Free NEET Chemistry multiple-choice questions on Oxygen Family (Group 16). Attempt each question and reveal the answer with a full explanation.
The structure of S 8 molecule is: Puckered ring (Crown shape) Linear chain Planar ring Tetrahedral Which of the following is the correct structure for Caro's acid ( H 2SO 5 )? Peroxomonosulfuric acid Pyrosulfuric acid Dithionic acid Thiosulfuric acid The catalyst used in the manufacture of H 2SO 4 by the Contact process is V 2O 5 . The reaction occurring on the catalyst surface is: 2SO 2 + O 2 2SO 3 SO 3 + H 2O H 2SO 4 SO 2 + H 2O H 2SO 3 H 2S + 2O 2 H 2SO 4 Ozone acts as a powerful oxidising agent because it: Easily liberates nascent oxygen Is an allotrope of oxygen Has a resonance structure Is blue in color Among the following, which species is paramagnetic in the vapor state? S 2 S 8 P 4 N 2 The correct order of increasing thermal stability of the hydrides of Group 16 elements is: H 2Te < H 2Se < H 2S < H 2O H 2O < H 2S < H 2Se < H 2Te H 2S < H 2O < H 2Se < H 2Te H 2Se < H 2Te < H 2O < H 2S Which of the following oxoacids of sulfur contains an S-S bond? Dithionic acid ( H 2S 2O 6 ) Pyrosulfuric acid ( H 2S 2O 7 ) Sulfurous acid ( H 2SO 3 ) Peroxodisulfuric acid ( H 2S 2O 8 ) The structure of Sulfur tetrafluoride ( SF 4 ) is: Seesaw Tetrahedral Square planar Trigonal pyramidal Oxygen is paramagnetic. This observation can be best explained by: Molecular Orbital Theory Valence Bond Theory VSEPR Theory Lewis Dot Structure SO 2 gas acts as a reducing agent. It decolorizes which of the following solutions? Acidified KMnO 4 Starch solution Fehling's solution Lime water The number of peroxo ( O-O ) bonds in Marshall's acid ( H 2S 2O 8 ) is: 1 2 0 3 Which of the following hydrides of Group 16 has the highest boiling point? H 2O H 2S H 2Se H 2Te The reaction of Sodium thiosulfate ( Na 2S 2O 3 ) with Iodine ( I 2 ) produces: Sodium tetrathionate ( Na 2S 4O 6 ) Sodium sulfate ( Na 2SO 4 ) Sodium sulfite ( Na 2SO 3 ) Sodium sulfide ( Na 2S ) What is the average oxidation state of Sulfur in Sodium tetrathionate ( Na 2S 4O 6 )? +2.5 +2.0 +3.0 +4.0 When White Phosphorus is heated in a limited supply of air, the product formed is: P 4O 6 P 4O 10 P 2O 3 H 3PO 3 Concentrated Sulfuric acid reacts with Formic acid ( HCOOH ) to produce: Carbon Monoxide ( CO ) Carbon Dioxide ( CO 2 ) Sulfur Dioxide ( SO 2 ) Methane ( CH 4 ) Which of the following is the correct structure of Disulfur dichloride ( S 2Cl 2 )? Open-book structure Linear structure Planar structure Trigonal pyramidal structure Ozone ( O 3 ) is a molecule. Diamagnetic Paramagnetic Ferromagnetic Antiferromagnetic What is the oxidation state of the central Sulfur atom in the Thiosulfate ion ( S 2O 3 2- )? +6 +4 +2 0 Which allotrope of Sulfur exists in a 'chair' conformation? Cyclo- S 6 Cyclo- S 8 Plastic Sulfur Colloidal Sulfur The reaction of elemental Sulfur ( S 8 ) with hot and concentrated Nitric acid ( HNO 3 ) yields: H 2SO 4 , NO 2 , and H 2O SO 2 , NO , and H 2O H 2SO 3 , N 2O , and H 2O S 2Cl 2 and NH 3 Concentrated Sulfuric acid ( H 2SO 4 ) reacts with Oxalic acid ( H 2C 2O 4 ) to produce a mixture of two gases. These gases are: CO and CO 2 CO 2 and SO 2 CO and SO 2 O 2 and CO 2 When concentrated H 2SO 4 is added to sucrose ( C 12 H 22 O 11 ), it turns into a black char. This is due to which property of H 2SO 4 ? Dehydrating agent Oxidising agent Reducing agent Acidic nature The reducing