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
19
MCQ (Single Correct Answer)
The oxidation state of central atom in the anion of compound $\mathrm{NaH}_2 \mathrm{PO}_2$ will be ........... .
A
+3
B
+5
C
+1
D
$-$3
20
MCQ (Single Correct Answer)
Which of the following is not tetrahedral in shape?
A
$\mathrm{NH}_4^{+}$
B
$\mathrm{SiCl}_4$
C
$\mathrm{SF}_4$
D
$\mathrm{SO}_4{ }^{2-}$