S-Block Elements MCQs

The first two groups of elements are referred to as s-Block elements. These elements have their last valence electron in the s orbital. Elements with a single electron in their outermost s orbital (ns^1) are called alkali metals, while those with two electrons in their outermost s orbital (ns^2) are known as alkaline earth metals.

Alkali metals: H, Li, Na, K, Rb, Cs, Fr

Alkaline earth metals: Be, Mg, Ca, Sr, Ba, Ra

Be shows the diagonal relationship with

(a) Na
(b) Al
(c) Mg
(d) B

Which of the compounds is known as Slaked lime?

(a) CaO
(b) CaSO₄
(c) Ca(OH)₂
(d) CaCO₃

Which oxide is amphoteric?

(a) BaO
(b) CaO
(c) BeO
(d) MgO

Plaster of Paris (POP) is

(a) CaSO₄ H₂O
(b) CaSO₄ 2H₂O
(c) CaSO₄
(d) CaSO₄ 1/2H₂O

The tendency to lose their valence electron easily by alkali metals makes them

(a) strong reducing agent
(b) weak reducing agent
(c) strong oxidising agent
(d) weak oxidising agent

Which of the ions have maximum hydration energy?

(a) Sr₂⁺
(b) Ca₂⁺
(c) Mg₂⁺
(d) Be₂⁺

Find the incorrect trend for alkaline earth metals

(a) atomic size Be < Mg < Ca < Sr
(b) second ionization energy Be < Mg < Ca < Sr
(c) Hydration enthalpy Sr < Ca < Mg < Be
(d) Density Ca < Mg < Be < Sr

Which one is the most stable carbonate?

(a) BaCO₃
(b) MgCO₃
(c) CaCO₃
(d) BeCO₃

Which one is known as a fusion mixture?

(a) Na₂CO₃+ NaHCO₃
(b) Na₂CO₃+ NaOH
(c) Na₂CO₃+ K₂SO₄
(d) Na₂CO₃+ K₂CO₃

As compared to K, Na has

(a) higher ionization potential
(b) lower melting point
(c) lower electronegativity
(d) larger atomic radius