s- Block Elements

s-Block Elements
Class:XI / Unit:10

1. Which of the compounds is known as Slaked lime?

CaO
Ca(OH)₂
CaSO₄
CaCO₃

2. Which of the ions have maximum hydration energy?

Sr²⁺
Ca²⁺
Mg²⁺
Be²⁺

3. As compared to K, Na has

higher ionization potential
lower melting point
lower electronegativity
larger atomic radius

4. Which one is the most stable carbonate?

BeCO₃
CaCO₃
MgCO₃
BaCO₃

5. Plaster of Paris (POP) is

CaSO₄. H₂O
CaSO₄ 2H₂O
CaSO₄ 1/2H₂O
CaSO₄

6. Which oxide is amphoteric?

BaO
CaO
MgO
BeO

7. The tendency to lose their valance electron easily by alkali metals makes them

weak oxidising agent
strong reducing agent
strong oxidising agent
weak reducing agent

8. Which one is known as a fusion mixture?

Na₂CO₃ + K₂SO₂
Na₂CO₃ + NaOH
Na₂CO₃ + K₂CO₃
Na₂CO₃ + NaHCO₃

9. Find the incorrect trend for alkaline earth metals

second ionization energy Be < Mg < Ca < Sr
Density Ca < Mg < Be < Sr
Hydration enthalpy Sr < Ca < Mg < Be
atomic size Be < Mg < Ca < Sr

10. Which of the following is not of s block elements

Ba
Rb
Po
Cs