power of hydrides of Group 16 elements follows the order H 2O < H 2S < H 2Se < H 2Te . This is because: The thermal stability of hydrides decreases down the group The electronegativity of the central atom increases down the group The bond angle increases down the group The size of the central atom decreases down the group Which statement is true regarding the bleaching action of SO 2 and Cl 2 ? Bleaching by SO 2 is temporary (reduction) while bleaching by Cl 2 is permanent (oxidation) Bleaching by SO 2 is permanent while bleaching by Cl 2 is temporary Both SO 2 and Cl 2 bleach by oxidation and are permanent Both SO 2 and Cl 2 bleach by reduction and are temporary Sulfur dioxide ( SO 2 ) reacts with Chlorine ( Cl 2 ) in the presence of charcoal as a catalyst to give: Sulfuryl chloride ( SO 2Cl 2 ) Thionyl chloride ( SOCl 2 ) Sulfur tetrachloride ( SCl 4 ) Disulfur dichloride ( S 2Cl 2 ) The molecule S 2 is paramagnetic in nature, similar to O 2 . This state is found when sulfur is in the: Vapor state at high temperatures Rhombic form at room temperature Monoclinic form at 370 K Plastic form In the contact process, the reaction 2SO 2 + O 2 2SO 3 is exothermic. According to Le Chatelier's principle, the yield of SO 3 is maximized by: Low temperature and High pressure High temperature and High pressure Low temperature and Low pressure High temperature and Low pressure The 'tailing of mercury' is due to the formation of: Hg 2O HgO HgS HgCl 2 What is the oxidation state of Sulfur in Caro's acid ( H 2SO 5 )? +6 +8 +5 +4 Sulfur hexafluoride ( SF 6 ) is chemically very inert and is used as a gaseous insulator. Its inertness is primarily due to: Steric hindrance of the sulfur atom by six fluorine atoms The high electronegativity of Sulfur The presence of a lone pair on Sulfur Its trigonal bipyramidal geometry The cyclic trimer of Sulfur trioxide ( S 3O 9 ) contains how many S-O-S bonds? 3 6 0 9 The correct order of bond dissociation enthalpy for the O-O, S-S, Se-Se, Te-Te bonds is: S-S > Se-Se > O-O > Te-Te O-O > S-S > Se-Se > Te-Te S-S > O-O > Se-Se > Te-Te Te-Te > Se-Se > S-S > O-O The transition temperature at which Rhombic sulfur changes into Monoclinic sulfur is: 369 K 273 K 393 K 444 K Which of the following elements of Group 16 exists as a diatomic molecule ( X 2 ) in the vapor phase at temperatures around 1000 K and is paramagnetic? Sulfur Oxygen Selenium Tellurium Which of the following statements about Ozone ( O 3 ) is incorrect? It is an allotrope of Oxygen and is paramagnetic It is a powerful oxidising agent It has a bent (V-shaped) structure It reacts with PbS to form PbSO 4 The correct order of acidic strength of hydrides of Group 16 elements is: H 2O < H 2S < H 2Se < H 2Te H 2Te < H 2Se < H 2S < H 2O H 2S < H 2O < H 2Se < H 2Te H 2O < H 2Se < H 2S < H 2Te Oleum is a mixture of concentrated H 2SO 4 and: SO 3 SO 2 H 2S O 2 Which of the following statements is correct regarding the O-O bond lengths in the Ozone ( O 3 ) molecule? Both O-O bond lengths are equal One O-O bond is significantly longer than the other The bond lengths are 148 pm and 121 pm Bond lengths change constantly due to vibration The bleaching action of Sulfur dioxide ( SO 2 ) is: Temporary and due to reduction Permanent and due to oxidation Temporary and due to oxidation Permanent and due to reduction In the contact process for the manufacture of H 2SO 4 , the catalyst used is: V 2O 5 Fe 2O 3 Pt MnO 2