An element belongs to group 15 and third period of the Periodic Table. Its electronic configuration will be:
1s22s22p3
1s22s22p4
1s22s22p63s23p3
1s22s22p63s23p2
C.
1s22s22p63s23p3
General valence shell electronic configuration of group 15 elements is ns2np3 and for the third period n = 3. Thus, with electronic configuration 1s22s22p63s23p3 ,the element is phosphorus.
Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl?
MnO2
H2S
KMnO4
Cr2O3
Of the following acids the one which has the capability to form complex compound and also possesses oxidising and reducing properties is
HNO3
HNO2
HCOOH
HCN
Atoms in a P4 molecule of white phosphorus are arranged regularly in the following way
at the corners of a cube
at the corners of an octahedron
at the corners of a tetrahedron
at the centre and corners of a tetrahedron
Which one of the following pairs is obtained on heating ammonium dichromate?
N2 and H2O
N2O and H2O
NO2 and H2O
NO and NO2
When KI is added to acidified solution of sodium nitrite, then
NO gas is liberated and I2 is set free
N2 gas is liberated and HI is produced
N2O gas is liberated and I2 is set free
N2 gas is liberated and HOI is produced