NEET Chemistry
The p-Block Elements
Question 1:
The elements which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is
(a) B
(b) Al
(c) Ga
(d) In [Level: Easy]
Question 2:
Which of the following is a Lewis acid?
(a) AlCl3
(b) MgCl2
(c) CaCl2
(d) BaCl2 [Level: Easy]
Question 3:
Which of the following oxides is acidic in nature?
(a) B2O3
(c) Ga2O3
(d) In2O3 [Level: Moderate]
Question 4:
The exhibition of highest coordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in MF63- ?
(a) B
(b) Al
(c) Ga
(d) In [Level: Difficult]
Question 5:
Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in group 14 elements follows the order
(a) C > Si > Ge > Sn
(b) C > > Si > Ge ≈ Sn
(c) Si > C > Sn > Ge
(d) Ge > Sn > Si > C [Level: Difficult]
Question 6:
Ionisation enthalpy (ΔiH/kJ mol–1) for the elements of group 13 follows the order
(a) B > Al > Ga > In > Tl
(b) B < Al < Ga < In < Tl
(c) B < Al > Ga < In > Tl
(d) B > Al < Ga > In < Tl [Level: Moderate]
Question 7:
The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence :
(a) Ga < In < Al < Tl
(c) Tl < In < Ga < Al
(d) In < Tl < Ga < Al [Level: Moderate]
Question 8:
Acidity of diprotic acids in aqueous solutions increases in the order :
(b) H2Se < H2S < H2Te
(c) H2Te < H2S < H2Se
(d) H2Se < H2Te < H2S [Level: Difficult]
Question 9:
Which of the following is not tetrahedral in shape?
(a) NH4+
(b) SiCl4
(c) SF4
(d) SO42– [Level: Moderate]
Question 10:
Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is
(a) Bi2O5
(b) BiF5
(c) BiCl5
(d) Bi2S5 [Level: Moderate]
Question 11:
Which of the following statements is wrong?
(a) Single N — N bond is stronger than the single P — P bond.
(b) PH3 can act as a ligand in the formation of coordination compounds with transition elements.
(c) NO2 is paramagnetic in nature.
(d) Covalency of nitrogen in N2O3 is four. [Level: Moderate]
Question 12:
Which of the following elements does not show allotropy?
(b) Bismuth
(c) Antimony
(d) Arsenic [Level: Moderate]
Question 13:
Which of the following elements can be involved in pπ – dπ bonding?
(a) Carbon
(b) Nitrogen
(d) Boron [Level: Moderate]
Question 14:
Noble gases are used in discharge tubes to gives different colours. Reddish orange glow is due to
(a) Ar
(c) Xe
(d) Kr [Level: Easy]
Question 15:
Which of the following shows nitrogen with its increasing order of oxidation number?
(a) NO < N2O < NO2 < NO3– < NH4+
(b) NH4+ < N2O < NO2 < NO3– < NO
(c) NH4+ < N2O < NO < NO2 < NO3–
(d) NH4+ < NO < N2O < NO2 < NO3– [Level: Moderate]
Question 16:
Which of the following fluorides does not exist?
(a) NF5
(b) PF5
(c) AsF5
(d) SbF5 [Level: Moderate]
Question 17:
In nitrogen family, the H-M-H bond angle in the hydrides gradually becomes closer to 90⁰ on going from N to Sb. This shows that gradually
(a) The basic strength of the hydrides increases
(b) Almost pure p-orbitals are used for M-H bonding
(c) The bond energies of M-H bonds increase
(d) The bond pairs of electrons become nearer to the central atom [Level: Difficult]
Question 18:
In which of the following compounds, nitrogen exhibits highest oxidation state?
(a) N2H4
(b) NH3
(d) NH2OH [Level: Easy]
Question 19:
Which of the following oxide is amphoteric?
(a) SnO2
(b) CaO
(c) SiO2
(d) CO2 [Level: Easy]
Question 20:
In compounds of type ECl3, where E = B, P, As or Bi, the angles Cl - E- Cl for different E are in the order
(a) B > P = As = Bi
(b) B > P > As > Bi
(c) B < P = As = Bi
(d) B < P < As < Bi [Level: Difficult]
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