Welcome to your p block elements
1.
Lightning bolts in atmosphere cause the formation of:
2.
Which of the following is used as rocket fuel?
3.
Hydrogen atoms attached to P in hypophosphorous acid:
4.
Which is NOT a redox reaction?
5.
The strongest reducing agent among the following is:
6.
Oxidation number of Mn in MnO₄²⁻?
7.
Oxy acid forming hydride on heating:
8.
In dilute aqueous solution, nitric acid exists as:
9.
Which does NOT have N–N bond?
10.
Oxy acid forming hydride on heating:
11.
Which of the following is used as rocket fuel?
12.
P₂O₅ heated with water gives:
14.
Which of the following does not exhibit allotropy?
15.
Standard electrode potential of which is highest positive?
17.
PCl₅ is possible but NCl₅ does not exist because:
18.
Molecular formula of white phosphorus:
19.
Dinitrogen trioxide is:
20.
The bonds present in N₂O₃ are:
22.
In which compound is phosphorus in its lowest oxidation state?
23.
“Pearl White” contains an element of VA group. The element used is:
24.
Oxy acid forming hydride on heating:
25.
Process for separating white P from red P:
26.
Which species undergoes reduction in MnO₂ + 4HCl → MnCl₂ + Cl₂ + H₂O?
28.
Property shared by white & red phosphorus:
29.
Industrial preparation of nitric acid (Ostwald process) involves:
30.
Red phosphorus is less reactive than yellow phosphorus because:
31.
Which of the following is used in smoke screens?
32.
The molecular nitrogen is not reactive due to:
33.
Property shared by white & red phosphorus:
34.
In dilute aqueous solution, nitric acid exists as:
35.
In which compound is phosphorus in its lowest oxidation state?
36.
A hydride of nitrogen which is acidic:
37.
Dinitrogen trioxide is:
38.
NH₄Cl heated → vapors turn litmus blue then red because of:
39.
Ammonia reacts with sodium hypochlorite to give:
40.
Which is used as fertilizer?
41.
Which of the following is used in smoke screens?
42.
Little difference in acidic strengths of H₃PO₄, H₃PO₃, H₃PO₂ because:
43.
N forms NCl₃ but P forms PCl₅ & PCl₃. Why?
44.
Iron with conc. HNO₃:
45.
vNaNO₂ gives coloured fumes with dil. acid. Fumes are:
