2nd Year Chemistry S-Block Elements
MCQs Chapter No. 2
11. What is deposited at the cathode during the electrolysis of brine:
(a) Na
(b) H2
(c) Cl2
(d) OH
Answer:
(b) H2
12. Which of the following is a rare radioactive element:
(a) Fr
(b) Cs
(c) Ra
(d) Rb
Answer:
(c) Ra
13. The chemical formula of Magnesite is:
(a) MgCl2
(b) Mg (CI03)2
(c) MgCO3
(d) None of these
Answer:
(c) MgCO3
14. Which carbonate of alkali metals is insoluble in water:
(a) Na2Co3
(b) K2CO3
(c) Li2CO3
(d) Cs2CO3
Answer:
(c) Li2CO3
15. Ga has most common oxidation state of:
(a) +3
(b) +2
(c) +4
(d) +1
Answer:
(a) +3
