NEET Chemistry Questions: P block elements - XII

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The species that does not contain peroxide ions is:





(a) PbO2 does not contain -O-O- bond. It is lead dioxide.

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





 PH3..+H+ PH4+

According to Drago's rule lone pair on phosphorous resides in almost pure s- orbital, hence due to non directional nature, its overlapping tendency is greatly reduced in comparison to a lone pair present in hybrid orbital, which is directional as present in NH3..

Concentrated nitric acid reacts with iodine to give:





I2 + 10HNO3   2HIO3 + 10NO2 + 4H20

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





The partial hydrolysis of one mole of peroxodisulfuric acid (H2S2O8) produces one mole of sulfuric acid (H2SO4) and one mole of peroxomonosulfuric acid (H2SO5). The reaction is: H2S2O8 + H2O → H2SO4 + H2SO5.

Which of the following is the correct statement?





-Bond dissociation energy of F2 is less than that of Cl2

-Cl has higher E.A. than fluorine

-HF is weaker acid than HCl, due to higher bond energy

Incorrectly matched characteristic is:





No explanation available.

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





(c) NH4Cl+ NaNO2→NH4NO2+NaCl
NH4NO2  N2↑ +2H2O

Ba(N3)2 →Ba+3N2↓ 
2NH4Cl+CaO→CaCl2+2NH3↑+H2O)

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





No explanation available.

In which process does the nitrogen undergo oxidation?





N+3O2-OxidationN+5O3-

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

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





(a) H3BO3 acts as weak monobasic Lewis acid.

(i) B(OH)3 + NaOH  Na[B(OH)4

on addition of cis 1,2 diol in H3bo3 solution, acidic strength of H3BO3 increases due to chelation effect.

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





Bond dissociation energy 1Bond Length

Order of bond length: P-O > S-O >Cl- O Order of BDE: Cl-O> S-O>P-O

NO2 is the anhydride of





(3) 2NO2+H2OHNO3+HNO2

When PCl3 is hydrolysed then oxyacid of phosphrous is obtained.The basicity of oxyacid is





(2) PCl3+3H2OH3PO3+3HClH3PO3 is a diabasic acid.

Which set of oxide of nitrogen is paramagnetic in nature?





 NO  and NO2 are paramagnetic in nature

S-S bond is present in





No explanation available.