which of the following represents the composition of carnallite mineral?
K2O.Al2O3.6SiO2
KNO3
K2SO4.MgSO4.MgCl2.6H2O
KCl.MgCl2.6H2O
The standard reduction potential Eo for half-reaction are:
Zn Zn2+ + 2e- ; E° = + 0.76V
Fe Fe2+ + 2e- ; E° = + 0.41 V
The EMF of the cell reaction
Fe2+ + Zn Zn2+ + Fe is :
- 0.35 V
+ 0.35 V
+ 1.17 V
- 1.17 V
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
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.
Platinum, palladium and iridium are called noble metals because:
Alfred Nobel discovered them
they are shining lustrous and pleasing to look at
they are found in native state
they are inert towards many common reagents
Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl?
MnO2
H2S
KMnO4
Cr2O3
A plot of ln K against 1/T (abscissa) is expected to be a straight line with an intercept on ordinate axis equal to:
R xSo