CBSE
Which of the following is not correct ?
Hydrolysis of NCl3 gives NH3 and HOCl
NH3 is less stable than PH3
NH3 is a weak reducing reagent compared to PH3
Nitric oxide in solid state exhibits diamagnetic property
In III group precipitation, NH4Cl is added before adding NH4OH to
decrease conc. of OH-
prevent interference of PO
increase conc. of Cl-
increase conc. of OH- ion
The most stable compound is
LiF
LiCl
LiBr
LiI
When copper reacts with hot and conc. H2SO4 gives
H2
N2
O2
SO2
BaO2 and ozone reacts to produce
Ba
Ba2O3
BaO
Ba(OH)3
The set representing the correct order for first ionisation potential is
K > Na > Li
Be > Mg > Ca
B > C > N
Ge > Si > C
A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three -particles in succession. The group of the periodic table to which the resulting daughter element would belong to
Group 14
Group 16
Group 4
Group 6
The first ionisation enthalpy of boron is less than beryllium because:
Boron has high nuclear charge
The size of boron atom is more than beryllium atom
p-subshell of boron has only one electron
The size cit boron atom is less than beryllium atom
What will be the order of Ist ionisation energy?
Li > Na > K
K > Li > Na
Na > Li > K
Li > K > Na
Which of the following statement(s) is/are correct regarding shielding effect?
The magnitude of screening effect do not depends upon the number of inner electrons
The magnitude of effective nuclear charge decreases in a period.
Greater the shielding effect, lower will be the atomic radii
For a given 'orbit' the shielding effect of electron belonging to different subshell decrease in the order s > p > d >f