CBSE Class 12 Chemistry The p Block Elements Assignment

Question. Which would quickly absorb oxygen?
(a) Alkaline solution of pyrogallol
(b) Conc. H₂SO₄
(c) Lime water
(d) Alkaline solution of CuSO₄

Question. Oxygen will directly react with each of the following elements except
(a) P
(b) Cl
(c) Na
(d) S 

Question. It is possible to obtain oxygen from air by fractional distillation because
(a) oxygen is in a different group of the periodic table from nitrogen
(b) oxygen is more reactive than nitrogen
(c) oxygen has higher b.pt. than nitrogen
(d) oxygen has a lower density than nitrogen.

Question. The angular shape of ozone molecule (O₃) consists of
(a) 1s and 1p bond
(b) 2s and 1p bond
(c) 1s and 2p bonds
(d) 2s and 2p bonds. 

Question. The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are
(a) O₃, CH₄
(b) O₂, O₃
(c) SO₂, CH₄
(d) N₂O, O₃

Question. Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?
(a) Is soluble in water.
(b) Is used as a food preservative.
(c) Forms ‘acid-rain’.
(d) Is a reducing agent.

Question. Which of the following oxoacid of sulphur has — O — O — linkage
(a) H₂SO₃, sulphurous acid
(b) H₂SO₄, sulphuric acid
(c) H2S₂O₈, peroxodisulphuric acid
(d) H₂S₂O₇, pyrosulphuric acid 

Question. Identify the correct formula of oleum from the following :
(a) H₂S₂O₇
(b) H₂SO₃
(c) H₂SO₄
(d) H₂S₂O₈

Question. In which pair of ions both the species contain S — S bond?
(a) S₄O₆^2–, S₂O₃^2–
(b) S₂O₇^2–, S₂O₈^2–
(c) S₄O₆^2–, S₂O₇^2–
(d) S₂O₇^2–, S₂O₃^2–

Question. Oleum is
(a) castor oil
(b) oil of vitriol
(c) fuming H₂SO₄
(d) none of these.

Question. Which of the following statements is not true for halogens?
(a) All form monobasic oxyacids.
(b) All are oxidizing agents.
(c) All but fluorine show positive oxidation states.
(d) Chlorine has the highest electron-gain enthalpy. 

Question. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
(a) Br₂ > I₂ > F₂ > Cl₂
(b) F₂ > Cl₂ > Br₂ > I₂
(c) I₂ > Br₂ > Cl₂ > F₂
(d) Cl₂ > Br₂ > F₂ > I₂

Question. The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl.
What explains the higher boiling point of hydrogen fluoride?
(a) There is strong hydrogen bonding between HF molecules.
(b) The bond energy of HF molecules is greater than in other hydrogen halides.
(c) The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
(d) The electronegativity of fluorine is much higher than for other elements in the group. 

Question. Among the following which is the strongest oxidising agent?
(a) Br₂
(b) I₂
(c) Cl₂
(d) F₂ 

Question. Which one of the following arrangements does not give the correct picture of the trends indicated against it?
(a) F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy
(b) F₂ > Cl₂ > Br₂ > I₂ : Electronegativity
(c) F₂ > Cl₂ > Br₂ > I₂ : Oxidizing power
(d) F₂ > Cl₂ > Br₂ > I₂ : Electron gain enthalpy

Question. Which one of the following orders is not in accordance with the property stated against it?
(a) F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy
(b) F₂ > Cl₂ > Br₂ > I₂ : Oxidising power
(c) HI > HBr > HCl > HF : Acidic property in water
(d) F₂ > Cl₂ > Br₂ > I₂ : Electronegativity 

Question. Which statement is wrong?
(a) Bond energy of F₂ > Cl₂
(b) Electronegativity of F > Cl
(c) F is more oxidising than Cl
(d) Electron affinity of Cl > F 

Question. Which of the following has the greatest electron affinity?
(a) I
(b) Br
(c) F
(d) Cl 

Question. Which of the following displaces Br2 from an aqueous solution containing bromide ions?
(a) I₂
(b) I₃–
(c) Cl₂
(d) Cl– 

Question. Which of the following species has four lone pairs of electrons?
(a) I
(b) O
(c) Cl–
(d) He