Free NEET Chemistry multiple-choice questions on Carbon Family (Group 14). Attempt each question and reveal the answer with a full explanation.
Which of the following is the reason for the high toxicity of Carbon Monoxide ( CO )? It forms a stable complex with hemoglobin It is highly acidic It reacts with water in lungs It reduces the oxygen in the air Sodium silicate is formed when silica ( SiO 2 ) reacts with: NaOH HCl H 2O CO 2 The basic structural unit of silicates is: SiO 4 4- SiO 3 2- SiO 2 Si 2O 7 6- Which of the following allotropes of Carbon has the highest thermal conductivity and can also act as an abrasive? Diamond Graphite Fullerene Carbon Black Phosgene, a highly poisonous gas used in chemical warfare, is chemically known as Carbonyl chloride. It is prepared by the reaction of: CO + Cl 2 in the presence of sunlight CO 2 + Cl 2 at high temperature CCl 4 + H 2O vapor CH 4 + Cl 2 in dark In the structure of Quartz, each Silicon atom is covalently bonded in a tetrahedral manner to: Four oxygen atoms Two oxygen atoms Six silicon atoms Four silicon atoms Diamond is a very hard substance and an electrical insulator. These properties are due to its structure where each carbon atom is: sp 3 hybridized in a 3D network sp 2 hybridized in layered sheets sp hybridized in linear chains Bonded by weak Van der Waals forces Which one of the following oxides is expected to exhibit paramagnetic behaviour - CO2 ClO2 SO2 SiO2 The correct order of acid strength is - HClO4 < HClO3 < HClO2 < HClO HClO2 < HClO3 < HClO4 < HClO HClO4 < HClO < HClO2 < HClO3 HClO < HClO2 < HClO3 < HClO4 Among the following which is the strongest oxidizing agent ? - Cl 2 F 2 Br 2 I 2 Which is the strongest acid in the following? H2SO4 HClO3 HClO4 H2SO3 The correct order of stability of +2 oxidation state for Group 14 elements is: Ge < Sn < Pb Pb < Sn < Ge Ge < Pb < Sn Sn < Ge < Pb Acidity of diprotic acids in aqueous solutions increases in the order :- H2S < H2Se < H2Te H2Se < H2S < H2Te H2Te < H2S < H2Se H2Se < H2Te < H2S Among the following, the correct order of acidity is HClO3 < HClO4 < HClO2 < HClO HClO < HClO2 < HClO3 < HClO4 HClO2 < HClO < HClO3 < HClO4 HClO4 < HClO2 < HClO < HClO3 Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules? I2 > Br2 > Cl2 > F2 Cl2 > Br2 > F2 > I2 Br2 > I2 > F2 > Cl2 F2 > Cl2 > Br2 > I2 Among halogens, the one which can oxidise water to oxygen is : iodine chlorine bromine fluorine The correct order of N-compounds in its decreasing order of oxidation states is HNO3 , NH4Cl , NO , N2 HNO3 , NO , NH4Cl , N2 HNO3 , NO , N2 , NH4Cl NH4Cl , N2 , NO , HNO3 Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity? N2O NO2 N2O5 NO Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po)? H2Se < H2Te < H2Po < H2O < H2S H2S < H2O < H2Se < H2Te < H2Po H2O < H2S < H2Se < H2Te < H2Po H2Po < H2Te < H2Se < H2S < H2O Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them. Noble gases have very high melting and boiling points Noble gases have weak dispersion forces Noble gases have large positive values of electron gain enthalpy Noble gases are sparingly soluble in water Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): ICl is more reactive than I2 . Reason (R): I-Cl bond is weaker than I-I bond. In the light of the above statements, choose the most appropriate answer from the options given below: Both (A) and (R) are correct but (R) is not the correct explanation of (A). (A) is correct but (R) is not correct (A) is not correct but (R) is correct Both (A) and (R) are correct and (R) is the correct explanation of (A). Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Helium is used to dilute oxygen in diving apparatus. Reason R : Helium has high solubility in O2 . In the light of the above statements, choose the correct answer from the options given below Both A and R are true and R correct explanation of A Both A and R are true and R is NOT the correct explanation of A A is true but R is false A is false but R is true Which of the following describes the hybridization and conductivity of Graphite? sp 2 , Conductor sp 3 , Insulator sp 2 , Insulator sp 3 , Conductor Among Group 16 elements, which one does NOT show -2 oxidation state? O Se Te Po Given below are two statements : Statement I : Like nitrogen that can form ammonia, arsenic can form arsine. Statement II : Antimony cannot form antimony pentoxide. In the light of the above statements, choose the most appropriate answer from the