The statement that is not correct is
Hypophosphorous acid reduces silver nitrate to silver
In solid state PCl5 exists as [PCl4]+ [PCl6]-
Pure phosphine is non-inflammable
Phosphorous acid on heating disproportionates to give metaphosphonic acid and phosphine
On heating with concentrated NaOH solution in an inert atmosphere of CO2 white phosphorus gives a gas. Which of the following statement is incorrect about the gas?
It is less basic than NH3
It is more basic than NH3
It is highly poisonous and has smell like rotten fish
Its solution in water decomposes in the presence of light
How many ions per molecule are produced in the solution, when Mohr salt is dissolved in excess of water?
4
5
6
10
The aqueous solution of following salt will have the lowest pH
NaClO3
NaClO
NaClO2
NaClO4
D.
NaClO4
The salts of strong acids give acidic solution (having pH less than 7).In the given salts, acid strength of oxoacids of chlorine increases with increase in oxidation number of chlorine.
Oxidation number (x) of Cl in HClO4 ( perchloric acid)
1+ x-8 = 0
x= +7
Oxidation number of Cl in HClO3 ( chloric acid)
1+ x-6 = 0
x= +5
Oxidation number of Cl in HClO2 (chlorous acid)
1+ x-4 = 0
x= +3
Oxidation number of Cl in HClO (hypochlorous acid)
1+x-2 =0
x= +1
So, acidic strength decreases in the order
( Most acidic)HClO4 > HClO3 > HClO2 > HClO(less acidic)
So, HClO4 is the strongest acid and salt of this aod NaClO4, will have the lowest pH
For one of the element various successive ionisation enthalpies (in kJ mol-1) are given below.
1st | 2nd | 3rd | 4th | 5th | |
IE | 5775 | 1810 | 2750 | 11,580 | 14820 |
The element is
Si
P
Al
Mg
The property which is not true about fluorine is
most of its reactions are exothermic
it forms only one oxo acid
highest electronegativity
high F-Fbond dissociation enthalpy
Which is true regarding nitrogen?
Less electronegative
Has low ionisation enthalpy
d-orbitals are available
Ability to form bonds with itself