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3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Match the compounds given in Column I with the hybridisation and shape given in Column II and mark the correct option
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Payal Gupta

Contributor-Level 10

This is a matching answer type question as classified in NCERT Exemplar

Correct option is (i)

In XeF6, the central Xe atom undergoes sp3d3 hybridisation and the molecular geometry is distorted octahedral with 1 lone pair and 6 bond pairs of electrons.

In XeO3, the central Xe atom undergoes sp3 hybridisation and the molecular geometry is pyramidal with 1 lone pair and 3 bonding domains of electrons.

In XeOF4, the central Xe atom undergoes sp3d2 hybridization and the molecular geometry is square pyramidal with 1 lone pair and 5 bond pairs of electrons.

In XeF4, the central Xe atom undergoes&nb

...more

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Assertion : SF6 cannot be hydrolysed but SF4 can be. 

Reason : Six F atoms in SF6 prevent the attack of H2O on sulphur atom of SF6

(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.
0 Follower 3 Views

P
Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

Correct option is (i)Here,  the S atom is surrounded by 6F atoms,  so it's complected for H2O to attack SF6,  but in case of SF4,  it's surrounded by 4F atoms,  so it's to attack H2O.

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Assertion : NaCl reacts with concentrated H2SO4 to give colourless fumes with pungent smell. But on adding MnO2 the fumes become greenish yellow. 

Reason : MnO2 oxidises HCl to chlorine gas which is greenish yellow.

(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 reaso

...more
0 Follower 5 Views

P
Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

Correct option is (i)

When NaCl reacts with concentrated H2SO4,  it produces colourless fumes with a pungent smell,  but when MnO2 is added, the fumes turn greenish yellow. MnO2 oxidizes HCl to chlorine gas,  which then turns greenish yellow.

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Assertion : Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O2 . 

Reason : Oxygen forms pπ – pπ multiple bonds due to small size and small bond length Pπ- Pπ  bonding is not possible in sulphur.

(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 st

...more
0 Follower 5 Views

P
Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

Correct option is (i)

The rhombic and the monoclinic forms of sulphur exist as S8 . Oxygen forms a p\pi   -  p\pi  multiple bond due to its small size and short bond length,  but Pπ- Pπ bonding is not possible because of sulphur's larger atomic size.

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Assertion : HI cannot be prepared by the reaction of KI with concentrated H2SO4

Reason : HI has lowest H–X bond strength among halogen acids

(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.
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

Correct option is (ii)

Because H2SO4 is a stronger oxidising agent and HI is a stronger reducing agent,  H2SO4 oxidizes and is reduced to SO2.

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

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.
0 Follower 1 View

P
Payal Gupta

Contributor-Level 10

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.

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

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

...more
0 Follower 3 Views

P
Payal Gupta

Contributor-Level 10

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,  phosphor has bonds with unstable angles strains compared to nitrogen,  therefore it burns quickly,  thus readily reacts. Nitrogen has a lower electron gain enthalpy than phosphorus.

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

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.
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

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.

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

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
0 Follower 3 Views

P
Payal Gupta

Contributor-Level 10

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 SO2.

The oxidation state of sulphur's core atom drops from +6 to +4. It oxidises copper in (iii) and is reduced to SO2.

 

New answer posted

3 months ago

P Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

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.
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

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 preparation of SO3 by catalytic oxidation of SO2.

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