options given below : Statement I is incorrect but Statement II is correct Both Statement I and Statement II are correct Both Statement I and Statement II are incorrect Statement I is correct but Statement II is incorrect Which of the following statements about Buckminsterfullerene ( C 60 ) is correct? It contains 20 six-membered rings and 12 five-membered rings It contains 12 six-membered rings and 20 five-membered rings Each carbon atom is sp 3 hybridized It is a non-aromatic cage-like structure Identify the incorrect statement regarding the allotropes of carbon: In graphite, each carbon is sp 3 hybridized Diamond is a covalent 3D network solid Graphite is a good conductor of electricity Fullerenes are prepared by heating graphite in an electric arc PbO 2 is a strong oxidizing agent because: Pb 2+ is more stable than Pb 4+ due to the inert pair effect Pb 4+ is more stable than Pb 2+ Lead is a noble metal PbO 2 is an acidic oxide Which of the following halides is most easily hydrolyzed? SiCl 4 CCl 4 SnCl 4 PbCl 4 The repeating unit in the structure of linear silicones is: -R 2SiO- -R 3SiO- -RSiO 2- -R 2SiO 2- Which of the following compounds does not undergo hydrolysis under normal conditions? CCl 4 SiCl 4 SnCl 4 PCl 3 Carbon dioxide ( CO 2 ) is a gas while Silicon dioxide ( SiO 2 ) is a high melting solid because: SiO 2 forms a giant covalent 3D-network CO 2 has stronger intermolecular forces Si is more electronegative than C CO 2 is a polar molecule Silicones are formed by the hydrolysis and subsequent polymerization of: R 2SiCl 2 R 3SiCl RSiCl 3 SiCl 4 Which reagent is commonly used for etching glass? HF HCl HNO 3 H 2SO 4 The C-C bond length in Graphite is: 141.5 pm 154 pm 134 pm 120 pm To obtain a cross-linked silicone polymer, the starting material used for hydrolysis should be: RSiCl 3 R 2SiCl 2 R 3SiCl R 4Si While [SiF 6] 2- is well known, the corresponding ion [SiCl 6] 2- is not known. This is because: Six large Cl atoms cannot be accommodated around Si due to steric hindrance Chlorine is more electronegative than Fluorine Si-Cl bond is stronger than Si-F bond Silicon does not have vacant d-orbitals Buckminsterfullerene ( C 60 ) contains: 20 hexagons and 12 pentagons 12 hexagons and 20 pentagons 18 hexagons and 14 pentagons 24 hexagons and 10 pentagons Which of the following is the correct formula and linear structure for Carbon suboxide? O=C=C=C=O O=C=C=O O=C=O O=C=C=C=C=O Which of the following Group 14 chlorides is the most stable? PbCl 2 PbCl 4 CCl 4 SiCl 4 In the structure of Silica ( SiO 2 ), each Silicon atom is surrounded by: Four Oxygen atoms tetrahedrally Two Oxygen atoms linearly Six Oxygen atoms octahedrally Three Oxygen atoms trigonally Red Lead ( Pb 3O 4 ) is considered a mixed oxide. What is the actual composition and the oxidation states of Lead present in it? 2PbO PbO 2 ; oxidation states +2 and +4 PbO 2PbO 2 ; oxidation states +2 and +4 PbO Pb 2O 3 ; oxidation states +2 and +3 3PbO O 2 ; oxidation state +2 only The phenomenon known as 'Tin Pest' or 'Tin Plague' is associated with: The conversion of white tin to gray tin at low temperatures The corrosion of tin in the presence of acidic rain The formation of a layer of SnO 2 on the surface of tin The reaction of tin with pest control chemicals In the C 60 (Buckminsterfullerene) molecule, the number of hexagons and pentagons are respectively: 20 and 12 12 and 20 24 and 10 15 and 15 Tin(II) chloride ( SnCl 2 ) acts as a good: Reducing agent Oxidising agent Dehydrating agent Catalyst for Ostwald process Which of the following is used to regulate the chain length of silicone polymers? (CH 3) 3SiCl (CH 3) 2SiCl 2 CH 3SiCl 3 (CH 3) 4Si What is the reason for the 'hydrophobic' nature of silicones? The presence of non-polar alkyl groups on the outside of the polymer chain The presence of highly polar Si-O-Si bonds The high electronegativity of the Silicon atom The crystalline structure of the polymer In the structure of Quartz, the basic framework consists of SiO 4 tetrahedra. These tetrahedra are joined together by sharing: All four oxygen atoms Only two oxygen atoms Only three oxygen atoms One oxygen atom and one silicon atom Which of the following is an example of a 'Sheet Silicate'? Talc Quartz Zeolite Beryl In the silicate mineral Beryl ( Be 3Al 2Si 6O 18 ), the structural framework consists of which type of silicate unit? Cyclic silicate Orthosilicate Sheet silicate Pyro-silicate In the molecule of Carbon