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Which of the following order is correct for the first ionization energies of their elements?
Boron, B is smaller than beryllium, Be atom. Hence we expect increase in ionization energy from Be to B.
However, Be atom has greater ionization energy than B atom. The reason is - in case of Beryllium, the last electron is in the s-orbital and in Boron, the last electron is in the p-orbital. We know that removal of electron from s-orbital requires more energy than the electron from p-orbital.
2s22p3 configuration is more stable than 2s22p4 due to half filled p-sublevel. The electrons in the p-orbital in N atom experience less repulsion, thus more stable and more ionization energy. Whereas in case of O atom the 4th p-electron atom can be removed more easily as it experiences more repulsion from the electrons in the p-orbitals already present. Hence nitrogen, Oxygen atom has less ionization energy than Nitrogen atom.
The decreasing order of ionic nature of the following compound is:
The atomicity and the total number of bonds in the elemental white phosphorous molecule are respectively:
Which of the following reactions does not give H3PO3:
Explanation : Balanced Chemical Equation
P4O6 + H2O = H3PO4 + PH3
In a reaction, Na2S2O3 is converted to Na2S4O6. The equivalent weight of Na2S2O3 for this reaction is (mol. wt. of Na2S2O3 = M)
Among the following, the incorrect statement is:
Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure, as the potential energy due to intermolecular forces becomes less significant compared with the particles' kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them.
The number of P=O bonds present in the tetra basic acid H4P2O7 is:
The formal charges on the nitrogen atom from left to right in the azide anion, [N=N=N]– are:
At room temperature, HCl is a gas while HF is a liquid because:
P4O10 is the anhydride of
Phosphorus Pentoxide, Reagent, ACS is the anhydride of phosphoric acid and a powerful dehydrating and desiccant agent. It is used extensively in organic synthesis as a dehydrating agent.
Hydrolysis of (CH3)2 SiCl2 and CH3SiCl3 leads to:
Correct Answer :- a
Explanation : The silicon containing residual hydroxyl groups will be cross linked using boric acid and this tri functional acid, B(OH)3 groups, forms Si-O-B linkage between siloxane chains.