CBSE
Consider the following reaction,
C6H5NO2 X Y + HCl
What is Y?
Acetanilide
Benzinilide
Azobenzene
Hydrazobenzene
The metal that produces red-violet colour in the non-luminous flame is
Ba
Ag
Rb
Pb
The most basic element is
fluorine
iodine
chlorine
bromine
Argon is used
in filling airships
to obtain low temperature
in high temperature welding
in radiotherapy for treatment of cancer
Which one of the following transition metal ions is diamagnetic?
Co2+
Ni2+
Cu2+
Zn2+
Which of the following is a wrong statement ? In a given period of the Periodic Table, the s-block element has, in general, a higher value of
electronegativity
atomic radius
ionisation energy
electron affinity
The correct order of decreasing first ionisation energy is
C > B > Be > Li
C > Be > B > Li
B > C > Be > Li
Be > Li > B > C
In long form of Periodic Table, the properties of the elements are a periodic function of their
atomic size
ionisation energy
atomic mass
atomic number
Which of the following configurations corresponds to element of highest ionisation energy?
1s2, 2s1
1s2, 2s2, 2p3
1s2, 2s2, 2p2
1s2, 2s2, 2p6, 3s1
The element which forms oxides in all oxidation states + 1 to + 5 is
nitrogen
phosphorus
arsenic
antimony