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JEE Main Chemistry · s-Block Elements · Set 1 (Q1-30)

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  1. 1.
    Which of the following metals exist in liquid state during summer season?
    1. (1)Ga
    2. (2)Al
    3. (3)Pb
    4. (4)Sn
  2. 2.
    The element playing significant role in neuromuscular function and interneuronal transmission is :
    1. (1)Be
    2. (2)Ca
    3. (3)Li
    4. (4)Mg
  3. 3.
    The hybridisations of -orbitals in and respectively are
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  4. 4.
    The chemical nature of hydrogen peroxide is :
    1. (1)Oxidising agent in acidic medium, but not in basic medium.
    2. (2)Oxidising and reducing agent in both acidic and basic medium.
    3. (3)Reducing agent in basic medium, but not in acidic medium.
    4. (4)Oxidising and reducing agent in acidic medium, but not in basic medium.
  5. 5.
    Assertion : Alkali metals and their salts impart characteristic flame colours.
    Reason (R): Alkali metals have low ionization enthalpy values. So, electron excitation is possible.The correct option among the following is
    1. (1) and are true but is the correct explanation for (A)
    2. (2)(A) and (R) are true. (R) is not the correct explanation for (A)
    3. (3) is true but (R) is false
    4. (4) is false, but (R) is true
  6. 6.
    When aluminium chloride is dissolved in water, it gives
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  7. 7.
    The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are :
    1. (1) and
    2. (2)Cl– and ClO–
    3. (3)Cl– and
    4. (4)ClO– and
  8. 8.
    Two metals and having similar ionic radii, react with oxygen to give only monoxides and react with nitrogen to give nitrides. Then, and respectively are
    1. (1)Li and Na
    2. (2)Na and Ca
    3. (3)Li and Mg
    4. (4)Na and Be
  9. 9.
    Given below are two statementsAssertion (A): The enthalpy of formation of graphite is taken as zero.Reason (R): Graphite is thermodynamically most stable allotrope of carbonThe correct answer is
    1. (1)Both (A) and (R) are correct and (R) is the correct explanation of
    2. (2)Both and are correct but is not the correct explanation of
    3. (3)
    4. (4)
  10. 10.
    , reacts with water to form and forms when it reacts with iodine in basic medium. What are and respectively?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  11. 11.
    Statement I: Boron does not exhibit allotropy
    Statement II: Boron is extremely hard and black coloured solid
    1. (1)Both I & II are correct
    2. (2)Both I & II are not correct
    3. (3) is correct but II is not correct
    4. (4)I is not correct but II is correct
  12. 12.
    When is reacted with under aqueous condition the product formed is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  13. 13.
    Which one of the following statements is not correct?
    1. (1)The hydration enthalpies of alkali metal ions decrease down the group.
    2. (2)Lithium halides are some what covalent in nature.
    3. (3)Alkali metals react with water liberating oxygen gas.
    4. (4) is paramagnetic.
  14. 14.
    Match the following:

    The correct answer is
    A B C D
    1. (1)IV III I II
    2. (2)III IV I II
    3. (3)III I IV II
    4. (4)IV III II I
  15. 15.
    The correct statements from the below:
    1.Charcoal can be obtained on heating wood in absence of air.
    2.Charcoal is impure form of graphite.
    3.Diamond is thermodynamically the most stable allotrope of carbon.
    4.Coke is used as an oxidising agent during the extraction of iron-from its ores.
    1. (1)1 and 3
    2. (2)2 and 4
    3. (3)1 and 4
    4. (4)1 and 2
  16. 16.
    Assertion (A): In group 15 elements nitrogen does not form pentahalidesReason (R): Nitrogen can exhibit +5 oxidation state The correct option among the following is
    1. (1)(A) and (R) are true. (R) is the correct explanation of (A)
    2. (2)(A) and (R) are true, but ( ) is not correct explanation of (A)
    3. (3)(A) is true but (R) is false
    4. (4)(A) is false but (R) is true
  17. 17.
    The products obtained during treatment of hard water using Clark's method are:
    1. (1) and
    2. (2)Ca and Mg
    3. (3) and Mg
    4. (4)Ca and
  18. 18.
    Which of the following statements are correct ?
    (A) Both LiCl and are soluble in ethanol.
    (B) The oxides O and MgO combine with excess of oxygen to give superoxide.
    (C) LiF is less soluble in water than other alkali metal fluorides.
    (D) O is more soluble in water than other alkali metal oxides.
    Choose the most appropriate answer from the options given below:
    1. (1)(A) and (C) only
    2. (2)(A), (C) and (D) only
    3. (3)(B) and (C) only
    4. (4)(C) and (D) only
  19. 19.
    Assertion (A) : HCl gas is dried by passing through concentrated .
    Reason (R) : HCl gas reacts with that gives white fumes
    1. (1)Both (A) and (R) are correct and (R) is the correct explanation of
    2. (2)Both (A) and (R) are correct and (R) is not the correct explanation of
    3. (3)
    4. (4)
  20. 20.
    The pair(s) of reagents that yield paramagnetic species is/are
    1. (1)Na and excess of
    2. (2)K and excess of
    3. (3)Cu and dilute
    4. (4) and 2-ethylanthraquinol
  21. 21.
    When is dissolved in water, ions are
    1. (1)hydrated
    2. (2)hydrolysed
    3. (3)reduced
    4. (4)oxidised.
  22. 22.
    Which of the following statements regarding sulphur is not correct?
    1. (1)At about , it mainly consists of molecules
    2. (2)The oxidation state of sulphur is never less than +4 in its compounds
    3. (3) molecule is paramagnetic
    4. (4)Rhombic sulphur is readily soluble in
  23. 23.
    Xenon reacts with fluorine at and 7 bar to form . In this reaction, the ratio of xenon and fluorine required is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  24. 24.
    What are the products of auto-photolysis of water?
    1. (1) and
    2. (2)
    3. (3)and
    4. (4)
  25. 25.
    aq. (excess) and are
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  26. 26.
    Assertion (A): Hydrogen fluoride has higher boiling point than other hydrogen halides.
    Reason (R): Hydrogen fluoride exhibits strong hydrogen bonding.The correct option among the following is
    1. (1)(A) is true, (R) is true and (R) is the correct explanation for (A)
    2. (2)(A) is true, (R) is true but (R) is not the correct explanation for (A)
    3. (3)(A) is true but (R) is false
    4. (4)(A) is false but (R) is true
  27. 27.
    Which of the following does not form double salts?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  28. 28.
    Which one of the following is used as refrigerant for ice cream and frozen foods?
    1. (1)
    2. (2)Liquid
    3. (3)
    4. (4)Liquid
  29. 29.
    When borax is dissolved in water, it gives an alkaline solution. The alkaline solution consists the following products
    1. (1)NaOH and
    2. (2)NaOH and
    3. (3) and
    4. (4) and
  30. 30.
    What is the nature of the bonding in anhydrous and hydrated respectively?
    1. (1)Ionic and ionic
    2. (2)Ionic and covalent
    3. (3)Covalent and ionic
    4. (4)Covalent and covalent