Important question paper

11th Standard

    Reg.No. :
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Chemistry

Time : 00:20:00 Hrs
Total Marks : 35

    Part-A

    Answer all the questions

    35 x 1 = 35
  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. The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

    (a)

    p-block elements

    (b)

    d-block elements

    (c)

    s-block elements

    (d)

    f-block elements

  3. How does electron affinity change when we move from left to right in a period in the periodic table?

    (a)

    Generally increases

    (b)

    Generally decreases

    (c)

    Remains unchanged

    (d)

    First increases and then decreases

  4. Which of the following pairs of elements exhibit diagonal relationship?

    (a)

    Be and Mg

    (b)

    Li and Mg

    (c)

    Be and B

    (d)

    Be and Al

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

    (a)

    Principal

    (b)

    Azimuthal

    (c)

    Magnetic

    (d)

    Spin

  6. The first list of 23 chemical elements was published by _____ in the year 1789.

    (a)

    Berzelius

    (b)

    Dobereiner

    (c)

    Lavoisier

    (d)

    John Dalton

  7. Which of the following statement (s) about the Modern Periodic Table is are incorrect
    i. The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
    ii. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
    iii. Isotopes are placed in adjoining group (s) in the Periodic Table.
    iv. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.

    (a)

    (i) only

    (b)

    (i), (ii) and (iii)

    (c)

    (i), (ii) and (iv)

    (d)

    (iv) only

  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. The electronic configuration of nitrogen is _____

    (a)

    Is22s22p3

    (b)

    Is22s2 2Px12py12P21

    (c)

    Is22s12p4

    (d)

    both (a) and (b)

  10. The first transition series is from _____ to _____

    (a)

    Sc to Zn

    (b)

    Hf to Hg

    (c)

    Y to Cd

    (d)

    Ac to Lr

  11. Modern periodic law is.

    (a)

    The physical and chemical properties of the elements are periodic functions of their atomic numbers.

    (b)

    The physical and chemical properties of the elements depend upon the energy of the electrons.

    (c)

    The physical and chemical properties of the elements depend upon atomic weight.

    (d)

    None of these

  12. Match the list I with list II and select the correct answer using the code given below the list.

    List I List II
    A Unnilbium 1 Bohrium
    B Unnil hexium 2 Ronigenium
    C unnnunium 3 scaborgium
    D Unnilsepluim 4 Nobelium
    (a)
    A B C D
    1 2 4 3
    (b)
    A B C D
    3 1 4 2
    (c)
    A B C D
    4 3 2 1
    (d)
    A B C D
    4 3 1 2
  13. The general electronic configuration of s-block element is ______

    (a)

    ns1

    (b)

    ns2

    (c)

    ns1 and ns2

    (d)

    ns1-2

  14. The p-block elements comprise of group

    (a)

    1,2

    (b)

    13 to 18

    (c)

    3 to 12

    (d)

    12 to 18

  15. The general electronic configuration of p-block element is _____

    (a)

    ns1-2

    (b)

    np1-6

    (c)

    np6

    (d)

    ns2 np6

  16. "The relative tendency of a bonded atom in a molecule to attract the shared pair of electrons towards itself" is termed as_____

    (a)

    electron gain enthalpy

    (b)

    electronegativity

    (c)

    electron affinity

    (d)

    ionisation energy

  17. Which of the following property has no unit?

    (a)

    ionisation energy

    (b)

    electronegativity

    (c)

    electron affinity

    (d)

    atomic radius

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

    List I List II
    A.Element with first highest
    ionization enthalpy
    1.Fluorine
    B.Element with second
    highest ionization enthalpy
    2.Chlorine
    C.Element with highest 
    electron gain enthalpy
    3.Sodium
    D.Element with highest
    electronegativity
    4.Neon
    (a)
    A B C D
    1 3 2 4
    (b)
    A B C D
    4 3 2 1
    (c)
    A B C D
    3 1 4 2
    (d)
    A B C D
    2 1 4 3
  19. The law of triads is not obeyed by______

    (a)

    Ca, Sr, Ba

    (b)

    CI, Br, I

    (c)

    Li, Na, K

    (d)

