300+ TOP MCQs on s-Block Elements and Answers

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MCQs on s-Block Elements :

1. Which of the compounds is known as Slaked lime?
(A) CaO
(B) CaSO₄
(C) Ca(OH)₂
(D) CaCO₃

Answer

Answer: (c)

2. Which of the ions have maximum hydration energy?
(A) Sr²⁺
(B) Ca²⁺
(C) Mg²⁺
(D) Be²⁺

Answer

Answer: (d)

3. As compared to K, Na has
(A) higher ionization potential
(B) lower melting point
(C) lower electronegativity
(D) larger atomic radius

Answer

Answer: (a)

4. Which one is the most stable carbonate?
(A) BaCO₃
(B) MgCO₃
(C) CaCO₃
(D) BeCO₃

Answer

Answer: (a)

5. Plaster of Paris (POP) is
(A) CaSO₄ H₂O
(B) CaSO₄ 2H₂O
(C) CaSO₄
(D) CaSO₄ 1/2H₂O

Answer

Answer: (d)

6. Which oxide is amphoteric?
(A) BaO
(B) CaO
(C) BeO
(D) MgO

Answer

Answer: (c)

7. Be shows the diagonal relationship with
(A) Na
(B) Al
(C) Mg
(D) B

Answer

Answer: (b)

8. The tendency to lose their valance electron easily by alkali metals makes them
(A) strong reducing agent
(B) weak reducing agent
(C) strong oxidising agent
(D) weak oxidising agent

Answer

Answer: (a)

9. Which one is known as a fusion mixture?
(A) Na₂CO₃ + NaHCO₃
(B) Na₂CO₃ + NaOH
(C) Na₂CO₃ + K₂SO₄
(D) Na₂CO₃ + K₂CO₃

Answer

Answer: (d)

10. 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

Answer

Answer: (b)