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P Block Elements

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New answer posted

11 months ago

P Block Elements Class 12th

Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

Pyrophosphorous acid = H4P2O5

 Hypophosphorous acid = H4P2O6

 Phosphoric acid = H3PO4

 Pyrophosphoric acid = H4P2O7

New answer posted

11 months ago

P Block Elements Class 12th

When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Cobalt (II) meta borate is a blue colour of Bead.

New answer posted

11 months ago

P Block Elements Class 12th

Portland cement contains 'X' to enhance the setting time. What is 'X'?
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Here 'X' is the Gypsum (CaSO4.2H2O) which is used to enhance the setting of time

 

New answer posted

11 months ago

P Block Elements Class 12th

Given below are two statements.

Statement I: Stannane is an example of a molecular hydride.

Statement II: Stannane is a planar molecule.

In the light of the above statement, choose the most appropriate answer from the options given below.
0 Follower 5 Views

A
alok kumar singh

Contributor-Level 10

Stannane is the tetrahedral shape of molecule.

Hybridisation is- sp3, shape and structure are tetrahedral

 

New answer posted

11 months ago

P Block Elements Class 12th

Match List-I with List-II

List – I

List – II

(A)

4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g)

(I)

NO(g)

(B)

N2(g) + 3H2(g) -> 2NH3(g)

(II)

H2SO4(I)

(C)

C12H22O11(aq) + H2O(I) -> C6H12O6 + C6H12O6

                                              Glucose     Fructose    

(III)

Pt(s)

(D)

2SO2(g) + O2(g) -> 2SO3(g)

(IV)

Fe(s)

           Choose the correct answer from the options given below
0 Follower 6 Views

V
Vishal Baghel

Contributor-Level 10

(a) Nitric oxide formation -> Pt is used as catalyst

(b) Haber's process -> Fe is used as catalyst

(c) Hydrolysis of ester -> Acid (H2SO4) is used as catalyst

(d) SO3 formation -> NO is used as catalyst

New answer posted

11 months ago

P Block Elements Class 12th

Consider the following sulphur based oxoacids.

H2SO3, H2SO4, H2S2O8 and H2S2O7.

Amongst these oxoacids, the number of those with peroxo (O-O) bond is______________.
0 Follower 3 Views

A
alok kumar singh

Contributor-Level 10

Only H2S2O8 has per-oxo bond.

 

New answer posted

11 months ago

P Block Elements Class 12th

The sum of number of lone pairs of electrons present on the central atoms of XeO3, XeOF4 and XeF6, is___________.
0 Follower 7 Views

P
Payal Gupta

Contributor-Level 10

XeO3 ⇒ Number of lone pair = 1

XeOF4 ⇒ Number of lone pair = 1

XeF6 ⇒ Number of lone pair = 1

New answer posted

11 months ago

P Block Elements Class 12th

Consider the following sulphur based oxoacids.

H2SO3, H2SO4, H2S2O8 and H2S2O7.

Amongst these oxoacids, the number of those with peroxo (O-O) bond is______________.
0 Follower 4 Views

P
Payal Gupta

Contributor-Level 10

Only H2S2O8 has per-oxo bond.

New answer posted

11 months ago

P Block Elements Class 12th

The number of interhalogens from the following having square pyramidal structure is:

CIF3, IF7, BrF5, BrF3, I2Cl6, IF5, ClF, ClF5
0 Follower 4 Views

V
Vishal Baghel

Contributor-Level 10

  C l F 3 -> T-shaped (sp3d)

 IF7 -> Pentagonal bipyramidal (sp3d3)

BrF5 -> Square pyramidal (sp3d2)

BrF3 -> T-Shaped (sp3d)

I2Cl6 -> Triangular bipyramidal (sp3d)

I F 5 → Square Pyramidal (sp3d2)

ClF -> (sp3)

ClF5 -> Square Pyramidal (sp3d2)

Br5, IF5 & ClF5 -> Square Pyramidal

New answer posted

11 months ago

P Block Elements Class 12th

Among the given oxides of nitrogen ; N2O, N2O3, N2O4 and N2O5, the number of compound / (s) having N – N bond is:
0 Follower 16 Views

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

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