The S Block Elements

MCQs:

 10.1. Lithium shows a diagonal relationship with
(a) sodium (b) silicon (c) nitrogen (d)magnesium

10.5. Assertion: Electrode potential is a measure of the tendency of an element to lose electrons in the aqueous solution. So, the reducing property can be correlated in terms ofelectrode potentials (E°) of alkali metals.

Reason: More positive is the electrode potential, higher is the tendency of the element to loose electrons and hence, stronger is the reducing agent.

10.4. Assertion: Alkali metals are always univalent.

Reason: Alkali metals are soft.

10.3. Assertion: The alkalimetals and their salts impart characteristiccolour to an oxidizing flame.

Reason: This heat from the flame excites the outermost orbitalelectron to a higher energy level. When the excitedelectron comes back to the ground state, thereis emission of radiation in the visible region ofthe spectrum.

10.2. Assertion: The ionization enthalpies of the alkali metalsare considerably high and increase down thegroup from Li to Cs.

Reason: The effectof increasing size outweighs the increasingnuclear charge, and the outermost electron isvery well screened from the nuclear charge.

Assertion and Reason:

Directions:

(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.

(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

(c) Assertion is correct statement but reason is wrong statement.

(d) Assertion is wrong statement but reason is correct statement.

10.1.Assertion: The elements of Group 2 are commonly known asthe alkaline earth metals.

Reason: Theiroxides and hydroxides are alkaline in nature and thesemetal oxides are found in the earth’s crust.

Assertion and Reason:

Directions:

(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.

(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

(c) Assertion is correct statement but reason is wrong statement.

(d) Assertion is wrong statement but reason is correct statement.

10.1.Assertion: The elements of Group 2 are commonly known asthe alkaline earth metals.

Reason: Theiroxides and hydroxides are alkaline in nature and thesemetal oxides are found in the earth’s crust.

10.32. Which one of the alkaline earth metal carbonates is thermally most stable?
(a) MgCO₃ (b) CaCO₃ (c) SrCO₃ (d) BaCO₃(Intermediate)

10.31. Which one of the following alkali metals gives hydrated salts?
(a) Li (b) Na (c) K (d) Cs (Intermediate)

10.30. Which of the alkali metal is having least melting point?
(a) Na (b) K (c) Rb (d) Cs