Integer Answer Type Questions for JEE: The s-Block Element | Chapter-wise Tests for JEE Main & Advanced PDF Download

Q.1. A mixture containing 2.0 mol each of H₂ and O₂ is ignited so that water is formed. The amount of water formed is

Ans. 36.0 g
2H₂ + O₂ → 2H₂O
The moles of H₂ require one mole of O₂ to give two moles of 36 g water. Here H₂ is the limiting reactant.

Q.2. Valency electrons in alkali metals are

Ans. 1
Alkali metals valence shell configuration = ns¹ 

Q.3. Fusion mixture is Na_nCO_n+1 + K_nCO_n+1.  what is n. 

Ans. 2
Fusion mixture is Na₂CO₃ + K₂CO₃.

Q.4. The maximum covalency of Be is 

Ans. 4
Be = [He] 2S² 2P⁰ 

Q.5. Among BeCO₃, CaCO₃, SrCO₃ 
How many no. of these compounds are thermally more stable than MgCO₃   

Ans. 2
BeCO₃ < MgCO₃ < CaCO₃ < SrCO₃ depends upon ionic character.

Q.6. Number of molecules of water of crystallization in MgCl₂ is  

Ans. 6
Mg has a high charge density and also has empty d orbitals. This allows it to accommodate 6 water molecules in its hydration sphere.

Q.7. 6 m mols of pure gypsum is heated to convert it completely to plaster of paris. What is the number of m mols of steam evolved in the process

Ans. 9

Q.8. The maximum covalency of Be is 

Ans. 4
Be = [He] 2S² 2P°  

Q.9. Among BeCO₃, CaCO₃, SrCO₃ 
How many no. of these compounds are thermally more stable than MgCO₃ 

Ans. 2
BeCO₃ < MgCO₃ < CaCO₃ < SrCO₃ depends upon ionic character.

Q.10. The Hydration energy of alkaline eather metal ions is higher than that of alkali metal ions. So MgCl₂. XH₂O and CaCl₂. XH₂O can exist. What is the value of X ? 

Ans. 6
MgC1₂.6H₂O & CaCl₂.6H₂O can exist.