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.
15
MCQ (Single Correct Answer)
A brown ring is formed in the ring test for $\mathrm{NO}_3^{-}$ion. It is due to the formation of
A
$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5(\mathrm{NO})\right]^{2+}$
B
$\mathrm{FeSO}_4 \cdot \mathrm{NO}_2$
C
$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_4(\mathrm{NO})_2\right]^{2+}$
D
$\mathrm{FeSO}_4 \cdot \mathrm{HNO}_3$
16
MCQ (Single Correct Answer)
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
A
$\mathrm{Bi}_2 \mathrm{O}_5$
B
$\mathrm{BiF}_5$
C
$\mathrm{BiCl}_5$
D
$\mathrm{Bi}_2 \mathrm{S}_5$
17
MCQ (Single Correct Answer)
On heating ammonium dichromate and barium azide separately we get
A
$\mathrm{N}_2$ in both cases
B
$\mathrm{N}_2$ with ammonium dichromate and NO with barium azide
C
$\mathrm{N}_2 \mathrm{O}$ with ammonium dichromate and $\mathrm{N}_2$ with barium azide
D
$\mathrm{N}_2 \mathrm{O}$ with ammonium dichromate and $\mathrm{NO}_2$ with barium azide
18
MCQ (Single Correct Answer)
In the preparation of $\mathrm{HNO}_3$, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of $\mathrm{NH}_3$ will be ............ .
A
2
B
3
C
4
D
6