P Block Elements

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (iii)

Bartlett noticed that Xenon's first ionisation potential is nearly identical to that of oxygen and used Born-Haber calculations to predict the presence of a stable compound: Xe⁺ Pt F₆^- 

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (iv)

MnO₂ ( Black )+4HCl→MnCl₂+2H₂O+Cl₂

Greenish yellow color

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (iii)

C+2H₂SO₄→CO₂+2SO₂+2H₂O

Conc. H₂SO₄ oxidises C to produce two gaseous products.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (i)

Peroxy linkage refers to the presence of a bond between oxygen and oxygen (O-O) in a molecule.

Only H₂S₂O₆ and H₂S₂O₇ of the sulphur oxoacids above have a peroxy linkage.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (iii)

The C-atom in the CO₃^2-  ion undergoes sp2 hybridization. BF₄, NH₄⁺  and SO₄^2-  have a tetrahedral structure, whereas it has a triangular planar structure.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (iii)

Na (H₂)PO₂

1+ (2x+1)+ x +2 (−2)=0

x−1=0

x=1

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (i)

The catalytic oxidation of ammonia produces NO gas, which is used to make HNO₃. 4 moles of NH₃ created 4 moles of NO in the equation below. As a result, the moles of NO produced by oxidising two moles of NH₃ will be two moles.

4NH₃ + 5O₂→4NO + 6H₂O.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (i)

We get N₂ in both situations when we heat ammonium dichromate and barium azide separately.

(NH₄)2Cr₂O₇→Cr₂O₃ + 4H₂O + N₂

Ba (N₃)₂→Ba + 3N₂.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (ii)

Bismuth is the sole element that has an inert pair effect. Only generates trihalides and has a +3 oxidation state. Florine, on the other hand, is small and has a high electronegativity.

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (i)

The 'Brown Ring Test' is an identification and conformation test of the nitrate ion  (NO₃^- ) using conc. H₂SO₄ and newly produced FeSO₄. Place the NO₃^-  containing sample in a test tube. Then, with gentle shaking, add conc H₂SO₄ dropwise, heat it briefly on a Bunsen burner, and add freshly made greenish FeSO4 Then, due to the creation of brown coloured  [Fe (H₂O)₅ (NO)]SO₄ complex, a brown ring forms in that test tube.