Welcome to your p block elements
1.
Oxidation number of Mn in MnO₄²⁻?
2.
Molecular formula of white phosphorus:
3.
Property shared by white & red phosphorus:
4.
Standard electrode potential of which is highest positive?
5.
Which of the following is used as rocket fuel?
6.
“Pearl White” contains an element of VA group. The element used is:
7.
Hydrogen atoms attached to P in hypophosphorous acid:
8.
Which species undergoes reduction in MnO₂ + 4HCl → MnCl₂ + Cl₂ + H₂O?
9.
Which is used as fertilizer?
10.
Dinitrogen trioxide is:
11.
Lightning bolts in atmosphere cause the formation of:
12.
In which compound is phosphorus in its lowest oxidation state?
13.
Which is NOT a redox reaction?
14.
In dilute aqueous solution, nitric acid exists as:
15.
Which of the following does not exhibit allotropy?
16.
Oxy acid forming hydride on heating:
17.
P₂O₅ heated with water gives:
18.
Oxy acid forming hydride on heating:
19.
In which compound is phosphorus in its lowest oxidation state?
20.
Red phosphorus is less reactive than yellow phosphorus because:
21.
Ammonia reacts with sodium hypochlorite to give:
22.
A hydride of nitrogen which is acidic:
23.
Property shared by white & red phosphorus:
24.
NH₄Cl heated → vapors turn litmus blue then red because of:
25.
Little difference in acidic strengths of H₃PO₄, H₃PO₃, H₃PO₂ because:
26.
PCl₅ is possible but NCl₅ does not exist because:
27.
Oxy acid forming hydride on heating:
28.
Which of the following is used as rocket fuel?
30.
The bonds present in N₂O₃ are:
31.
Industrial preparation of nitric acid (Ostwald process) involves:
32.
Which does NOT have N–N bond?
35.
The molecular nitrogen is not reactive due to:
36.
vNaNO₂ gives coloured fumes with dil. acid. Fumes are:
38.
Which of the following is used in smoke screens?
39.
In dilute aqueous solution, nitric acid exists as:
40.
The strongest reducing agent among the following is:
41.
Which of the following is used in smoke screens?
42.
Process for separating white P from red P:
43.
N forms NCl₃ but P forms PCl₅ & PCl₃. Why?
44.
Dinitrogen trioxide is:
45.
Iron with conc. HNO₃:
