s and p-Block Elements
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Questions and Answers

Which ion has the maximum degree of hydration among alkali metals?

  • Cs+
  • Li+ (correct)
  • Rb+
  • K+

    • What is the correct order of electronegativity of alkali metals from highest to lowest?

  • Li > Na > K > Rb > Cs
  • Na > Li > K > Rb > Cs
  • Cs > Rb > K > Na > Li
  • Li < Na < K < Rb < Cs (correct)

    • Which ion has the highest conduction power among alkali metals?

  • Cs+ (correct)
  • Li+
  • Na+
  • K+

    • What is the correct order of relative hydrated ionic radii of alkali metals?

    <p>Li+ &lt; Na+ &lt; K+ &lt; Rb+ &lt; Cs+</p> Signup and view all the answers

    Which of the following statements is true about alkali metals?

    <p>Metallic character and electro positivity increase from Li to Cs</p> Signup and view all the answers

    What is the primary reason for the higher values of heat of hydration for divalent cations of alkaline earth metals?

    <p>Their tendency to form stable compounds with high lattice energy</p> Signup and view all the answers

    Which of the following alkaline earth metals has the highest standard oxidation potential?

    <p>Be</p> Signup and view all the answers

    What is the characteristic of the oxides formed by Ba and Ra when burnt in air?

    <p>Peroxide in nature</p> Signup and view all the answers

    What is the trend in the hydration energies of M ions with increase in ionic radii?

    <p>Decreases</p> Signup and view all the answers

    Which of the following alkaline earth metals is not a powerful reducing agent?

    <p>Be</p> Signup and view all the answers

    What is the primary reason why the alkali metal salts are colourless and diamagnetic?

    <p>Because of their ns configuration with no unpaired electrons</p> Signup and view all the answers

    What is the correct order of increasing atomic radius of alkali metals?

    <p>Li &lt; Na &lt; K &lt; Rb &lt; Cs &lt; Fr</p> Signup and view all the answers

    What is the correct statement about the hydration of alkali metal ions?

    <p>Smaller the cation, greater is the degree of hydration</p> Signup and view all the answers

    What is the correct explanation for the lustre of freshly cut alkali metals?

    <p>Due to the surface oxidation of the metal</p> Signup and view all the answers

    What is the correct expression for the hydration energy of an alkali metal ion?

    <p>M (g) → M+ (aq) ; ΔH = -ve</p> Signup and view all the answers

    What is the trend in the density of alkali metals down the group?

    <p>It increases gradually</p> Signup and view all the answers

    Why is potassium lighter than sodium despite being below it in the periodic table?

    <p>Due to its unusually large atomic size</p> Signup and view all the answers

    What is the crystal lattice structure of alkali metals in their solid state?

    <p>Body-centred cubic lattice</p> Signup and view all the answers

    What is the reason for the low melting and boiling points of alkali metals compared to other group members?

    <p>Due to their low ionisation energy values</p> Signup and view all the answers

    Why do alkali metals exhibit strong electropositive character?

    <p>Due to their low ionisation energy values</p> Signup and view all the answers

    What is the primary reason for the anomalous behavior of boron trifluoride, regarding its Lewis acid character?

    <p>The fluorine atom's tendency to back-donate its unutilised electrons to the vacant p orbitals of boron atom.</p> Signup and view all the answers

    Which of the following boron trihalides has the highest Lewis acid character?

    <p>BI</p> Signup and view all the answers

    What is the reason behind the efficient Lewis acid nature of boron halides?

    <p>Their ability to accept a pair of electrons from a donor molecule to complete their octet.</p> Signup and view all the answers

    Which of the following metals exhibits a characteristic similar to Al and Ga in terms of forming a protective film of oxides?

    <p>Thallium in HCl</p> Signup and view all the answers

    What is the primary use of BF3 due to its Lewis acid nature?

    <p>As a catalyst in organic reactions.</p> Signup and view all the answers

    What is the reason why alkaline earth metals form divalent ions instead of univalent ions?

    <p>Due to the higher degree of hydration of their divalent ions</p> Signup and view all the answers

    What is the effect of hydration on the energy of alkaline earth metal ions?

    <p>It decreases the energy of the ion</p> Signup and view all the answers

    Why do alkaline earth metals tend to exist as divalent cations in solution?

    <p>Due to the strong lattice structure of their divalent ions</p> Signup and view all the answers

    What is the reason why alkaline earth metals do not form univalent ions despite having low ionisation energy?

    <p>Due to the higher degree of hydration of their divalent ions</p> Signup and view all the answers

    What is the benefit of hydration in the formation of divalent ions of alkaline earth metals?

    <p>It compensates for the higher value of second ionisation energy</p> Signup and view all the answers

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