P Block Elements
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Assertion : HNO3 makes iron passive.
Reason : HNO3 forms a protective layer of ferric nitrate on the surface of iron.
(i) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(ii) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
(iii) Assertion is correct, but reason is wrong statement.
(iv) Assertion is wrong but reason is correct statement.
(v) Both assertion and reason are wrong statements.
Assertion : HNO3 makes iron passive.
Reason : HNO3 forms a protective layer of ferric nitrate on the surface of iron.
(i) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(ii) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
(iii) Assertion is correct, but reason is wrong statement.
(iv) Assertion is wrong but reason is correct statement.
(v) Both assertion and reason are wrong statements.
This is a assertion and reason answer type question as classified in NCERT Exemplar
Correct option is (iii)
HNO3 forms an oxide layer on the surface of iron. This is also known as corrosion or rusting.
Upvote 
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : N2 is less reactive than P4.
Reason : Nitrogen has more electron gain enthalpy than phosphorus.
(i) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(ii) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
(iii) Assertion is correct, but reason is wrong statement.
(iv) Assertion is wrong but reason is correct statement.
(v) Both assertion and reason are wrong statements.
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : N2 is less reactive than P4.
Reason : Nitrogen has more electron gain enthalpy than phosphorus.
(i) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(ii) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
(iii) Assertion is correct, but reason is wrong statement.
(iv) Assertion is wrong but reason is correct statement.
(v) Both assertion and reason are wrong statements.
This is a assertion and reason answer type question as classified in NCERT Exemplar
Correct option is (iii)
Nitrogen gas has a complete octet structure for both atoms and is unreactive due to the presence of a strong triple bond. On the other hand, ph
Upvote Which of the following statements are true?
(i) Only type of interactions between particles of noble gases are 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.
Which of the following statements are true?
(i) Only type of interactions between particles of noble gases are 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.
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i) and (ii)
(i) The modest dispersion force causes attraction in noble gases.
(ii) In nature, xenon fluorides are reactive.
Upvote 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
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
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (ii) and (iii)
Here fig (b) contains one S-S bond.
The oxidising behaviour of H2SO4 is represented by (ii) and (iii) among the aforementioned four. It oxidises HI in reaction (ii) and then reduces to&
Upvote Which of the following statements are correct?
(i) S–S bond is present in H2S2O6.
(ii) In peroxosulphuric acid H2SO4 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.
Which of the following statements are correct?
(i) S–S bond is present in H2S2O6.
(ii) In peroxosulphuric acid H2SO4 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.
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i)
Oxidation state of S=+6
(iii) Iron oxide with K2O and Al2O3 is used to increase the rate of attainment of equilibrium in Haber's process.
(iv) Change in enthalpy is negative for the preparat
Upvote 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 vapourisation.
(iii) S< O < Cl < F More negative electron gain enthalpy.
(iv) H2O > H2S > H2Se > H2Te Thermal stability.
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 vapourisation.
(iii) S< O < Cl < F More negative electron gain enthalpy.
(iv) H2O > H2S > H2Se > H2Te Thermal stability.
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i) and (iv)
(i) As2O3 < SiO2 < P2O3 < SO2 is the order of acid
(ii) AsH3 < PH3 < NH3 is the correct or enthalpy of vapourization
(iii) S < O < F < Cl is the correct order of more negative gain enthalpy
(iv) H2O > H2Se >
Upvote Which of the following statements are correct?
(i) All the three N—O bond lengths in HNO3 are equal.
(ii) All P—Cl bond lengths in PCl5 molecule in gaseous state are equal.
(iii) P4 molecule in white phosphorus have angular strain therefore white phosphorus is very reactive.
(iv) PCl is ionic in solid state in which cation is tetrahedral and anion is octahedral.
Which of the following statements are correct?
(i) All the three N—O bond lengths in HNO3 are equal.
(ii) All P—Cl bond lengths in PCl5 molecule in gaseous state are equal.
(iii) P4 molecule in white phosphorus have angular strain therefore white phosphorus is very reactive.
(iv) PCl is ionic in solid state in which cation is tetrahedral and anion is octahedral.
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (iii) and (iv)
The P4 molecule in white phosphorus has an angular strain, white phosphorus is very reactive.
PCl5 is ionic in the solid state, with a tetrahedral cation and an octahedral anion.
Upvote Which of the following statements are correct for SO2 gas?
(i) It acts as a bleaching agent in moist conditions.
(ii) It’s molecule has linear geometry.
(iii) It’s dilute solution is used as disinfectant.
(iv) It can be prepared by the reaction of dilute H2SO4 with metal sulphide.
Which of the following statements are correct for SO2 gas?
(i) It acts as a bleaching agent in moist conditions.
(ii) It’s molecule has linear geometry.
(iii) It’s dilute solution is used as disinfectant.
(iv) It can be prepared by the reaction of dilute H2SO4 with metal sulphide.
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i) and (iii)
SO2 is employed as an antichlor, disinfectant, and preservative in the bleaching of wool and silk.
Upvote Which of the following statements are correct?
(i) Among halogens, the radius ratio between iodine and fluorine is maximum.
(ii) Leaving the F—F bond, all halogens have weaker X—X bonds than X—X'bonds in interhalogens.
(iii) Among interhalogen compounds maximum number of atoms are present in iodine fluoride.
(iv) Interhalogen compounds are more reactive than halogen compounds.
Which of the following statements are correct?
(i) Among halogens, the radius ratio between iodine and fluorine is maximum.
(ii) Leaving the F—F bond, all halogens have weaker X—X bonds than X—X'bonds in interhalogens.
(iii) Among interhalogen compounds maximum number of atoms are present in iodine fluoride.
(iv) Interhalogen compounds are more reactive than halogen compounds.
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i)
Due to its high electronegativity and tiny size, F is the only interhalogen with weaker X-X’ bonds and no X-X bonds.
Upvote Which of the following is correct for P4 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.
Which of the following is correct for P4 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.
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (ii) and (iv)
Tetrahedral geometry characterises the structure of a white phosphorus molecule.
Phosphorus has a valency of 5, and there are four phosphorus atoms in total. As a result, there will be a total of 4×5=2
Upvote