Ncert Solutions Chemistry Class 12th

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.

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 > H₂Te is the order of thermal stability

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.

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.

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.

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=20 valence electrons.

As a result, each P atom will have one lone pair of electrons, and each covalent bond (two electrons) will be established.

In a molecule of white phosphorus, there will be four lone pairs of electrons and six P-P single bonds in total.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (ii), (iii)

MI  >  MBr  >  MCl  >  MF is an iconic character of metal halide

F₂ >  Cl₂ >  Br₂ > I₂ is a bond dissociation enthalpy

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (i) and (iii)

6NaOH+3Cl₂ → 5NaCl+NaClO₃+3H₂O

Chlorine gas oxidation number ranges from 0 to –1 to 0 to +5.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (ii)

BrO₂^- (35+2*8+1=52) and BrF₂⁺  (35+2*9−1=52)

52 electrons are present in both 

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (iii)

The ability of a substance to be decreased is known as its reduction potential. As the substance's reduction potential rises, so does its power to reduce. It signifies the chemical's oxidising power (the ability of the material to cause other substances to lose electrons, which is known as oxidising power) grows.

As a result, the oxidising power is listed in decreasing order BrO₄^-  >  IO₄^-  >  ClO₄^-