30 Questions
Which ion has the maximum degree of hydration among alkali metals?
Li+
What is the correct order of electronegativity of alkali metals from highest to lowest?
Li < Na < K < Rb < Cs
Which ion has the highest conduction power among alkali metals?
Cs+
What is the correct order of relative hydrated ionic radii of alkali metals?
Li+ < Na+ < K+ < Rb+ < Cs+
Which of the following statements is true about alkali metals?
Metallic character and electro positivity increase from Li to Cs
What is the primary reason for the higher values of heat of hydration for divalent cations of alkaline earth metals?
Their tendency to form stable compounds with high lattice energy
Which of the following alkaline earth metals has the highest standard oxidation potential?
Be
What is the characteristic of the oxides formed by Ba and Ra when burnt in air?
Peroxide in nature
What is the trend in the hydration energies of M ions with increase in ionic radii?
Decreases
Which of the following alkaline earth metals is not a powerful reducing agent?
Be
What is the primary reason why the alkali metal salts are colourless and diamagnetic?
Because of their ns configuration with no unpaired electrons
What is the correct order of increasing atomic radius of alkali metals?
Li < Na < K < Rb < Cs < Fr
What is the correct statement about the hydration of alkali metal ions?
Smaller the cation, greater is the degree of hydration
What is the correct explanation for the lustre of freshly cut alkali metals?
Due to the surface oxidation of the metal
What is the correct expression for the hydration energy of an alkali metal ion?
M (g) → M+ (aq) ; ΔH = -ve
What is the trend in the density of alkali metals down the group?
It increases gradually
Why is potassium lighter than sodium despite being below it in the periodic table?
Due to its unusually large atomic size
What is the crystal lattice structure of alkali metals in their solid state?
Body-centred cubic lattice
What is the reason for the low melting and boiling points of alkali metals compared to other group members?
Due to their low ionisation energy values
Why do alkali metals exhibit strong electropositive character?
Due to their low ionisation energy values
What is the primary reason for the anomalous behavior of boron trifluoride, regarding its Lewis acid character?
The fluorine atom's tendency to back-donate its unutilised electrons to the vacant p orbitals of boron atom.
Which of the following boron trihalides has the highest Lewis acid character?
BI
What is the reason behind the efficient Lewis acid nature of boron halides?
Their ability to accept a pair of electrons from a donor molecule to complete their octet.
Which of the following metals exhibits a characteristic similar to Al and Ga in terms of forming a protective film of oxides?
Thallium in HCl
What is the primary use of BF3 due to its Lewis acid nature?
As a catalyst in organic reactions.
What is the reason why alkaline earth metals form divalent ions instead of univalent ions?
Due to the higher degree of hydration of their divalent ions
What is the effect of hydration on the energy of alkaline earth metal ions?
It decreases the energy of the ion
Why do alkaline earth metals tend to exist as divalent cations in solution?
Due to the strong lattice structure of their divalent ions
What is the reason why alkaline earth metals do not form univalent ions despite having low ionisation energy?
Due to the higher degree of hydration of their divalent ions
What is the benefit of hydration in the formation of divalent ions of alkaline earth metals?
It compensates for the higher value of second ionisation energy
This quiz covers the concept of hydration energy in alkali metals, including the order of hydration energy and its relation to the size of ions and their conductivity.
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