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11th Standard Chemistry Periodic Classification of Elements English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

    Answer all the questions

    20 x 1 = 20
  1. The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

    (a)

    AB

    (b)

    AB2

    (c)

    A2B

    (d)

    none of the above

  2. Period of an element is represented by _____ quantum number

    (a)

    Principal

    (b)

    Azimuthal

    (c)

    Magnetic

    (d)

    Spin

  3. Match the list I with List II and select the correct answer using. the code given below the lists.

    List I List II
    A Chancourtois 1 Addition of synthetic elements
    B Rang 2 Families and periods Long form
    C Glenn Seaborg 3 Modem periodic law
    D Moseley 4 First periodic law
    (a)
    A B C D
    1 3 2 4
    (b)
    A B C D
    4 2 1 3
    (c)
    A B C D
    3 4 1 2
    (d)
    A B C D
    2 1 4 3
  4. Which of the following is Dobereiner's triad?

    (a)

    Ne,Ca,Na

    (b)

    H2, N2, O2

    (c)

    Li, Na, K

    (d)

    Na, Br, K

  5. What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

    (a)

    AB

    (b)

    AB3

    (c)

    A3B

    (d)

    3AB3

  6. Law of triad was unable to explain for the element

    (a)

    Ca, Sr and Ba

    (b)

    Fe, Co, Ni

    (c)

    Li, Na, K

    (d)

    CI, Br, I

  7. The horizontal rows in the periodic table are called as ______

    (a)

    group

    (b)

    family

    (c)

    period

    (d)

    column

  8. Consider the following statements according to modern periodic table.
    (i) Modern periodic table contains 18 vertical columns and 7 horizontal rows.
    (ii) The elements after uranium are called transuranium elements
    (iii) The 17th group elements are called chalcogens
    (iv) The elements of Groups 13 to 18 are called p-block elements.
    which of the following statement(s) given above is/are correct.

    (a)

    (i), (iii) & (iv)

    (b)

    (i), (ii) & (iii)

    (c)

    (i), (ii) & (iv)

    (d)

    all the 4 statements

  9. There are _____ periods in the periodic table.

    (a)

    18

    (b)

    7

    (c)

    6

    (d)

    5

  10. The electronic configuration of nitrogen is _____

    (a)

    Is22s22p3

    (b)

    Is22s2 2Px12py12P21

    (c)

    Is22s12p4

    (d)

    both (a) and (b)

  11. The element with Z = 24 is placed in the _____ period

    (a)

    5

    (b)

    2

    (c)

    3

    (d)

    4

  12. The elements at the extreme left of periodic table has strong behaviour ______

    (a)

    Oxidizing

    (b)

    Reducing

    (c)

    both oxidisation and reducing

    (d)

    electro negative

  13. d-block elements form ____ compounds.

    (a)

    ionic

    (b)

    covalent

    (c)

    Coordinate

    (d)

    both (a) and (b)

  14. Which among the following has the highest ionisation energy

    (a)

    Ne

    (b)

    Na

    (c)

    K

    (d)

    Kr

  15. The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number 9, 17, 35 and 53 respectively is

    (a)

    I > Br > Cl > F

    (b)

    F > Cl > Br > I

    (c)

    Cl > F > Br > I

    (d)

    Br > I > Cl > F

  16. The element with positive electron gain enthalpy is

    (a)

    Hydrogen

    (b)

    Sodium

    (c)

    Argon

    (d)

    Fluorine

  17. Assertion: Helium has the highest value of ionisation energy among all the elements known
    Reason: Helium has the highest value of electron affinity among all the elements known

    (a)

    Both assertion and reason are true and reason is correct explanation for the assertion

    (b)

    Both assertion and reason are true but the reason is not the correct explanation for the assertion

    (c)

    Assertion is true and the reason is false

    (d)

    Both assertion and the reason are false

  18. Which of the following is second most electronegative element?

    (a)

    Chlorine

    (b)

    Fluorine

    (c)

    Oxygen

    (d)

    Sulphur

  19. In a given shell the order of screening effect is

    (a)

    s > p > d > f

    (b)

    s > p > f > d

    (c)

    f > d > p > s

    (d)

    f > p > s > d

  20. The First ionisation potential of Na, Mg and Si are 496, 737 and 786 kJ mol-1 respectively. The ionisation potential of Al will be closer to

    (a)

    760 kJ mol-1

    (b)

    575 kJ mol-1

    (c)

    801 kJ mol-1

    (d)

    419 kJ mol-1

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