygen atoms.
    (b) It relative molecular mass is 98.
    (c) It is composed of one molecule of H2, one atom of S and two molecules of O2
    (d) Its relative molecular mass is 108.

  • Question 4
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    Which of the following is the correct definition of a mole?

    (a) It is equal to the gram atomic mass of the substance.
    (b) It contains 6.022×1020 atoms of a given substance.
    (c) It is equal to gram molecular mass of the substance.
    (d) It contains 6.022×1023 molecules of a given substance.

  • Question 5
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    Which of the following is/are incorrect chemical formula of the given compound?

    (a) Zinc Phosphate - Zn3(PO4)2
    (b) Ferric carbonate - Fe3(CO3)2
    (c) Calcium Phosphate - Ca3PO4
    (d) Sodium Sulphide-Na2S

  • Question 6
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    Identify the correct statement:

  • Question 7
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    Which of the two statements is/are true?

    Statement A : Positive ion migrates towards the cathode on passing electric current.
    Statement B : Some of the atoms of the elements have fractional mass.

  • Question 8
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    Match the following with the correct response:

    (1) Ions (A) Negatively charged
    (2) Anions (B) Polyatomic ion
    (3) Cations (C) Positively charged
    (4) Radical (D) Charged particles

  • Question 9
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    Match the following with correct response:

    (1) A dozen of pencil (A) Mole
    (2) Avogadro constant (B) 12
    (3) Unit used for calculation of amount of chemical substances (C) Carbon-12
    (4) Reference atom (D) 6.022×1023

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