The s-Block Elements - Online Test
Q1. Choose the correct order of decrease in hydration enthalpies of alkaline earth metals in the options given below
Answer : Option C
Explaination / Solution:
As the size increases due to increase in ionic radii , hydration energy decreases.
Q2. Why does the solubility of alkaline earth metal carbonates and sulphates in water decrease down the group?
Answer : Option C
Explaination / Solution:
Solubility of sulphates and carbonates decreases down the group because of decrease in hydration energy. which is insufficient to over come the lattice energy of ions.
Q3. Calcium oxide is prepared on a commercial scale by using
Answer : Option C
Explaination / Solution:
Lime stone and rotary kiln is used in prepation of CaO.
Q4. Heating a pulverised mixture of limestone and clay in a rotary kiln is used in the manufacture of:
Answer : Option D
Explaination / Solution:
Heating a pulverised mixture of limestone and clay in a rotary kiln is used in the manufacture of Portland cement
Q5. Cement is an industrially important compound of
Answer : Option B
Explaination / Solution:
Cement is the important compound of Calcium.
Q6. The alkali metals are low melting. Which of the following alkali metal is expected? to melt if the room temperature rises to
Answer : Option C
Explaination / Solution:
Cs has very low melting point ()
Q7. Alkali metals react with water vigorously to form hydroxides and dihydrogen.Which of the following alkali metals reacts with water least vigorously?
Answer : Option C
Explaination / Solution:
Li reacts with water least vigorously, since the density of Li is only about half that of water,so it floats on the surface and ultimately dissappears,giving off H2 gas
Q8. The reducing power of a metal depends on various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.
Answer : Option A
Explaination / Solution:
High hydration energy of Li makes it’s a very good reducing agent. Its hydration energy compensates the high ionization energy.
Q9. Metal carbonates decompose on heating to give metal oxide and carbondioxide. Which of the metal carbonates is most stable thermally?
Answer : Option D
Explaination / Solution:
is very stable due to size compatibility factor . A larger cation can stablise a larger anion.Group 2 element become more thermally stable down the group.
Q10. The diagonal relationship exists between
Answer : Option A
Explaination / Solution:
element of group and the second element of group exist in diagonal relationship.Due to their nearly same polarizing power
