Which one of the following is not true at room temperature and pressure?
P4O10 is white solid
SO2 is a colourless gas
SO3 is a colourless gas
NO2 is a brown gas
An element belongs to group 15 and third period of the Periodic Table. Its electronic configuration will be:
1s22s22p3
1s22s22p4
1s22s22p63s23p3
1s22s22p63s23p2
Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl?
MnO2
H2S
KMnO4
Cr2O3
Which of the following is a polar molecule?
BF3
SF4
SiF4
XeF4
B.
SF4
Symmetrical molecules are generally non-polar although they have polar bonds. This is because bond dipole of one bond is cancelled by that of the other. BF3, SiF4 and XeF4 being symmetrical as non-polar. SF4 is unsymmetrical because of the presence of a lone pair of electrons. Due to which it is a polar molecule.
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