Welcome to your p block elements
1.
P₂O₅ heated with water gives:
2.
Oxy acid forming hydride on heating:
3.
In dilute aqueous solution, nitric acid exists as:
4.
Which of the following is used as rocket fuel?
5.
Which species undergoes reduction in MnO₂ + 4HCl → MnCl₂ + Cl₂ + H₂O?
6.
Standard electrode potential of which is highest positive?
7.
PCl₅ is possible but NCl₅ does not exist because:
8.
Little difference in acidic strengths of H₃PO₄, H₃PO₃, H₃PO₂ because:
9.
Property shared by white & red phosphorus:
10.
Oxy acid forming hydride on heating:
11.
Dinitrogen trioxide is:
12.
In which compound is phosphorus in its lowest oxidation state?
13.
Which of the following is used in smoke screens?
14.
vNaNO₂ gives coloured fumes with dil. acid. Fumes are:
15.
In dilute aqueous solution, nitric acid exists as:
16.
Red phosphorus is less reactive than yellow phosphorus because:
19.
Property shared by white & red phosphorus:
20.
Which of the following is used in smoke screens?
21.
Iron with conc. HNO₃:
22.
Which of the following does not exhibit allotropy?
23.
Molecular formula of white phosphorus:
24.
Which of the following is used as rocket fuel?
25.
The bonds present in N₂O₃ are:
26.
A hydride of nitrogen which is acidic:
27.
N forms NCl₃ but P forms PCl₅ & PCl₃. Why?
28.
Oxy acid forming hydride on heating:
29.
Industrial preparation of nitric acid (Ostwald process) involves:
31.
Dinitrogen trioxide is:
32.
Hydrogen atoms attached to P in hypophosphorous acid:
33.
Ammonia reacts with sodium hypochlorite to give:
34.
Which is NOT a redox reaction?
35.
In which compound is phosphorus in its lowest oxidation state?
36.
The molecular nitrogen is not reactive due to:
37.
Process for separating white P from red P:
38.
The strongest reducing agent among the following is:
39.
Oxidation number of Mn in MnO₄²⁻?
41.
NH₄Cl heated → vapors turn litmus blue then red because of:
42.
Which is used as fertilizer?
43.
“Pearl White” contains an element of VA group. The element used is:
44.
Which does NOT have N–N bond?
45.
Lightning bolts in atmosphere cause the formation of:
