The p-Block Elements MCQs with answers

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Q. Which one of the following order is correct for the bond dissociation enthalpy of halogen molecule?
  • (A) Br2 > I2 > F2 > Cl2
  • (B) F2 > Cl2 > Br2 > I2
  • (C) 2I2 > Br2 > Cl2 > F2
  • (D) Cl2 > Br2 > F2 > I2
πŸ’¬ Discuss
βœ… Correct Answer: (D) Cl2 > Br2 > F2 > I2
Q. Among the following, which one is a wrong statement.
  • (A) PH5 and BiCl5 do not exist.
  • (B) pΟ€-dΟ€ bonds are present in SO2
  • (C) SeF4 and CH4 have same shape.
  • (D) I3 has bent geometry.
πŸ’¬ Discuss
βœ… Correct Answer: (C) SeF4 and CH4 have same shape.
Q. Which is strongest acid in the following:
  • (A) HClO4
  • (B) H2SO3
  • (C) H2SO4
  • (D) HClO3
πŸ’¬ Discuss
βœ… Correct Answer: (A) HClO4
Q. The correct order of oxidising power is
  • (A) HClO4 > HClO3 > HClO2 > HCIO
  • (B) HOCl > HClO2 > HClO3 > HClO4
  • (C) HClO3 > HClO4 > HClO2 > HClO
  • (D) HCIO2 > HOCl > HClO3 > HClO4
πŸ’¬ Discuss
βœ… Correct Answer: (B) HOCl > HClO2 > HClO3 > HClO4
Q. The correct order of acid strength is
  • (A) HClO4 < HClO3 < HClO2 < HClO
  • (B) HCIO < HClO2 < HClO3 < HClO4
  • (C) HClO4 < HClO < HClO2 < HClO3
  • (D) HClO2 < HClO3 < HClO4 < HClO
πŸ’¬ Discuss
βœ… Correct Answer: (B) HCIO < HClO2 < HClO3 < HClO4
Q. Among the following which is strongest oxidising agent.
  • (A) Br2
  • (B) I2
  • (C) Cl2
  • (D) F2
πŸ’¬ Discuss
βœ… Correct Answer: (D) F2
Q. When Cl2 reacts with hot and cone. NaOH, the oxidation number of chlorine changes from
  • (A) zero to +1 and zero to +5
  • (B) 0 to -1 and 0 to +5
  • (C) zero to -1 and zero to +3
  • (D) 0 to +1 and 0 to -3
πŸ’¬ Discuss
βœ… Correct Answer: (B) 0 to -1 and 0 to +5
Q. Acidity of diprotic acid in aqueous solution increases in the order.
  • (A) H2S < H2Se < H2Te
  • (B) H2Se < H2S < H2Te
  • (C) H2Te < H2S < H2Se
  • (D) H2Se < H2Te < H2S
πŸ’¬ Discuss
βœ… Correct Answer: (A) H2S < H2Se < H2Te
Q. Chlorine reacts with excess of NH3 to form
  • (A) NH4Cl
  • (B) N2 + HCl
  • (C) N2 + NH4Cl
  • (D) NCl3 + HCl
πŸ’¬ Discuss
βœ… Correct Answer: (C) N2 + NH4Cl
Q. Which of the following reactions is an example of redox reaction?
  • (A) XeF4 + O2F2 β†’ XeF6 + O2
  • (B) XeF2 + PF5 β†’ [XeF]+ [PF6]–
  • (C) XeF6 + H2O β†’ XeOF4 + 2HF
  • (D) XeF6 + 2H2O β†’ Xeo2F2 + 2HF
πŸ’¬ Discuss
βœ… Correct Answer: (A) XeF4 + O2F2 β†’ XeF6 + O2
Q. On addition of cone. H2SO4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet flames come out. This is because
  • (A) H2SO4 reduces HI to I2
  • (B) HI is of violet colour
  • (C) HI gets oxidised to I2
  • (D) HI changes to HIO3
πŸ’¬ Discuss
βœ… Correct Answer: (C) HI gets oxidised to I2
Q. Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?
  • (A) HF
  • (B) HCl
  • (C) HBr
  • (D) HI
πŸ’¬ Discuss
βœ… Correct Answer: (A) HF
Q. Bond dissociation enthalpy of Eβ€”H (E = element) bonds is given below. Which of the compounds will act as strongest reducing agent?
  • (A) NH3
  • (B) PH3
  • (C) AsH3
  • (D) SbH3
πŸ’¬ Discuss
βœ… Correct Answer: (D) SbH3
Q. Hot cone. H2SO4 acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by cone. H2SO4 into two gaseous products?
  • (A) Cu
  • (B) S
  • (C) C
  • (D) Zn
πŸ’¬ Discuss
βœ… Correct Answer: (C) C
Q. H2S is more acidic than H2O because
  • (A) oxygen is more electronegative than sulphur.
  • (B) atomic number of sulphur is higher than oxygen.
  • (C) H β€” O bond dissociation energy is less also compared to H β€” S bond.
  • (D) H β€” S bond dissociation energy is less as compared to H β€” O bond
πŸ’¬ Discuss
βœ… Correct Answer: (B) atomic number of sulphur is higher than oxygen.
Q. The boiling points of hydrides of group 16 are in the orde
  • (A) H2O > H2Te > H2S > H2Se
  • (B) H2O > H2S > H2Se > H2Te
  • (C) H2O > H2Te > H2Se > H2S
  • (D) None of these
πŸ’¬ Discuss
βœ… Correct Answer: (B) H2O > H2S > H2Se > H2Te
Q. In the manufacture of sulphuric acid by contact process Tyndall box is used to
  • (A) convert SO2 and SO3
  • (B) test the presence of dust particles
  • (C) remove impurities
  • (D) filter dust particles
πŸ’¬ Discuss
βœ… Correct Answer: (B) test the presence of dust particles
Q. Fluorine differs from rest of the halogens in some of its properties. This is due to
  • (A) its smaller size and high electronegativity.
  • (B) lack of d-orbitals.
  • (C) low bond dissociation energy.
  • (D) All of the these.
πŸ’¬ Discuss
βœ… Correct Answer: (B) lack of d-orbitals.
Q. The set with correct order of acidity is
  • (A) HClO < HClO2 < HClO3 < HClO4
  • (B) HClO4 < HClO3 < HClO2 < HClO
  • (C) HClO < HClO4 < HClO3 < HClO2
  • (D) HClO4 < HClO2 < HClO3 < HClO
πŸ’¬ Discuss
βœ… Correct Answer: (B) HClO4 < HClO3 < HClO2 < HClO
Q. When chlorine reacts with cold and dilute solution of sodium hydroxide, it forms
  • (A) Cl– and ClO–
  • (B) Cl– and ClO2–
  • (C) Cl– and ClO3–
  • (D) Cl– and ClO4–
πŸ’¬ Discuss
βœ… Correct Answer: (A) Cl– and ClO–
Q. The formation of O2+ [PtF6]– is the basis for the formation of first xenon compound. This is because
  • (A) O2 and Xe have different sizes.
  • (B) both O2 and Xe are gases.
  • (C) O2 and Xe have comparable electro-negativities.
  • (D) O2 and Xe have comparable ionisation enthalpies.
πŸ’¬ Discuss
βœ… Correct Answer: (D) O2 and Xe have comparable ionisation enthalpies.
Q. Partial hydrolysis of XeF4 gives
  • (A) XeO3
  • (B) XeOF2
  • (C) XeOF4
  • (D) XeF2
πŸ’¬ Discuss
βœ… Correct Answer: (B) XeOF2
Q. Helium is preferred to be used in balloons instead of hydrogen because it is
  • (A) incombustible
  • (B) lighter than hydrogen
  • (C) more abundant than hydrogen
  • (D) non polarizable
πŸ’¬ Discuss
βœ… Correct Answer: (A) incombustible
Q. The increasing order of reducing power of the halogen acids is
  • (A) HF < HCl < HBr < HI
  • (B) HI < HBr < HCl < HF
  • (C) HBr < HCl < HF < HI
  • (D) HCl < HBr < HF < HI
πŸ’¬ Discuss
βœ… Correct Answer: (A) HF < HCl < HBr < HI
Q. Which of the following statements are not correct?
  • (A) Among halogens, radius ratio between iodine and fluorine is maximum.
  • (B) Leaving Fβ€”F bond, all halogens have weaker Xβ€”X bond than Xβ€”X’ bond in interhalogens.
  • (C) Among interhalogen compounds maximum number of atoms are present in iodine fluoride.
  • (D) Interhalogen compounds are more reactive than halogen compounds.
πŸ’¬ Discuss
βœ… Correct Answer: (B) Leaving Fβ€”F bond, all halogens have weaker Xβ€”X bond than Xβ€”X’ bond in interhalogens.
Q. Match the items of Columns I and II and mark the correct option.
Column I Column II
(A) H2SO4 (1) Highest electron gain enthalpy
(B) CCl3NO2 (2) Chalcogen
(C) Cl2 (3) Tear gas
(D) Sulphur (4) Storage batteries
  • (A) A (4) B (3) C (1) D (2)
  • (B) A (3) B (4) C (1) D (2)
  • (C) A (4) B (1) C (2) D (3)
  • (D) A (2) B (1) C (3) D (4)
πŸ’¬ Discuss
βœ… Correct Answer: (A) A (4) B (3) C (1) D (2)

