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11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Five

11th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25

    Answer all the questions

    25 x 1 = 25
  1. Atomicity of nitrogen is

    (a)

    1

    (b)

    2

    (c)

    3

    (d)

    Zero

  2. The maximum number of electrons in a sub shell is given by the expression

    (a)

     2n2

    (b)

    21+ I

    (c)

    41+ 2 

    (d)

    none of these

  3. Consider the following statements.
    (i) The region where the probability density of electron is zero, called nodal surface.
    (ii) The probability of finding the electron is independent of the direction of the nucleus.
    (iii) The number of radial nodes is equal to n + 1+ 1
    Which of the above statements is/are correct?

    (a)

    (i) and (iii)

    (b)

    (i) and (ii)

    (c)

    (iii) only

    (d)

    (i) and (iii)

  4. Pd has exceptional electronic configuration of 4d10 5s0 It belongs to period ______ and group _____

    (a)

    4, 11

    (b)

    5, 10

    (c)

    6, 9

    (d)

    3, 16

  5. Find the incorrect statement.

    (a)

    Smallest atom of periodic table is He

    (b)

    p-block elements are metals, nonmetals and metalloids

    (c)

    Noble gases have 8 valence electrons except He

    (d)

    Valence electron and valency is same for group I

  6. Which one of the following is the first transition series?

    (a)

    Sc

    (b)

    Zn

    (c)

    Ti

    (d)

    Cu

  7. Which one of the following is not an isoelectronic ion?

    (a)

    Na+

    (b)

    Mg2+

    (c)

    Cl-

    (d)

    O2-

  8. Among all the elements which one has the highest value of electronegativity?

    (a)

    Chlorine

    (b)

    Bromine

    (c)

    Fluorine

    (d)

    Iodine

  9. Which of the following is arranged in order of increasing radius?

    (a)

    K+ (aq) < Na+ (aq) < Li+ (aq)

    (b)

    K+ (aq) > Na+ (aq) > Zn+ (aq)

    (c)

    K+ (aq) > Li+ (aq) > Na+ (aq)

    (d)

    Li+ (aq) < Na+ (aq) < K+ (aq)

  10. The element with highest electron affinity belongs to___________.

    (a)

    period 1 group 1

    (b)

    period 3 group 17

    (c)

    period 2 group 17

    (d)

    period 2 group 16

  11. Deuterium consist of _____________

    (a)

    one electron, two proton, three neutron

    (b)

    one electron, one proton, one neutron

    (c)

    two electron, one proton, one neutron

    (d)

    three electron, two proton, one neutron

  12. The conversion of atomic hydrogen to dihydrogen is a __________ change.

    (a)

    endothermic

    (b)

    exothermic

    (c)

    photochemical

    (d)

    nuclear

  13. Match the list Iwith List IIand select the correct answer using. the code given below the lists.

    List I List II
    A H2O2 1 SiH4
    B D2O 2 PdH
    C Metallic hydride 3 Bleach
    D Molecular hydride 4 Study of reaction mechanism
    (a)
    A B C D
    1 3 2 4
    (b)
    A B C D
    4 3 1 2
    (c)
    A B C D
    3 4 2 1
    (d)
    A B C D
    2 1 4 3
  14. H2O2 is a ________ acid.

    (a)

    mono basic

    (b)

    di basic

    (c)

    tri basic

    (d)

    none

  15. Which of the following is used in illumination of wrist watches?

    (a)

    Phosphorous

    (b)

    Radon

    (c)

    Tritium

    (d)

    Deuterium

  16. Metallic hydrides are otherwise called-----------

    (a)

    Salt hydrides

    (b)

    Saline hydrides

    (c)

    molecular hydrides

    (d)

    Interstitial hydrides

  17. Change in internal energy, when 4 kJ of work is done on the system and 1 kJ of heat is given out by the system is

    (a)

    +1 kJ

    (b)

    - 5 kJ

    (c)

    +3 kJ

    (d)

    - 3 kJ

  18. Consider the reaction where KP = 0.5 at a particular temperature
    PCl5(g) ⇌ PCl3 (g) + Cl2 (g)
    if the three gases are mixed in a container so that the partial pressure of each gas is initially 1 atm, then which one of the following is true

    (a)

    more PCl3 will be produced

    (b)

    more Cl2 will be produced

    (c)

    more PCl5 will be produced

    (d)

    none of these

  19. The Henry's law constant for the solubility of Nitrogen gas in water at 350 K is 8 × 104 atm. The mole fraction of nitrogen in air is 0.5. The number of moles of Nitrogen from air dissolved in 10 moles of water at 350K and 4 atm pressure is

    (a)

    4 x 10-4

    (b)

    4 x 104

    (c)

    2 x 10-2

    (d)

    2.5 x 10-4

  20. Which of the following is electron deficient?

    (a)

    PH3

    (b)

    (CH3)2

    (c)

    BH3

    (d)

    NH3

  21. Non- Zero dipole moment is shown by

    (a)

    CO2

    (b)

    p-dichlorobenzene

    (c)

    carbontetrachloride

    (d)

    water

  22.  are

    (a)

    resonating structure

    (b)

    tautomers

    (c)

    Optical isomers

    (d)

    Conformers

  23. The geometrical shape of carbocation is

    (a)

    Linear

    (b)

    tetrahedral

    (c)

    Planar

    (d)

    Pyramidal

  24. Which of the following compounds will give racemic mixture on nucleophilic substitution by OH- ion?

    (a)

    (i)

    (b)

    (ii) and (iii)

    (c)

    (iii)

    (d)

    (i) and (ii)

  25. Haemoglobin of the blood forms carboxy haemoglobin with

    (a)

    Carbon dioxide

    (b)

    Carbon tetra chloride

    (c)

    Carbon monoxide

    (d)

    Carbonic acid

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