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
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
C.
Al
From the given data, 3rd ionisation enthalpy is low, 4th ionsation enthalpy is very high. So, after removal of 3 electrons the element attains stability. Hence, its a trivalent element i.e Al.
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