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Table of contents

  1. Which one of the following order is correct for the bond dissociation enthalpy of halogen molecule?
  2. Among the following, which one is a wrong statement.
  3. Which is strongest acid in the following:
  4. The correct order of oxidising power is
  5. The correct order of acid strength is
  6. Among the following which is strongest oxidising agent.
  7. When Cl2 reacts with hot and cone. NaOH, the oxidation number of chlorine changes from
  8. Acidity of diprotic acid in aqueous solution increases in the order.
  9. Chlorine reacts with excess of NH3 to form
  10. Which of the following reactions is an example of redox reaction?
  11. On addition of cone. H2SO4 to a chloride salt, colourless fumes are evolved bu
  12. Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids sho
  13. Bond dissociation enthalpy of Eβ€”H (E = element) bonds is given below. Which of the compounds will
  14. Hot cone. H2SO4 acts as moderately strong oxidising agent. It oxidises both me
  15. H2S is more acidic than H2O because
  16. The boiling points of hydrides of group 16 are in the orde
  17. In the manufacture of sulphuric acid by contact process Tyndall box is used to
  18. Fluorine differs from rest of the halogens in some of its properties. This is due to
  19. The set with correct order of acidity is
  20. When chlorine reacts with cold and dilute solution of sodium hydroxide, it forms
  21. The formation of O2+ [PtF6]– is the basis for the
  22. Partial hydrolysis of XeF4 gives
  23. Helium is preferred to be used in balloons instead of hydrogen because it is
  24. The increasing order of reducing power of the halogen acids is
  25. Which of the following statements are not correct?
  26. Match the items of Columns I and II and mark the correct option. Column I Column II (A)

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