10
MCQ (Single Correct Answer)
Strong reducing behaviour of $\mathrm{H}_3 \mathrm{PO}_2$ is due to
A
low oxidation state of phosphorus
B
presence of two -OH groups and one $\mathrm{P}-\mathrm{H}$ bond
C
presence of one -OH group and two $\mathrm{P}-\mathrm{H}$ bonds
D
high electron gain enthalpy of phosphorus
11
MCQ (Single Correct Answer)
On heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are ............. .
A
$\mathrm{N}_2 \mathrm{O}, \mathrm{PbO}$
B
$\mathrm{NO}_2, \mathrm{PbO}$
C
$\mathrm{NO}, \mathrm{PbO}$
D
$\mathrm{NO}, \mathrm{PbO}_2$
12
MCQ (Single Correct Answer)
Which of the following elements does not show allotropy?
A
Nitrogen
B
Bismuth
C
Antimony
D
Arsenic
13
MCQ (Single Correct Answer)
Maximum covalency of nitrogen is ............ .
A
3
B
5
C
4
D
6
14
MCQ (Single Correct Answer)
Which of the following statements is wrong?
A
Single $\mathrm{N} — \mathrm{~N}$ bond is stronger than the single $\mathrm{P} — \mathrm{P}$ bond.
B
$\mathrm{PH}_3$ can act as a ligand in the formation of coordination compound with transition elements.
C
$\mathrm{NO}_2$ is paramagnetic in nature.
D
Covalency of nitrogen in $\mathrm{N}_2 \mathrm{O}_5$ is four.