Your cart is empty.
Practice each question, then open the answer or worked solution.
Metallic elements are described by their standard electrode potential, fusion
enthalpy, atomic size, etc. The alkali metals are characterised by which of the
following properties?
(i) High boiling point
(ii) High negative standard electrode potential
(iii) High density
(iv) Large atomic size
Option (ii) and (iv) are the answers.
Several sodium compounds find use in industries. Which of the following
compounds are used for textile industry?
(i) Na2CO3
(ii) NaHCO3
(iii) NaOH
(iv) NaCl
Option (i) and (iii) are the answers.
Which of the following compounds are readily soluble in water?
(i) BeSO4
(ii) MgSO4
(iii) BaSO4
(iv) SrSO4
Option (i) and (ii) are the answers.
When Zeolite, which is hydrated sodium aluminium silicate is treated with
hard water, the sodium ions are exchanged with which of the following ion(s)?
(i) H+ ions
(ii) Mg2+ ions
(iii) Ca2+ ions
(iv) SO42- ionsSolution:
Option (ii) and (iii) are the answers.
Solution coming soon.
Identify the correct formula of halides of alkaline earth metals from the following.
(i) BaCl2.2H2O
(ii) BaCl2.4H2O
(iii) CaCl2.6H2O
(iv) SrCl2.4H2O
Option (i) and (iii) are the answers.
Choose the correct statements from the following.
(i) Beryllium is not readily attacked by acids because of the presence of
an oxide film on the surface of the metal.
(ii) Beryllium sulphate is readily soluble in water as the greater hydration
enthalpy of Be2+ overcomes the lattice enthalpy factor.
(iii) Beryllium exhibits coordination number more than four.
(iv) Beryllium oxide is purely acidic.
Option (i) and (ii) are the answers.
Which of the following are the correct reasons for the anomalous behaviour of lithium?
(i) The exceptionally small size of its atom
(ii) Its high polarising power
(iii) It has a high degree of hydration
(iv) Exceptionally low ionisation enthalpy
Option (i) and (ii) are the answers.
III. Short Answer Type
How do you account for the strong reducing power of lithium in aqueous
solution?
Lithium has the highest negative EӨ value, which is –3.04V. Lithium has a small atomic size, the highest ionization enthalpy but it is compensated by its high hydration enthalpy. Due to this, the reducing power of lithium is highest in an aqueous solution.
When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.
Lithium forms monoxide, sodium forms peroxide, and potassium form superoxide.
Complete the following reactions
(i) O2-2 + H2O →
(ii) O-2 + H2O →
(i) O2-2 + 2H2O → H2O2 + 2OH-
(ii) O2– + 2H2O → H2O2 + O2 + 2OH-