2nd Year Chemistry MCQs F.Sc. Part 2
Chapter No.3
Group III-A and IV-A Elements
Total MCQs = 38
6. When H3BO3 reacts with NaOH, salt mostly formed is (MTN 2015)
A. Na3BO3
B. Na2BO4O7
C. NaH2BO3
D. NaBO2
Answer:
B. Na2BO4O7
7. Which one is more stable? (FSD 2015)
A. H2BO3
B. HBO2
C. H2B4O7
D. H6B4O9
Answer:
C. H2B4O7
8. Orthoboric acid when heated to red hot gives (LHR 2014, 2016)
A. Boric Anhydride
B. Pyroboric acid
C. Metaboric acid
D. Tetraboric acid
Answer:
A. Boric Anhydride
9. Boric acid cannot be used: (LHR 2015, 2019) (FSD, AJK 2017)
A. As antiseptic in medicine
B. For washing eyes
C. In soda bottles
D. For enamels and glazes
Answer:
C. In soda bottles
10. The chief are of Aluminium is: (AJK 2018) (LHR 2019 GII) (MTN 2019)
A. Al2O3
B. Al2O3.H2O
C. Al2O3.2H2O
D. Na3AlF6
Answer:
C. Al2O3.2H2O
