Welcome to your p block elements
1.
Hydrogen atoms attached to P in hypophosphorous acid:
2.
vNaNO₂ gives coloured fumes with dil. acid. Fumes are:
3.
Molecular formula of white phosphorus:
4.
Which of the following is used in smoke screens?
5.
Which is used as fertilizer?
6.
Standard electrode potential of which is highest positive?
7.
Which species undergoes reduction in MnO₂ + 4HCl → MnCl₂ + Cl₂ + H₂O?
8.
Lightning bolts in atmosphere cause the formation of:
9.
Oxy acid forming hydride on heating:
10.
Industrial preparation of nitric acid (Ostwald process) involves:
11.
Which of the following is used in smoke screens?
12.
Process for separating white P from red P:
13.
In which compound is phosphorus in its lowest oxidation state?
14.
Which of the following is used as rocket fuel?
15.
P₂O₅ heated with water gives:
17.
Which of the following is used as rocket fuel?
19.
In dilute aqueous solution, nitric acid exists as:
20.
Oxy acid forming hydride on heating:
21.
In which compound is phosphorus in its lowest oxidation state?
23.
“Pearl White” contains an element of VA group. The element used is:
24.
Oxidation number of Mn in MnO₄²⁻?
25.
NH₄Cl heated → vapors turn litmus blue then red because of:
26.
Property shared by white & red phosphorus:
27.
Iron with conc. HNO₃:
28.
Dinitrogen trioxide is:
29.
Which does NOT have N–N bond?
30.
The strongest reducing agent among the following is:
31.
Which is NOT a redox reaction?
32.
Little difference in acidic strengths of H₃PO₄, H₃PO₃, H₃PO₂ because:
33.
PCl₅ is possible but NCl₅ does not exist because:
34.
The molecular nitrogen is not reactive due to:
36.
N forms NCl₃ but P forms PCl₅ & PCl₃. Why?
37.
Red phosphorus is less reactive than yellow phosphorus because:
38.
A hydride of nitrogen which is acidic:
39.
Ammonia reacts with sodium hypochlorite to give:
40.
Oxy acid forming hydride on heating:
41.
The bonds present in N₂O₃ are:
42.
In dilute aqueous solution, nitric acid exists as:
43.
Dinitrogen trioxide is:
44.
Property shared by white & red phosphorus:
45.
Which of the following does not exhibit allotropy?
