P Block Elements
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The oxidation state of central atom in the anion of compound NaH2PO2 will be ______.
(i) +3
(ii) +5
(iii) +1
(iv) –3
The oxidation state of central atom in the anion of compound NaH2PO2 will be ______.
(i) +3
(ii) +5
(iii) +1
(iv) –3
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
Upvote 
In the preparation of HNO3, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH3 will be______.
(i) 2
(ii) 3
(iii) 4
(iv) 6
In the preparation of HNO3, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH3 will be______.
(i) 2
(ii) 3
(iii) 4
(iv) 6
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 p
Upvote On heating ammonium dichromate and barium azide separately we get
(i) N2 in both cases
(ii) N2 with ammonium dichromate and NO with barium azide
(iii) N2O with ammonium dichromate and N2 with barium azide
(iv) N2O with ammonium dichromate and NO2 with barium azide
On heating ammonium dichromate and barium azide separately we get
(i) N2 in both cases
(ii) N2 with ammonium dichromate and NO with barium azide
(iii) N2O with ammonium dichromate and N2 with barium azide
(iv) N2O with ammonium dichromate and NO2 with barium azide
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.
Upvote Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is
(i) Bi2O5
(ii) BiF5
(iii) BiCl5
(iv) Bi2S5
Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is
(i) Bi2O5
(ii) BiF5
(iii) BiCl5
(iv) Bi2S5
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.
Upvote A brown ring is formed in the ring test for NO3- ion. It is due to the formation of
(i) [Fe(H2O)5(NO)]2+
(ii) FeSO4 .NO2
(iii) [Fe(H2O)4(NO)2]2+
(iv) FeSO4.HNO3
A brown ring is formed in the ring test for NO3- ion. It is due to the formation of
(i) [Fe(H2O)5(NO)]2+
(ii) FeSO4 .NO2
(iii) [Fe(H2O)4(NO)2]2+
(iv) FeSO4.HNO3
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
Upvote Which of the following statements is wrong?
(i) Single N–N bond is stronger than the single P–P bond.
(ii) PH3 can act as a ligand in the formation of coordination compound with transition elements.
(iii) NO2 is paramagnetic in nature.
(iv) Covalency of nitrogen in N2O5 is four
Which of the following statements is wrong?
(i) Single N–N bond is stronger than the single P–P bond.
(ii) PH3 can act as a ligand in the formation of coordination compound with transition elements.
(iii) NO2 is paramagnetic in nature.
(iv) Covalency of nitrogen in N2O5 is four
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i)
The N-N sigma bond (single bond) is weaker than the P-P sigma bond (single bond) due to the smaller size of nitrogen which increases the interelectronic repulsions and thus making the bond weaker.
Upvote Maximum covalency of nitrogen is ______________.
(i) 3
(ii) 5
(iii) 4
(iv) 6
Maximum covalency of nitrogen is ______________.
(i) 3
(ii) 5
(iii) 4
(iv) 6
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (ii)
The valence electrons of nitrogen are two 2s and three 2p. Nitrogen can make three covalent bonds by sharing its three 2p electrons. Consider the NH3 molecule. The nitrogen atom, however, still contains a lone
Upvote Which of the following elements does not show allotropy?
(i) Nitrogen
(ii) Bismuth
(iii) Antimony
(iv) Arsenic
Which of the following elements does not show allotropy?
(i) Nitrogen
(ii) Bismuth
(iii) Antimony
(iv) Arsenic
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (i)
The single N-N bond is weak because of high interelectronic repulsion of the non-bonding electrons, owing to the small bond length. As a result the catenation tendency is weaker in nitrogen that is why it
Upvote On heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are ______.
(i) N2O, PbO
(ii) NO2, PbO
(iii) NO, PbO
(iv) NO, PbO2
On heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are ______.
(i) N2O, PbO
(ii) NO2, PbO
(iii) NO, PbO
(iv) NO, PbO2
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (ii)
On heating, lead nitrate decomposes into lead monoxide, nitrogen dioxide, and oxygen.
2Pb (NO3)2→2PbO + 4NO2 + O2.
Upvote Strong reducing behaviour of H3PO2 is due to
(i) Low oxidation state of phosphorus
(ii) Presence of two –OH groups and one P–H bond
(iii) Presence of one –OH group and two P–H bonds
(iv) High electron gain enthalpy of phosphorus
Strong reducing behaviour of H3PO2 is due to
(i) Low oxidation state of phosphorus
(ii) Presence of two –OH groups and one P–H bond
(iii) Presence of one –OH group and two P–H bonds
(iv) High electron gain enthalpy of phosphorus
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (iii)
H3PO2 has one O-H group and two P-H bonds
The existence of a P-H link gives phosphorus oxyacids their reducing characteristics. It has a strong proclivity for releasing protons. As a result, it demonstrates a
Upvote