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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 NanCOn+1 + KnCOn+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.
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