MCQs on p-Block Elements
1. Find the amphoteric oxide
A.CaO2
B. CO2
C. SnO2
D. SiO2
Answer:::: C.
2. Graphite has a structural similarity with
A.B2H6
B. B4C
C. B
D. BN
Answer:::: D.
3. Which is the correct order of decreasing acidity of lewis acids?
A.BBr3 > BCl3 > BF3
B. BF3 > BCl3 > BBr3
C. BCl3 > BF3 > BBr3
D. BBr3 > BF3 > BCl3
Answer:::: A
4. In the presence of KF, AlF3 is soluble in HF. Find the complex formed
A.K3[AlF6]
B. AlH3
C. K[AlF3H]
D. K3[AlF3H3]
Answer:::: A
5. S-S bond is present in which of the ion pairs
A.S2O72-, S2O32-
B. S4O62-, S2O72-
C. S2O72-, S2O82-
D. S4O62-, S2O32-
Answer:::: D.
6. Which is the correct order of decreasing bond dissociation enthalpy?
A.F2 > Cl2 > Br2 > I2
B. I2 > Br2 > Cl2 > F2
C. Cl2 > Br2 > F2 > I2
D. Br2 > I2 > F2 > Cl2
Answer:::: C.
7. Oxygen is not released on heating which of the compounds?
A.(NH4)2Cr2O7
B. K2Cr2O7
C. Zn(ClO3)2
D. KClO3
Answer:::: A
8. Which of the species has a permanent dipole moment?
A.SF4
B. SiF4
C. BF3
D. XeF4
Answer:::: A
9. Which of the statement is incorrect for XeO4 ?
A. four p𝜋-d𝜋 bonds are present
B. four sp3 – p 𝜎 bonds are present
C. It has a tetrahedral shape
D. It has a square planar shape
Answer:::: D.
10. P4O10 has ______ bridging O atoms
A. 4
B. 5
C. 6
D. 2
Answer:::: C.
