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S-Block Elements Test - 12

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S-Block Elements Test - 12
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  • Question 1
    1 / -0

    Sodium and potassium belong to the category of

    Solution

    Na and K have ns1 configuration so they are alkali metal.

  • Question 2
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    What is the oxidation state of K in KO2?

    Solution

    Here KO2 is in superoxide form hence O.S. of O is -1/2 for each oxygen atom. Hence 2*1/2= 1, therefore k has +1 O.S.

  • Question 3
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    Potassium ions are the most abundant cations. They:

    Solution

    Potassium ions are the most abundant cations. They participate in the oxidation of glucose to produce ATP

  • Question 4
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    Metal carbonates decompose on heating to give metal oxide and carbondioxide. Which of the metal carbonates is most stable thermally?

    Solution

    BaCO3 is very stable due to size compatability factor . A larger cation can stablises a larger anion.

  • Question 5
    1 / -0

    Dehydration of hydrates of halides of calcium, barium and strontium i.e.,   can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?

    Solution

    All of these statements are coorect as these halides absorb water and due to decrease in the hydration energy down the group tendency to from hydrates decreases.

  • Question 6
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    One of the following is highly radioactive

    Solution

    Fr is radioactive.

  • Question 7
    1 / -0

    2M +2H2O → 2M+ + 2OH- + H2   

    What is M ?

    Solution

    M is alkali metal.

  • Question 8
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    To acquire noble gas configuration, alkaline earth metals lose

    Solution

    Alkaline Earth Metals loses 2 electron to attain noble gas configuration.

  • Question 9
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    The diagonal relationship exists between

    Solution

    1st element of 1st group and the second element of 2nd group exist in diagonal relationship.

    Hence C is the correct answer.

  • Question 10
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    Choose the correct statements from the following.

    Solution

    The correct answer is Option B
    Be is not readily attacked by acids due to formation of oxide layer.
    The surface of beryllium metal is covered with a thin layer of oxide that helps protect the metal from attack by air. It does not oxidize in air even at 600oC. 
    2Be+O2⟶2BeO

  • Question 11
    1 / -0

    Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? 

    Solution

    While moving from left to right in periodic table basic character of oxide of elements will decrease. ∴→Increasing basic strength Al2O32O    and while descending in the group basic character of corresponding oxides increases.  ∴→Increasing basic strength Na2O2O   ∴ Correct Order is Al2O3 < MgO 2O 2O

  • Question 12
    1 / -0

    Lithium has most negative E0 value,its reaction with water is less vigorous than that of sodium which has the least negative E0 value among the alkali metals. The reason is

    Solution

    Li due its small size have high Lattice energy value which compensates its high ionization energy so has most negative E0 value

  • Question 13
    1 / -0

    Alkaline earth metals show large size of the atoms. Therefore, they have

    Solution

    The low ionisation enthalpies of the alkaline earth metals is because of their strong tendency to lose electrons due to their smaller nuclear charge and comparatively larger atomic size which results in weaker forces of attraction between the valence electrons and the nucleus.

  • Question 14
    1 / -0

    Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?

    Solution

    Due to small size of Mg. Mg-O become more stronger hence tendency of OH to leave decreases thus basic character decreases.

  • Question 15
    1 / -0

    Several sodium compounds find use in industries. Which of the following ompounds are used for textile industry?

    Solution

    Na2CO3 is used in textile industry.

  • Question 16
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    Monovalent sodium and potassium ions found in large proportions in biological fluids. They help in

    Solution

    Na and K ions help in transmission of nerve impulses.

  • Question 17
    1 / -0

    When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to

    Solution

    The color of solution is due to the presence of ammoniated electron.

  • Question 18
    1 / -0

    Choose the correct order of increase in electropositivity of alkali earth metals in the options given below

    Solution

    Correct Answer : a

    Explanation : Atomic no. of Be, Mg, Ca, Sr, Ba are 4, 12,20,38,56 respectively.

    On moving down the group, the effective nuclear charge on the outermost electrons decreases. Hence Ba can readily lose electrons and will be the most electropositive element among the alkaline earth metals.

  • Question 19
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    Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is

    Solution

    BeCl2 is soluble in ethanol. Except for beryllium halides, all other halides of alkaline earth metals are ionic in nature. Beryllium halides are essentially covalent and soluble in organic solvents.

  • Question 20
    1 / -0

    Which of the following compounds are readily soluble in water?

    Solution

    BeSO4 being unstable is readily soluble in water. Aslo hydration energy of Be is high due to small size.

  • Question 21
    1 / -0

    Divalent magnesium and calcium ions are found in large proportions in biological fluids.

    Solution

    Mg2+ and Ca2+ maintains the ion balance.

  • Question 22
    1 / -0

    The alkali metals dissolve in liquid ammonia giving deep blue solutions. When they become diamagnetic, the solution turns into

    Solution

    When the solution become diamagnetic color changes to bronze.

  • Question 23
    1 / -0

    Radium salts are used in

    Solution

    Ra salts are used in the treatment of Cancer.

  • Question 24
    1 / -0

    The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,the lowest solubility of LiF in water is due to

    Solution

    LiF has very high lattice energy which cannot be compensated by Hydration Energy.

  • Question 25
    1 / -0

    Which of the following are the correct reasons for anomalous behaviour of lithium?

    Solution

    Exceptionally small size of Li is responsible for its anamolous behavior.

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