CBSE 12th Standard Chemistry Subject The p-Block Elements Ncert Exemplar 2 Mark Questions 2021
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CBSE 12th Standard Chemistry Subject The p-Block Elements Ncert Exemplar 2 Mark Questions 2021
12th Standard CBSE
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Reg.No. :
Chemistry
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State reasons for each of the following:
(i) All the P-Cl bonds in PCl5 molecule are not equivalent.
(ii) Sulphur has greater tendency for catenation than oxygen.(a) -
Assign a reason for each of the following statements:
(i) More metal fluorides are ionic in nature than metal chlorides.
(ii) SCI6 is not known but SF6 is known.(a) -
Explain why the stability of oxoacids of chlorine increases in the order given below:
HCIO < HCIO2 < HCIO3 < HCIO4(a) -
Write a balanced chemical equation for the reaction showing catalytic oxidation of NH3 by atmospheric oxygen.
(a) -
Write the structure of pyrophosphoric acid.
(a)
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CBSE 12th Standard Chemistry Subject The p-Block Elements Ncert Exemplar 2 Mark Questions 2021 Answer Keys
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(i) it is because all the bonds are not in same plane. Axial bonds are longer than equatorial bonds due to more repulsion.
(ii) It is because of strong S-S bond than O-O due to greater repulsion between valence electrons of smaller atoms of oxygen than sulphur atoms. -
(i) It is due to greater difference in electronegativity in fluorides than in chlorides.
(ii) In SCI6 there is more repulsion than in SF6, therefore, SCI6 does not exist. -
It is due to stability oxo anions follows the following order due to dispersal of charge on more number of electronegative oxygen atoms.
CIO- < CIO2- < CIO3- < CIO4- -
\(4{ NH }_{ 3 }+5{ O }_{ 2 }\xrightarrow [ 500K,9bar ]{ Pt/Rh\ gauze,catalyst } 4NO+6{ H }_{ 2 }O\)
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\(HO-\overset { \underset { \parallel }{ O } }{ \underset { \overset { | }{ HO } }{ P } } -O-\overset { \underset { \parallel }{ O } }{ \underset { \overset { | }{ OH } }{ P } } -OH\) Pyrophosphoric \(\left( { H }_{ 4 }{ P }_{ 2 }{ O }_{ 7 } \right) \) acid
