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Practice each question, then open the answer or worked solution.
If chlorine gas is passed through a hot NaOH solution, two changes are observed
in the oxidation number of chlorine during the reaction. These are ________
and _________.
(i) 0 to +5
(ii) 0 to +3
(iii) 0 to –1
(iv) 0 to +1
Option (i) and (iii) are the answers.
Which of the following options are not in accordance with the property
mentioned against them?
(i) F2> Cl2> Br2> I2 Oxidising power.
(ii) MI > MBr > MCl > MF Ionic character of metal halide.
(iii) F2> Cl2> Br2> I2 Bond dissociation enthalpy.
(iv) HI < HBr < HCl < HF Hydrogen-halogen bond strength.
Option (ii) and (iii) are the answers
Which of the following is correct for P4 the molecule of white phosphorus?
(i) It has 6 lone pairs of electrons.
(ii) It has six P–P single bonds.
(iii) It has three P–P single bonds.
(iv) It has four lone pairs of electrons.
Option (ii) and (iv) are the answers.
Which of the following statements are correct?
(i) Among halogens, radius ratio between iodine and fluorine is maximum.
(ii) Leaving F—F bond, all halogens have weaker X—X bond than X—X’
bond in interhalogens.
(iii) Among interhalogen compounds, the maximum number of atoms are present
in iodine fluoride.
(iv) Interhalogen compounds are more reactive than halogen compounds.
Option (i), (iii) and (iv) are the answers.
Which of the following statements are correct for SO2 gas?
(i) It acts as a bleaching agent in moist conditions.
(ii) Its molecule has linear geometry.
(iii) It’s dilute solution is used as a disinfectant.
(iv) It can be prepared by the reaction of dilute H2SO4
with metal sulphide.
Option (i) and (iii) are the answers.
Which of the following statements are correct?
(i) All three N—O bond lengths in HNO3 are equal.
(ii) All P—Cl bond lengths in PCl5 molecule in the gaseous state are equal.
(iii) P4 molecule in white phosphorus have angular strain therefore white
phosphorus is very reactive.
(iv) PCl is ionic in the solid-state in which cation is tetrahedral and the anion is
octahedral.
Option (iii) and (iv) are the answers.
Which of the following orders are correct as per the properties mentioned against
each?
(i) As2O3< SiO2< P2O3< SO2 Acid strength.
(ii) AsH3< PH3< NH3 Enthalpy of vaporization.
(iii) S < O < Cl < F More negative electron gain enthalpy.
(iv) H2O > H2S > H2Se > H2Te Thermal stability.
Option (i) and (iv) are the answers.
Which of the following statements are correct?
(i) S–S bond is present in H2S2O6
(ii) In peroxosulphuric acid (H2SO5) sulphur is in +6 oxidation state.
(iii) Iron powder along with Al2O3 and K2O is used as a catalyst in the preparation of NH3
by Haber’s process.
(iv) Change in enthalpy is positive for the preparation of SO3
by catalytic oxidation of SO2
Option (i) and (ii) are the answers.
In which of the following reactions conc. H2SO4 is used as an oxidising reagent?
(i) CaF2+ H2SO4 → CaSO4+ 2HF
(ii) 2HI + H2SO4 → I2 + SO2+ 2H2O
(iii) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
(iv) NaCl + H2SO4 → NaHSO4 + HCl
Option (ii) and (iii) are the answers.
Which of the following statements are true?
(i) The only type of interactions between particles of noble gases is due to
weak dispersion forces.
(ii) Ionisation enthalpy of molecular oxygen is very close to that of xenon.
(iii) Hydrolysis of XeF6
is a redox reaction.
(iv) Xenon fluorides are not reactive.
Option (i) and (ii) are the answers.
III. Short Answer Type