    Be, B, C

  20. According to modern periodic law, the physical and chemical properties of the elements are periodic functions of their_______

    (a)

    atomic volume

    (b)

    atomic numbers

    (c)

    atotnic weights

    (d)

    valency

  21. Which period contain 32 elements?

    (a)

    Period 1

    (b)

    Period 4

    (c)

    Period 5

    (d)

    Period 6

  22. Which one of the following is a metal?

    (a)

    N

    (b)

    Br

    (c)

    Bi

    (d)

    As

  23. Match the list-I and list-II using the correct code given below the list.

      List-I   List-II
    A. Alkali metal 1. ns2 np1-6
    B. Alkaline earth metals 2. ns1
    C. d-block elements 3. ns2
    D. p-block elements 4. (n-1)d1-10 ns0-2
    (a)
    A B C D
    2 3 4 1
    (b)
    A B C D
    3 4 2 1
    (c)
    A B C D
    4 2 3 1
    (d)
    A B C D
    1 4 2 3
  24. 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

  25. IUPAC name of \({ CH }_{ 3 }-\overset { \underset { | }{ H } }{ \underset { \overset { | }{ { C }_{ 2 }{ H }_{ 5 } } }{ C } } -\overset { \underset { | }{ { C }_{ 4 }{ H }_{ 9 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -{ CH }_{ 3 }\) is

    (a)

    3, 4, 4 – Trimethylheptane

    (b)

    2 – Ethyl –3, 3– dimethyl heptane

    (c)

    3, 4, 4 – Trimethyloctane

    (d)

    2 – Butyl -2 –methyl – 3 – ethyl-butane

  26. The IUPAC name of the compound \({ H }_{ 3 }C-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -CH=C{ \left( { CH }_{ 3 } \right) }_{ 2 }\) is

    (a)

    2,4,4 – Trimethylpent -2-ene

    (b)

    2,4,4 – Trimethylpent -3-ene

    (c)

    2,2,4 – Trimethylpent -3-ene

    (d)

    2,2,4 – Trimethylpent -2-ene

  27. The IUPAC name of the compound  is

    (a)

    3 – Ethyl -2– hexene

    (b)

    3 – Propyl -3– hexene

    (c)

    4 – Ethyl – 4 – hexene

    (d)

    3 – Propyl -2-hexene

  28. Ortho and para-nitro phenol can be separated by

    (a)

    azeotropic distillation

    (b)

    destructive distillation

    (c)

    steam distillation

    (d)

    cannot be separated

  29. The purity of an organic compound is determined by

    (a)

    Chromatography

    (b)

    Crystallisation

    (c)

    melting or boiling point

    (d)

    both (a) and (c)

  30. The name of C2F4Cl2 is ___________

    (a)

    Freon – 112

    (b)

    Freon – 113

    (c)

    Freon – 114

    (d)

    Freon – 115

  31. Which of the following reagent is helpful to differentiate ethylene dichloride and ethylidene chloride?

    (a)

    Zn / methanol

    (b)

    KOH / ethanol

    (c)

    aqueous KOH

    (d)

    ZnCl2 / Con HCl

  32. Match the compounds given in Column I with suitable items given in Column II

     Column I
      (Compound)  
      Column II  
    (Uses)
     A. Iodoform  1. Fire extinguisher   
     B. Carbontetra chloride       2. Insecticide
     C. CFC  3. Antiseptic
     D. DDT  4. Refrigerants
    (a)

    A → 2 B → 4 C →1 D →3

    (b)

    A → 3 B → 2 C → 4 D → 1

    (c)

    A → 1 B → 2 C →3 D → 4

    (d)

    A → 3 B → 1 C →4 D → 2

  33. Which one of the following is most reactive towards nucleophilic substitution reaction?

    (a)

    (b)

    (c)

    (d)

  34. Ethylidene chloride on treatment with aqueous KOH gives

    (a)

    acetaldehyde

    (b)

    ehtyleneglycol

    (c)

    formaldehyde

    (d)

    glycoxal

  35. The raw material for Rasching process

    (a)

    chloro benzene

    (b)

    phenol

    (c)

    benzene

    (d)

    anisole

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