Free NEET Chemistry multiple-choice questions on Noble Gases (Group 18). Attempt each question and reveal the answer with a full explanation.
The noble gas which does not form any known true chemical compound is: Helium Xenon Krypton Radon The force of attraction that exists between the atoms of noble gases in the liquid or solid state is: London dispersion forces Dipole-dipole interactions Hydrogen bonding Ion-dipole forces The gas used in welding to provide an inert atmosphere is: Argon Helium Neon Krypton Which noble gas is used in magnetic resonance imaging (MRI) systems as a cryogenic agent? Helium Neon Argon Krypton Which noble gas is used in high-speed photography and in 'strobe' lights due to its ability to produce a bright white flash? Xenon ( Xe ) Argon ( Ar ) Neon ( Ne ) Krypton ( Kr ) Radon ( Rn ) is a noble gas used in: Radiotherapy for the treatment of cancer Filling weather balloons Neon sign bulbs Providing an inert atmosphere for welding Which of the following products is formed by the complete hydrolysis of XeF 6 ? XeO 3 XeOF 4 XeO 2F 2 XeO 4 The geometry of XeO 3 is: Pyramidal Trigonal planar T-shaped Linear To prepare XeF 2 in the laboratory, the ratio of Xenon to Fluorine used is: 2:1 (excess Xenon) 1:5 1:20 1:1 The geometry of XeO 4 is: Tetrahedral Square planar Pyramidal Octahedral What is the number of lone pairs on the central Xenon atom in XeF 2 ? 3 2 1 0 Which noble gas was first used by Neil Bartlett to react with PtF 6 ? Xenon Krypton Argon Helium Partial hydrolysis of XeF 6 gives: XeOF 4 XeO 3 XeO 2F 2 XeF 4 Neil Bartlett used Xenon to react with PtF 6 because he observed that: First ionization enthalpy of Xe is close to that of O 2 Atomic size of Xe is close to that of O 2 Electronegativity of Xe is same as O 2 Xe is more reactive than Neon The total number of lone pairs of electrons on the central Xenon atom in XeF 6 is: 1 2 3 0 The molecular geometry of Xenon oxytetrafluoride ( XeOF 4 ) is: Square pyramidal Octahedral Square planar Trigonal bipyramidal Partial hydrolysis of XeF 6 with one mole of water yields: XeOF 4 XeO 2F 2 XeO 3 XeO 4 To prepare Xenon tetrafluoride ( XeF 4 ), the reaction between Xe and F 2 should be carried out in which of the following molar ratios? 1:5 1:1 1:20 2:1 The geometry of Xenon dioxydifluoride ( XeO 2F 2 ) is: See-saw Square planar Tetrahedral Trigonal bipyramidal Xenon hexafluoride ( XeF 6 ) reacts with alkali metal fluorides ( MF ) to form which type of addition compounds? M[XeF 7] M 2[XeF 8] M[XeF 5] M[XeF 6] To prepare Xenon tetrafluoride ( XeF 4 ), a mixture of Xe and F 2 in a 1:5 volume ratio is heated at 873 K and 7 bar pressure in a vessel made of: Nickel Glass Copper Iron The geometry of XeF 6 in the vapor phase is best described as: Distorted octahedral Regular octahedral Pentagonal bipyramidal Square pyramidal Which of the following statements about Helium is incorrect? It has the highest boiling point of all elements It is used to produce and sustain powerful superconducting magnets It is used as a diluent for oxygen in modern diving apparatus It is a non-inflammable and light gas The solubility of noble gases in water increases down the group. This is due to an increase in: Dipole-induced dipole interactions Ion-dipole interactions Hydrogen bonding Ionization enthalpy The preparation of XeO 3 from XeF 6 involves: Complete hydrolysis Partial hydrolysis Reaction with O 2 Reaction with SiO 2 In the reaction XeF 2 + H 2O → Products , the Xenon-containing product is: Xe XeO 3 XeOF 4 XeO 4 What is the hybridisation of the Xenon atom in XeO 3 ? sp 3 sp 3d sp 3d 2 sp 2 Noble gases can be trapped in the cavities of the crystal lattices of certain organic and inorganic compounds (like quinol). These substances are called: Clathrate compounds Interstitial compounds Complex salts Isomorphous mixtures What is the product formed when Xenon difluoride ( XeF 2 ) is reduced by Hydrogen at 400 C ? Xe + HF XeF 4 + H 2O XeH 2 + F 2 XeO 3 + HF The geometry of XeF 4 according to VSEPR theory is: Square planar Tetrahedral Octahedral Pyramidal Xenon hexafluoride ( XeF 6 ) reacts with silica ( SiO 2 ) to form a colorles volatile liquid X . Identify X : XeOF 4 XeO 3 XeF 2 XeF 4 The reaction of Xenon tetrafluoride ( XeF 4 ) with water at low temperatures leads to the disproportionation of Xenon. The products are: Xe, XeO 3, HF, O 2 Xe, HF, O 2 XeO 3, HF, F 2 XeF 2, XeO 3, HF Xenon fluorides can act as fluoride ion donors when they react with Phosphorus pentafluoride ( PF 5 ). The product of the reaction between XeF 2 and PF 5 is: [XeF] + [PF 6] - [XeF 3] + [PF 4] - XePF 7 [Xe 2F 3] + [PF 6] - Which noble gas has the lowest boiling point of any known substance? Helium Neon Argon Xenon The product of the reaction between XeF 4 and SbF 5 is: [XeF 3] + [SbF 6] - [XeF 5] + [SbF 6] - [XeF 4 A · SbF 5] adduct XeF 2 + SbF 3 + F 2 The species XeF 5 - has which of the following geometries? Pentagonal planar Pentagonal bipyramidal Distorted octahedral Square pyramidal The geometry of Xenon dioxydifluoride ( XeO 2F 2 ) according to VSEPR theory is: Seesaw Square planar Tetrahedral Bent T-shape The product obtained when XeF 4 reacts with SbF 5 is: [XeF 3] +[SbF 6] - [XeF 5] +[SbF 4] - [XeF] +[SbF 6] - XeSbF 9 Helium was first discovered in the: Chromosphere of the Sun Atmosphere of Mars Ocean floor Deep coal mines Radon ( Rn ) is a radioactive noble gas. It is obtained as a decay product of: 226 Ra 238 U 232 Th 40 K The electron gain enthalpy of noble gases is: Positive Highly negative Zero Negative Which noble gas is used in incandescent bulbs to provide an inert atmosphere and prevent the oxidation of the tungsten filament? Argon Helium Neon Xenon Helium is used in the oxygen cylinders of deep-sea divers because: It is much less soluble in blood than Nitrogen at high pressures It is lighter than Nitrogen and easier to carry It reacts with blood to prevent the 'bends' It acts as a catalyst for oxygen absorption