Which of the following oxyacid contains both P-H and P-P bond simultaneously?

1. H4P2O5

2. H4P2O7

3. H4P2O6

4. None

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In which process does the nitrogen undergo oxidation?

(1) N2 2NH3

(2) N2O 2NO2

(3) NO3 N2O5

(4) NO2NO3-

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B(OH)3 + NaOH   NaBO2 + Na[B(OH)4] +H2O

How can this reaction is made to proceed in forward direction?

(a) addition of cis 1,2 diol

(b) addition of borax

(c) addition of trans 1,2 diol

(d) addition of Na2HPO4

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Which of the following has been arranged in order of decreasing bond dissociation energy:

(1) P-O>Cl-O>S-O

(2) P-O>S-O>Cl-O

(3) S-O>Cl-O>P-O

(4) Cl-O>S-O>P-O

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Among the following compounds, which on heating do not produce N2?

(1) (NH4)2Cr2O7

(2) NH4Cl+NaNO2

(3) NH4Cl+CaO

(4) Ba(N3)2

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Incorrectly matched characteristic is:

1. S8: covalent lattice

2. P4: tetrahedron

3. S52-: zigzag

4. SiO2: Covalent lattice

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group 16,preparation and properties
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Which of the following is the correct statement?

(1) F2 has higher dissociation energy than Cl2

(2) F has higher electron affinity than Cl

(3) HF is stronger acid than HCl

(4) Boiling point increases down the group in halogens

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Partial Hydrolysis of one mole of peroxodi-sulphuric acid produces:

(1) two moles of sulphuric acid

(2) two moles of peroxomono-sulphuric acid

(3) one mole of sulphuric acid, one mole of peroxomono-sulphuric acid

(4) one mole of sulphuric acid, one mole of peroxomono-sulphuric acid and one mole of hydrogen peroxide

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Concentrated nitric acid reacts with iodine to give:

(1) HOI

(2) HI

(3) HIO3

(4) HIO4

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The formation of PH4+ is difficult compared to NH4+ because

1. lone pair of phosphorous is optically inert

2. lone pair of phosphorous resides in almost pure p- orbital

3. lone pair of phosphorous resides at sp3 orbital

4. lone pair of phosphorous resides in almost pure s- orbital

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