ICSE Class 10

General instructions: Answer all questions. Marks are shown in brackets [ ].

Objective

1. 1.
   Identify the non-metal from the following that sublimes on heating.

   1. A. Sulphur
   2. B. Phosphorus
   3. C. Iodine
   4. D. Carbon
   [1]
2. 2.
   Which of the following correctly defines the term 'ionisation potential'?

   1. A. The energy released when an electron is added to a gaseous atom.
   2. B. The energy required to remove an electron from an isolated gaseous atom in its ground state.
   3. C. The tendency of an atom to attract shared electrons in a chemical bond.
   4. D. The energy needed to break a nucleus into its constituent protons and neutrons.
   [1]
3. 3.
   (ix) If an element has two electrons in its valence shell it is likely to be

   1. a. non-metal
   2. b. metal
   3. c. metalloid
   4. d. inert gas.
   [1]
4. 4.
   Greater is the ... difference, stronger is the bond formed.

   1. A. Electro-valency
   2. B. Electropositivity
   3. C. Electronegativity
   4. D. Electron Affinity
   [1]
5. 5.
   An element has atomic number 18. To which group and period of the periodic table does this element belong?

   1. A. Group 17, Period 3
   2. B. Group 18, Period 3
   3. C. Group 1, Period 4
   4. D. Group 16, Period 3
   [1]
6. 6.
   What is the term for the tendency of an atom to attract electrons to itself when combined in a compound?

   1. A. Electron affinity
   2. B. Ionization energy
   3. C. Electronegativity
   4. D. Valency
   [1]
7. 7.
   Salts of which elements are generally coloured:

   1. a. Inner-transition
   2. b. Normal
   3. c. Lanthanide's
   4. d. Transition
   [1]
8. 8.
   Which of the given elements A, B, C, D and E with atomic numbers 2, 3, 7, 10 and 30 respectively belong to the same period?

   1. A. B, C, D
   2. B. A, B, C
   3. C. A, D, E
   4. D. B, D, E
   [1]
9. 9.
   The tendency of an atom to attract shared pair of electrons to itself when combined in a compound is called ... along the period.

   1. A. electro-positivity
   2. B. electro-negativity
   3. C. inert
   4. D. none of the above
   [1]
10. 10.
    ... period is the longest period of the present periodic table.

    1. A. eighth
    2. B. sixth
    3. C. seventh
    4. D. second
    [1]
11. 11.
    Which of the following is NOT a periodic property?

    1. A. Atomic radius
    2. B. Ionisation energy
    3. C. Electron affinity
    4. D. Molar mass
    [1]
12. 12.
    Which element in the third period of the periodic table is the most electronegative?

    1. A. Sodium
    2. B. Magnesium
    3. C. Chlorine
    4. D. Argon
    [1]
13. 13.
    Elements of group 1 and elements of group 17 both have valency 1. Why?

    1. A. Group 1 elements lose 1 electron, while group 17 elements gain 1 electron to achieve stability.
    2. B. Both groups have 1 valence electron, which they share to form bonds.
    3. C. Group 1 elements gain 7 electrons, while group 17 elements lose 7 electrons to complete their octet.
    4. D. Both groups achieve valency 1 by losing 1 proton from their nucleus.
    [1]
14. 14.
    Assertion: Sodium is a highly electronegative element. Reason: Sodium has a tendency to lose electrons. Which of the following is correct?

    1. A. Both assertion and reason are true, and the reason is the correct explanation of the assertion.
    2. B. Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
    3. C. The assertion is true, but the reason is false.
    4. D. The assertion is false, but the reason is true.
    [1]
15. 15.
    Arrange the elements of the second and third periods in increasing order of their atomic size. Which of the following represents the correct arrangement?

    1. A. Second period: Li < Be < B < C < N < O; Third period: Na < Mg < Al < Si < P < S < Cl
    2. B. Second period: O < N < C < B < Be < Li; Third period: Cl < S < P < Si < Al < Mg < Na
    3. C. Second period: Li < O < N < C < B < Be; Third period: Na < Cl < S < P < Si < Al < Mg
    4. D. Second period: Be < B < C < N < O < Li; Third period: Mg < Al < Si < P < S < Cl < Na
    [1]
16. 16.
    What is valency, and how does its value vary when moving down a group and across a period in the periodic table?

    1. A. Valency is the combining capacity of an element; it remains constant in a group and first increases then decreases across a period.
    2. B. Valency is the number of protons in an atom; it increases both down a group and across a period.
    3. C. Valency is the total number of electrons; it decreases down a group and remains constant across a period.
    4. D. Valency is the atomic mass of an element; it varies unpredictably in a group and increases steadily across a period.
    [1]
17. 17.
    An element in period 2 whose electron affinity is zero:

    1. A. Carbon
    2. B. Neon
    3. C. Sodium
    4. D. Sulphur
    [1]
18. 18.
    Why is a cation always smaller than its parent atom, and an anion always larger?

    1. A. Cations lose electrons, increasing nuclear pull, while anions gain electrons, reducing nuclear pull and increasing repulsion.
    2. B. Cations gain protons, increasing nuclear charge, while anions lose protons, decreasing nuclear charge.
    3. C. Cations expand due to reduced electron repulsion, while anions shrink due to increased nuclear attraction.
    4. D. Cations and anions both change size due to neutron loss or gain, altering atomic mass.
    [1]
19. 19.
    The atomic radii of inert gases are larger than those of preceding elements due to ... in completely filled shells.

    1. A. high I.E.
    2. B. force of repulsion
    3. C. low I.E.
    4. D. force of attraction
    [1]
20. 20.
    Among the following, which are the bridge elements?

    1. a. C-Mg
    2. b. Be-B
    3. c. Be-Si
    4. d. Li-Mg
    [1]