Monoxide ( CO ), the bond consists of: One and two bonds One and one bond Three bonds Two and one bond Which of the following is the most basic oxide:- Al2O3 Sb2O3 Bi2O3 SeO2 Which one of the following orders is not in according with the property stated against it ? F2 > Cl2 > Br2 > I2 ; Oxidising power HI > HBr > HCl > HF ; Acidic property in water F2 > Cl2 > Br2 > I2 ; Electronegativity F2 > Cl2 > Br2 > I2 ; Bond dissociation energy Which of the following pairs shows highest bond dissociation enthalpy among halogens and lowest bond dissociation enthalpy among hydrogen halides? I2 , HI F2 , HF Cl2 , HCl Cl2 , HI Which of the following statements is not true for halogens? All but fluorine show positive oxidation states All are oxidizing agents All form monobasic oxyacids Chlorine has the highest electron-gain enthalpy The correct order of catenation property in group 14 elements is: C >> Si > Ge Sn C > Si > Ge > Sn > Pb C < Si < Ge < Sn Si > C > Sn > Ge Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code: array ll Column-I & Column-II (a) XeF4 & (i) Pyramidal (b) XeF6 & (ii) Square planar (c) XeOF4 & (iii) Distorted octahedral (d) XeO3 & (iv) Square pyramidal array a-iii, b-iv, c-i, d-ii a-i, b-ii, c-iii, d-iv a-ii, b-iii, c-iv, d-i a-ii, b-iii, c-i, d-iv Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI . Statement II : As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF , HCl , HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below. Both Statement I and Statement II are false Statement I is correct but statement II is false Statement I is incorrect but Statement II is true Both statement I and Statement II are true In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it? H2O < H2S < H2Se < H2Te : Increasing pK a values NH3 < PH3 < AsH3 < SbH3 : Increasing acidic character CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing power HF < HCl < HBr < HI : Increasing acidic strength Given below are two statements Statement I The boiling points of the following hydrides of group 16 elements increases in the order – H2O < H2S < H2Se < H2Te Statement II The boiling points of these hydrides increase with increase in molar mass. In the light of the above statements, choose the most appropriate answer from the options given below : Both Statement I and Statement II are incorrect Statement I is correct but Statement II is incorrect Statement I is incorrect but Statement II is correct Both Statement I and Statement II are correct Identify the incorrect statement from the following: Phosphorus, arsenic and antimony show catenation property. P(C2H5)3 and As(C6H5)3 form d - d bond with transition metals. Nitrogen can form d - p bond with oxygen. Nitrogen can form p - p multiple bonds with itself. In the bonding of Metal Carbonyls, there is a 'synergic effect'. This involves: -bond from CO to Metal and -back donation from Metal to CO -bond from CO to Metal and -back donation from Metal to CO Only -bond from CO to Metal Only -back donation from Metal to CO In the structure of Silica ( SiO 2 ), the bond angle Si-O-Si is approximately: 144 ∘ 109.5 ∘ 180 ∘ 120 ∘ Which of the following is the correct order of the ease of hydrolysis for group 14 tetrahalides? SiCl 4 < GeCl 4 < SnCl 4 < PbCl 4 CCl 4 < SiCl 4 < GeCl 4 < SnCl 4 SnCl 4 < GeCl 4 < SiCl 4 < CCl 4 PbCl 4 < SnCl 4 < GeCl 4 < SiCl 4 The hydrolysis of Silicon tetrachloride ( SiCl 4 ) proceeds via the formation of an unstable intermediate where the coordination number of Silicon increases from 4 to: 6 5 8 3 The reaction of Red Lead ( Pb 3O 4 ) with hot concentrated Nitric acid ( HNO 3 ) yields which of the following products? Pb(NO 3) 2 + PbO 2 + H 2O Pb(NO 3) 2 + H 2O PbO 2 + NO 2 + H 2O Pb(NO 3) 4 + H 2O Which of the following is used as a lubricant and why? Graphite, because of its layered structure and weak van der Waals forces Diamond, because of its hardness Silica, because of its network structure Fullerene, because of its cage-like structure Which of the following is the correct order of the ease of hydrolysis for the tetrahalides of Group 14 elements? SiCl 4 < GeCl 4 < SnCl 4 < PbCl 4 SiCl 4 > GeCl 4 > SnCl 4 > PbCl 4 CCl 4 > SiCl 4 > GeCl 4 > SnCl 4 PbCl 4 < SnCl 4 < GeCl 4 < SiCl 4 The correct structure of tribromooctaoxide is A mixture of CO and H 2 gases is commonly known as: Synthesis gas Producer gas Natural gas Coal gas The thermodynamically most stable allotrope of Carbon is: Graphite Diamond Fullerene Coal