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Question 1:
Which of the following is the correct order of ionization enthalpy among the elements of Group 15?

A. N > P > As > Sb > Bi
B. N < P < As < Sb < Bi
C. N > As > P > Sb > Bi
D. N > P > Sb > As > Bi
Question 2:
Which of the following oxides of nitrogen is paramagnetic?

A. N₂O
B. NO₂
C. N₂O₃
D. N₂O₄
Question 3:
Which allotrope of phosphorus is the most reactive?

A. White phosphorus
B. Red phosphorus
C. Black phosphorus
D. Purple phosphorus
Question 4:
Which of the following acids is the strongest reducing agent?

A. H₃PO₂
B. H₃PO₃
C. H₃PO₄
D. H₃BO₃
Question 5:
In the laboratory preparation of nitric acid, which reactants are used?

A. Sodium nitrate and sulfuric acid
B. Sodium nitrate and hydrochloric acid
C. Sodium nitrate and nitric acid
D. Potassium nitrate and hydrochloric acid
Question 6:
Which of the following is true about the electronic configuration of Group 16 elements?

A. ns²np⁶
B. ns²np⁴
C. ns²np³
D. ns²np²
Question 7:
Which of the following oxides of sulfur is used in the Contact process for the production of sulfuric acid?

A. SO₂
B. SO₃
C. SO
D. SO₄
Question 8:
Which of the following halogens has the highest electron affinity?

A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Question 9:
What is the oxidation state of iodine in ICl?

A. -1
B. 0
C. +1
D. +3
Question 10:
Which of the following is the correct order of thermal stability of the hydrides of Group 15 elements?

A. PH₃ > NH₃ > AsH₃ > SbH₃ > BiH₃
B. NH₃ > PH₃ > AsH₃ > SbH₃ > BiH₃
C. NH₃ > BiH₃ > PH₃ > AsH₃ > SbH₃
D. BiH₃ > SbH₃ > AsH₃ > PH₃ > NH₃
Question 11:
Which of the following halogens has the highest boiling point?

A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Question 12:
What is the most common oxidation state of lead in its compounds?

A. +2
B. +4
C. +1
D. -2
Question 13:
Which of the following oxides is amphoteric?

A. SiO₂
B. GeO₂
C. SnO₂
D. PbO₂
Question 14:
What is the formula for borax?

A. Na₂B₄O₇·10H₂O
B. Na₄B₂O₇·10H₂O
C. Na₂B₅O₈·10H₂O
D. Na₂BO₃·10H₂O
Question 15:
Which of the following oxides of nitrogen is colorless and is a neutral oxide?

A. NO
B. NO₂
C. N₂O₅
D. N₂O₃
Question 16:
Which of the following elements has the highest melting point among Group 15 elements?

A. Arsenic
B. Phosphorus
C. Antimony
D. Bismuth
Question 17:
Which of the following is the most stable allotrope of sulfur at room temperature?

A. Monoclinic sulfur
B. Rhombic sulfur
C. Plastic sulfur
D. Gaseous sulfur
Question 18:
Which of the following halogens is the weakest oxidizing agent?

A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Question 19:
Which of the following acids has only one hydrogen atom capable of being replaced by a metal atom?

A. H₃PO₄
B. H₃PO₂
C. H₃PO₃
D. H₃BO₃
Question 20:
Which of the following is true about the molecular structure of PCl₅ in gaseous state?

A. It is trigonal bipyramidal
B. It is tetrahedral
C. It is linear
D. It is square planar
Question 21:
Which of the following halogens does not exhibit any positive oxidation state in its compounds?

A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Question 22:
Which of the following is the main reason for inertness in noble gases?

A. Complete electronic shells
B. High atomic radius
C. High ionization enthalpy
D. High density
Question 23:
Which of the following elements does not belong to Group 14?

A. Tin
B. Silicon
C. Selenium
D. Germanium
Question 24:
Which of the following acids contains four phosphorus atoms in its structure?

A. Hypophosphorous acid
B. Pyrophosphoric acid
C. Orthophosphoric acid
D. Metaphosphoric acid
Question 25:
Which of the following elements has the lowest electronegativity among Group 15 elements?

A. Bismuth
B. Antimony
C. Arsenic
D. Phosphorus
Question 26:
Which of the following is the most stable form of carbon?

A. Graphite
B. Diamond
C. Buckminsterfullerene
D. Carbon nanotubes
Question 27:
What is the chemical formula for phosphine?

A. PH₃
B. PF₃
C. PCl₃
D. PBr₃
Question 28:
Which of the following is true about the bonding in silicon carbide?

A. It has covalent bonds
B. It has ionic bonds
C. It has metallic bonds
D. It has van der Waals bonds
Question 29:
Which of the following halogens is the most volatile?

A. Chlorine
B. Fluorine
C. Bromine
D. Iodine
Question 30:
Which of the following is the correct order of reactivity with hydrogen among the Group 17 elements?

A. F₂ > Cl₂ > Br₂ > I₂
B. Cl₂ > F₂ > Br₂ > I₂
C. Cl₂ > Br₂ > I₂ > F₂
D. F₂ > I₂ > Cl₂ > Br₂